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10. Pathology and Oncology MCQs

Practice Set 69 of 351

This practice set contains high-yield board review questions covering key concepts in 10. Pathology and Oncology. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 1361

Topic: 10. Pathology and Oncology

Question 2

A 38-year-old patient presents with a 1.5 cm, ill-defined, deep-seated mass in the palm, causing intermittent pain and mild weakness in grip strength. On physical examination, the mass is firm and appears fixed to deeper structures. There is no transillumination. Plain radiographs are unremarkable. Given the diagnostic uncertainty and the mass's deep location and potential relationship to critical structures, which advanced imaging modality is considered the 'gold standard' for detailed soft tissue characterization, defining the extent of the lesion, and its relationship to critical neurovascular bundles and tendons?

. A. Computed Tomography (CT)
. B. Ultrasound (US)
. C. Magnetic Resonance Imaging (MRI)
. D. Arthrography
. E. Bone Scintigraphy

Correct Answer & Explanation

. C. Magnetic Resonance Imaging (MRI)

Explanation

Correct Answer: CThe case states that 'Magnetic Resonance Imaging (MRI): The gold standard for detailed soft tissue characterization, defining the extent of the lesion, and its relationship to critical structures. Superior for distinguishing between benign and malignant features (e.g., T1/T2 signal characteristics, enhancement patterns, presence of perilesional edema). Crucial for larger, deeper, or diagnostically challenging masses.' Given the deep, ill-defined nature and diagnostic uncertainty, MRI is the most appropriate choice.Option A (CT) is incorrect.CT is less frequently used for primary soft tissue masses unless bony involvement is a major concern. It provides less soft tissue detail than MRI.Option B (Ultrasound) is incorrect.While ultrasound is an excellent first-line advanced imaging for differentiating cystic from solid lesions and assessing neurovascular proximity, MRI offers superior detailed soft tissue characterization and is the gold standard for defining the full extent and relationship to critical structures, especially for deeper or diagnostically challenging masses.Option D (Arthrography) is incorrect.Arthrography is primarily used to evaluate joint pathology, particularly tears in ligaments or cartilage, and is not the primary imaging modality for characterizing a soft tissue mass.Option E (Bone Scintigraphy) is incorrect.Bone scintigraphy (bone scan) is used to detect increased metabolic activity in bone, such as infections, fractures, or tumors, but it does not provide detailed soft tissue characterization.

Question 1362

Topic: 10. Pathology and Oncology

Question 3

A 68-year-old patient presents with a rapidly growing, firm, and fixed mass on the ulnar side of the palm, which has developed over the past 3 months. The patient reports increasing pain and paresthesias in the small finger. MRI reveals a 3 cm mass with irregular borders, heterogeneous enhancement, and evidence of local infiltration into adjacent soft tissues. There is a high clinical suspicion for malignancy. Based on the case's guidelines for suspicious masses, what is the *most appropriate* next step in management?

. A. Immediate wide local excision to achieve clear margins.
. B. Observation with serial MRI scans every 3 months.
. C. Incisional biopsy performed by an experienced orthopedic oncologist or hand surgeon.
. D. Fine-needle aspiration (FNA) for definitive histological diagnosis.
. E. Referral for immediate radiation therapy without biopsy.

Correct Answer & Explanation

. C. Incisional biopsy performed by an experienced orthopedic oncologist or hand surgeon.

Explanation

Correct Answer: CThe case explicitly states: 'For highly suspicious masses (rapid growth, deep location, large size, concerning MRI features), an incisional biopsy (rather than initial wide local excision) performed by an experienced orthopedic oncologist or hand surgeon is often warranted. This allows for definitive histological diagnosis and appropriate oncologic staging before definitive wide resection, if malignancy is confirmed. A poorly performed excisional biopsy (especially 'wide') can compromise subsequent oncologic resection and limb salvage.'Option A is incorrect.Initial wide local excision is generally contraindicated as a diagnostic maneuver for a suspected malignancy in the hand, as it can compromise subsequent definitive oncologic resection and limb salvage if the diagnosis is confirmed.Option B is incorrect.Given the rapid growth, fixed nature, and concerning MRI features, observation is inappropriate and could delay critical treatment for a potential malignancy.Option D is incorrect.While FNA can be useful for cystic lesions or to confirm benignity, the case notes it 'has limitations in solid tumors' and for highly suspicious solid masses, an incisional biopsy provides more tissue for comprehensive histological analysis and definitive diagnosis.Option E is incorrect.Radiation therapy is a treatment modality, not a diagnostic step. Definitive histological diagnosis via biopsy is essential before initiating oncologic treatment.

