Bone Tumors Practice Questions

Q: A 20-year-old male presents with a painful mass on his distal femur. X-rays reveal a sclerotic lesion with a central nidus. What is the most likely diagnosis?

Osteoid Osteoma. ***Osteoid Osteoma*** - A **sclerotic lesion with a central nidus** on X-ray is the classic radiographic finding for an **osteoid osteoma**. The nidus is the metabolically active, pain-producing area. - This benign bone tumor typically causes **nocturnal pain** that is relieved by **NSAIDs**, commonly presenting in young males in their 20s. *Osteosarcoma* - While osteosarcoma is a malignant bone tumor that can affect the distal femur, it typically presents with a more **aggressive lytic and blastic lesion** with ill-defined margins and a sunburst or Codman's triangle appearance, not a discrete sclerotic lesion with a central nidus. - It usually causes more severe, persistent pain that is not relieved by NSAIDs, often associated with a **palpable mass** and systemic symptoms. *Chondroblastoma* - Chondroblastoma is a benign cartilaginous tumor often found in the **epiphysis of long bones** (like the distal femur) in skeletally immature individuals. - Radiographically, it usually appears as a **lytic lesion** with a sclerotic rim and sometimes chondroid matrix calcifications, rather than a dense sclerotic lesion with a central nidus. *Ewing's Sarcoma* - Ewing's sarcoma is a highly malignant bone tumor predominantly affecting children and young adults, often involving the **diaphysis of long bones**. - X-rays typically show a **destructive lytic lesion** with an "onion skin" periosteal reaction due to layers of new bone formation, which is distinct from a sclerotic lesion with a central nidus.

Q: A 33-year-old female presents with a slow-growing bony mass along the distal femur cortex in the metaphyseal region, with an appreciable gap between the cortex and tumor without any cortical invasion. What is the usual treatment for this condition?

Local resection. **Local resection** * The patient's presentation of a **slow-growing bony mass** on the distal femur, specifically in the **metaphyseal region** with an **appreciable gap between the cortex and tumor** (suggesting a lesion like an osteochondroma or osteoma), is characteristic of a benign bone tumor. * For such benign, usually asymptomatic lesions, **local resection** is the standard treatment to remove the mass and prevent potential complications like