Question 1363

Topic: 10. Pathology and Oncology

Question 5

A 40-year-old patient has undergone precise excision of a giant cell tumor of the tendon sheath (GCTTS) from the flexor tendon sheath of the index finger. The surgeon meticulously removed the tumor, ensuring complete en bloc excision while preserving the tendon and A2 pulley. Post-operatively, the patient is concerned about stiffness. Based on the rehabilitation protocols outlined in the case, what is the *most crucial* principle to prevent adhesions and optimize long-term function in this patient?

. A. Prolonged immobilization of the affected digit for 4-6 weeks to ensure complete healing.
. B. Aggressive strengthening exercises immediately after suture removal.
. C. Early, controlled active range of motion (AROM) exercises of the affected digit.
. D. Strict avoidance of any scar massage until 3 months post-surgery.
. E. High-dose opioid analgesics to completely eliminate all post-operative pain.

Correct Answer & Explanation

. C. Early, controlled active range of motion (AROM) exercises of the affected digit.

Explanation

Correct Answer: CThe case emphasizes: 'Early Mobilization: This is the most crucial principle in hand surgery to prevent adhesions and stiffness. Unless there is a specific reason for immobilization (e.g., tendon repair, joint instability), active range of motion (AROM) exercises are initiated as soon as pain allows, often within the first few days post-surgery.' For flexor tendon sheath excisions, it specifically states: 'Crucial to initiate early AROM of the affected digit to prevent flexor tendon adhesions and subsequent triggering or loss of motion.'Option A is incorrect.Prolonged immobilization is generally detrimental in hand surgery, leading to stiffness and adhesions, especially after flexor tendon sheath surgery where tendon glide is critical.Option B is incorrect.While strengthening is part of rehabilitation, it is introduced gradually, typically after 3-4 weeks, once initial healing is sufficient and ROM goals are met. Immediate aggressive strengthening could jeopardize healing.Option D is incorrect.Scar management, including gentle scar massage, is recommended once sutures are removed and the wound is fully closed to improve pliability and prevent adhesions.Option E is incorrect.While adequate pain management is vital, the goal is to control pain to allow participation in therapy, not necessarily to eliminate all pain with high-dose opioids, which carry their own risks.

Question 1364

Topic: 10. Pathology and Oncology

Question 6

A 28-year-old patient presents with a recurrent dorsal wrist ganglion 8 months after undergoing surgical excision. The patient reports that the mass reappeared in the same location and is now causing similar intermittent discomfort. During the initial surgery, the ganglion was excised, but the patient is unsure if the stalk was completely removed. Based on the case, what is the approximate recurrence rate for dorsal wrist ganglions after surgical excision, and what is a common reason for this recurrence?

. A. Less than 5%, typically due to post-operative infection.
. B. 5-10%, often related to inadequate post-operative immobilization.
. C. 10-30%, frequently due to incomplete excision of the stalk or underlying wrist joint pathology.
. D. 30-50%, primarily caused by patient non-compliance with rehabilitation.
. E. Greater than 50%, indicating a high likelihood of malignant transformation.

Correct Answer & Explanation

. C. 10-30%, frequently due to incomplete excision of the stalk or underlying wrist joint pathology.

Explanation

Correct Answer: CThe case states under 'Complications & Management' that 'Ganglion cysts (especially dorsal wrist) have a recurrence rate of 10-30%, often due to incomplete excision of the stalk or underlying wrist joint pathology.' It further reinforces this in the 'Summary of Key Literature / Guidelines' section.Option A is incorrect.The recurrence rate is higher than 5%, and infection is a separate complication, not the primary cause of recurrence for ganglions.Option B is incorrect.While immobilization can cause stiffness, it is not the primary reason for ganglion recurrence, and the recurrence rate is higher than 5-10%.Option D is incorrect.The recurrence rate is not typically as high as 30-50%, and while patient compliance is important for overall outcome, it's not cited as the primary reason for ganglion recurrence.Option E is incorrect.Ganglion cysts are benign. Recurrence does not indicate malignant transformation.

Question 1365

Topic: 10. Pathology and Oncology

Question 7

A 60-year-old patient is undergoing excision of a giant cell tumor of the tendon sheath (GCTTS) located in the palm, intimately associated with the digital neurovascular bundle and flexor tendon. The surgeon is aware of the high recurrence rate of GCTTS if incompletely removed. Based on the detailed surgical approach described in the case, what is the *most critical* aspect of the surgical technique for GCTTS excision to minimize recurrence while preserving function?

. A. Performing a wide local excision with 1 cm margins of healthy tissue around the tumor.
. B. Using blunt dissection exclusively to avoid injury to adjacent structures.
. C. Achieving complete en bloc excision of the tumor with meticulous separation from adjacent neurovascular structures and tendon fibers.
. D. Leaving a small portion of the tumor if it is too adherent to a nerve fascicle to avoid nerve injury.
. E. Administering immediate post-operative radiation therapy to the surgical site.

Correct Answer & Explanation

. C. Achieving complete en bloc excision of the tumor with meticulous separation from adjacent neurovascular structures and tendon fibers.

Explanation

Correct Answer: CThe case states under 'Specific Techniques for Common Hand Masses' for GCTTS: 'Complete en bloc excision is critical to minimize recurrence. Care must be taken to avoid stripping the healthy tendon surface, which can lead to adhesions. If the tumor infiltrates a nerve fascicle, a decision must be made whether to resect the involved fascicle or carefully debulk. Nerve resection should be avoided if possible.' It also notes: 'The literature consistently emphasizes that the primary risk factor for recurrence is incomplete excision. Given the lobulated and often infiltrative nature of GCTTS, meticulous dissection and complete removal... are critical.'Option A is incorrect.The case explicitly states: 'There is no role for wide local excision with substantial normal tissue margins for GCTTS; the goal is tumor-free margins immediately adjacent to the lesion.' WLE would cause unacceptable morbidity in the hand.Option B is incorrect.While judicious blunt dissection can be used, the case recommends 'Sharp Dissection: Use a sharp scalpel or fine scissors for tissue separation. Blunt dissection should be used judiciously, particularly near critical structures, as it can cause traction injury to nerves.' Meticulous sharp dissection is often necessary.Option D is incorrect.Leaving a portion of the tumor, especially if it's infiltrative, is a primary cause of recurrence for GCTTS. While nerve preservation is paramount, the goal is complete removal, often requiring careful debulking around nerves rather than leaving gross tumor.Option E is incorrect.Post-operative radiation therapy is not a standard or immediate treatment for benign GCTTS and is not mentioned as a primary strategy to prevent recurrence in the case.

Question 1366

Topic: 10. Pathology and Oncology

Question 10

A 30-year-old patient presents with a 1 cm, soft, mobile, non-tender subcutaneous mass in the thenar eminence. The mass has been present for several years and has not changed in size or caused any symptoms. Physical examination confirms a classic presentation of a benign lipoma. The patient is otherwise healthy and has no significant medical comorbidities. Based on the indications and contraindications for hand mass excision outlined in the case, what is the *most appropriate* initial management strategy for this patient?

. A. Immediate surgical excision due to the presence of a mass.
. B. Incisional biopsy to rule out malignancy.
. C. Observation, as the mass is asymptomatic and clearly benign.
. D. Wide local excision to prevent future growth or malignant transformation.
. E. Aspiration of the mass to confirm its cystic nature.

Correct Answer & Explanation

. C. Observation, as the mass is asymptomatic and clearly benign.

Explanation

Correct Answer: CThe case clearly outlines 'Non-Operative Indications / Contraindications for Excision,' stating: 'Asymptomatic Mass: The vast majority of benign hand masses are asymptomatic. If the patient has no pain, functional impairment, or significant cosmetic concern, observation is the preferred initial management. Many benign masses (e.g., ganglion cysts) may spontaneously resolve or remain stable.' It also lists 'Clear Benign Diagnosis: If the diagnosis is unequivocally benign through clinical assessment and imaging (e.g., a classic dorsal wrist ganglion, a subcutaneous lipoma that is soft and mobile, an epidermal inclusion cyst with characteristic features) and the mass is asymptomatic or minimally symptomatic' as a non-operative indication.Option A is incorrect.Immediate surgical excision is not indicated for an asymptomatic, clearly benign mass.Option B is incorrect.An incisional biopsy is reserved for suspicious masses where malignancy is a concern. For a classic, asymptomatic lipoma, it is unnecessary.Option D is incorrect.Wide local excision is generally detrimental for benign hand masses and is not indicated for an asymptomatic lipoma. Lipomas do not undergo malignant transformation.Option E is incorrect.Lipomas are solid, fatty tumors, not cystic. Aspiration would not confirm a cystic nature and is not the appropriate diagnostic or management step for a solid, benign, asymptomatic lipoma.

Question 1367

Topic: 10. Pathology and Oncology

A 42-year-old woman presents with a slow-growing, painless mass on the volar aspect of her right index finger. Excisional biopsy is performed. Histopathologic examination reveals a lobulated proliferation of mononuclear cells, multinucleated giant cells, and lipid-laden macrophages with hemosiderin deposition. What is the most likely diagnosis?

. Epidermal inclusion cyst
. Ganglion cyst
. Glomus tumor
. Giant cell tumor of the tendon sheath
. Schwannoma

Correct Answer & Explanation

. Giant cell tumor of the tendon sheath

Explanation

Giant cell tumor of the tendon sheath (nodular tenosynovitis) is the second most common soft tissue mass of the hand. It is characterized histologically by multinucleated giant cells, hemosiderin-laden macrophages, and foam cells.

Question 1368

Topic: 10. Pathology and Oncology

A 29-year-old woman complains of excruciating, paroxysmal pain in her left ring fingertip. She reports severe cold intolerance in the digit. Examination reveals a subtle bluish discoloration beneath the nail plate. Point tenderness is exquisitely localized using the head of a pin (Love's test). What is the most likely diagnosis?

. Mucous cyst
. Glomus tumor
. Subungual melanoma
. Enchondroma
. Pyogenic granuloma

Correct Answer & Explanation

. Glomus tumor

Explanation

A glomus tumor classically presents with the triad of severe paroxysmal pain, cold intolerance, and pinpoint tenderness (Love's pin test). It is a benign vascular hamartoma arising from the neuromyoarterial glomus body.

Question 1369

Topic: 10. Pathology and Oncology

A 45-year-old carpenter develops a firm, subcutaneous mass on the volar aspect of his left thumb. He recalls a puncture wound to the same area several years prior. Excision reveals a cyst filled with cheesy, malodorous material. Histology shows a wall composed of stratified squamous epithelium. What is the diagnosis?

. Foreign body granuloma
. Epidermal inclusion cyst
. Mucous cyst
. Giant cell tumor of tendon sheath
. Fibroma

Correct Answer & Explanation

. Epidermal inclusion cyst

Explanation

Epidermal inclusion cysts occur when penetrating trauma drives surface epithelium into the subcutaneous tissue. The trapped cells continue to produce keratin, forming a cyst lined by stratified squamous epithelium.

Question 1370

Topic: 10. Pathology and Oncology

During excision of a slow-growing, painful mass in the volar forearm of a 40-year-old man, the surgeon notes the tumor is eccentrically located on the median nerve. The mass is successfully dissected and 'shelled out' while completely preserving the continuity of the nerve fascicles. What is the most likely diagnosis?

. Neurofibroma
. Schwannoma
. Malignant peripheral nerve sheath tumor
. Lipoma
. Intraneural ganglion cyst

Correct Answer & Explanation

. Schwannoma

Explanation

Schwannomas (neurilemomas) are benign peripheral nerve tumors that grow eccentrically from the nerve and push fascicles to the periphery, allowing them to be carefully enucleated. In contrast, neurofibromas are intimately intertwined with the nerve fascicles and cannot typically be excised without sacrificing nerve function.

Question 1371

Topic: 10. Pathology and Oncology

A 35-year-old female presents with exquisite pain at the nail bed of her left index finger. She notes severe cold intolerance and pinpoint tenderness over the lunula. Love's pin test and Hildreth's test are positive. What is the most likely diagnosis?

. Enchondroma
. Giant cell tumor of the tendon sheath
. Glomus tumor
. Epidermal inclusion cyst
. Mucous cyst

Correct Answer & Explanation

. Glomus tumor

Explanation

A glomus tumor is a benign hamartoma of the glomus body, classically presenting with the triad of severe pain, pinpoint tenderness, and cold intolerance. Hildreth's test (relief of pain with tourniquet ischemia) is highly specific for this lesion.

Question 1372

Topic: 10. Pathology and Oncology

A 45-year-old man notes a slowly enlarging, painless, firm mass on the volar aspect of his right middle finger. Excisional biopsy is performed. Histopathology reveals a lobulated lesion with multinucleated giant cells, foamy macrophages, and prominent hemosiderin deposition. What is the diagnosis?

. Fibroma of the tendon sheath
. Giant cell tumor of the tendon sheath
. Schwannoma
. Lipoma
. Rheumatoid nodule

Correct Answer & Explanation

. Giant cell tumor of the tendon sheath

Explanation

Giant cell tumor of the tendon sheath is the second most common tumor of the hand (after ganglion cysts). Histologically, it is characterized by multinucleated giant cells and hemosiderin-laden macrophages.

Question 1373

Topic: 10. Pathology and Oncology

A 40-year-old presents with a volar forearm mass. Tinel's sign is positive over the mass. During surgical excision, the mass is noted to be eccentric, encapsulated, and easily separable from the main nerve fascicles. What is the most likely diagnosis?

. Neurofibroma
. Schwannoma
. Ganglion cyst
. Lipoma
. Malignant peripheral nerve sheath tumor

Correct Answer & Explanation

. Schwannoma

Explanation

Schwannomas are the most common benign peripheral nerve sheath tumors. They typically present as eccentric, encapsulated masses that displace the nerve fascicles, allowing them to be enucleated without sacrificing the nerve.

Question 1374

Topic: 10. Pathology and Oncology

A 35-year-old tailor presents with a painless, firm mass at the tip of his left thumb. He recalls a penetrating injury with a needle at the same site approximately a year ago. Histopathology shows a sac lined by stratified squamous epithelium filled with laminated keratin. What is the diagnosis?

. Glomus tumor
. Epidermal inclusion cyst
. Giant cell tumor of tendon sheath
. Foreign body granuloma
. Enchondroma

Correct Answer & Explanation

. Epidermal inclusion cyst

Explanation

Epidermal inclusion cysts often occur in the hand following a penetrating injury that drives epidermal cells into the deep tissues. These cells proliferate and produce keratin, forming a firm, cystic mass lined by stratified squamous epithelium.

Question 1375

Topic: 10. Pathology and Oncology

A 42-year-old woman complains of excruciating, pinpoint pain at the tip of her left index finger. She notes that the pain is severely exacerbated by cold weather. On examination, she is exquisitely tender at the nail bed, but the pain is entirely relieved when a tourniquet is applied to the base of the digit. What is the most likely diagnosis?

. Epidermal inclusion cyst
. Mucous cyst
. Glomus tumor
. Enchondroma
. Schwannoma

Correct Answer & Explanation

. Glomus tumor

Explanation

A glomus tumor classically presents with the triad of cold sensitivity, severe pinpoint pain, and subungual location. Hildreth's sign (relief of pain with a proximal tourniquet) is highly specific for this diagnosis.

Question 1376

Topic: 10. Pathology and Oncology

A 50-year-old man presents with a firm, painless, slow-growing mass on the volar aspect of his right index finger proximal interphalangeal (PIP) joint. Excisional biopsy is performed. Histopathologic analysis demonstrates multinucleated giant cells, histiocytes, and extensive hemosiderin deposition. What is the diagnosis?

. Ganglion cyst
. Giant cell tumor of tendon sheath
. Epidermal inclusion cyst
. Fibroma of tendon sheath
. Nodular fasciitis

Correct Answer & Explanation

. Giant cell tumor of tendon sheath

Explanation

Giant cell tumor of the tendon sheath is the second most common mass in the hand and typically occurs on the volar aspect of the digits. Histologically, it is characterized by multinucleated giant cells, foamy macrophages, and hemosiderin deposition.

Question 1377

Topic: 10. Pathology and Oncology

A 38-year-old tailor presents with a painless, firm, superficial mass on the palmar tip of his left index finger. He recalls a deep penetrating needle prick injury at that exact location 3 years ago. Surgical excision reveals a well-encapsulated sac filled with a white, cheesy material. What is the most likely diagnosis?

. Mucous cyst
. Epidermal inclusion cyst
. Schwannoma
. Glomus tumor
. Giant cell tumor of tendon sheath

Correct Answer & Explanation

. Epidermal inclusion cyst

Explanation

Epidermal inclusion cysts of the hand classically occur after penetrating trauma drives surface epithelium into the subcutaneous tissues. They grow slowly and are filled with a thick, white, cheesy material consisting of keratin.

Question 1378

Topic: 10. Pathology and Oncology

A 45-year-old male presents with a slowly enlarging, painful mass in his volar forearm. Exam reveals a strongly positive Tinel's sign over the mass. Intraoperatively, the mass is found to be eccentric to the median nerve and is enucleated smoothly without disrupting the parent nerve fascicles. Which of the following histologic findings is characteristic of this tumor?

. Antoni A and Antoni B areas
. Spindle cells thoroughly intertwined with normal nerve fibers
. Multinucleated giant cells and hemosiderin
. Keratinous debris with a squamous epithelial lining
. Vascular channels surrounded by uniform, rounded cells

Correct Answer & Explanation

. Antoni A and Antoni B areas

Explanation

The mass is a schwannoma, which is characteristically eccentric, encapsulated, and can be enucleated while preserving nerve fascicles. Histologically, schwannomas are defined by biphasic cellularity featuring dense Antoni A areas (Verocay bodies) and loose Antoni B areas.

Question 1379

Topic: 10. Pathology and Oncology

A 45-year-old woman presents with a slow-growing, painless, firm, multilobulated mass on the volar aspect of her right index finger. Radiographs show soft tissue swelling but no bony involvement. MRI demonstrates a lobulated mass with decreased signal intensity on both T1- and T2-weighted images. Histology shows multinucleated giant cells and hemosiderin-laden macrophages. What is the most likely diagnosis and optimal treatment?

. Ganglion cyst; treated with needle aspiration and corticosteroid injection
. Epidermal inclusion cyst; treated with marginal excision
. Giant cell tumor of the tendon sheath; treated with marginal excision
. Glomus tumor; treated with wide local excision
. Schwannoma; treated with marginal enucleation

Correct Answer & Explanation

. Giant cell tumor of the tendon sheath; treated with marginal excision

Explanation

The clinical presentation, dark MRI signal on T1 and T2 (due to hemosiderin), and histology are classic for a Giant Cell Tumor of the Tendon Sheath (GCTTS). Marginal excision is the definitive treatment, though patients should be counseled on the high rate of local recurrence.

Question 1380

Topic: 10. Pathology and Oncology

A 35-year-old woman presents with severe, cold-intolerant, pinpoint pain under her left index fingernail. Examination reveals a faint bluish discoloration beneath the nail plate and exquisite tenderness when pressure is applied with a pinhead (positive Love's test). The tumor responsible for this presentation originates from which of the following cell types?

. Schwann cells
. Fibroblasts of the nail bed
. Smooth muscle cells of the neuromyoarterial body
. Synovial cells of the distal interphalangeal joint
. Endothelial cells of the lymphatic vessels

Correct Answer & Explanation

. Smooth muscle cells of the neuromyoarterial body

Explanation

The patient has a glomus tumor, characterized by the classic triad of pinpoint pain, cold sensitivity, and severe tenderness. These tumors originate from the modified smooth muscle cells (glomus cells) of the neuromyoarterial glomus body, which is responsible for thermoregulation.

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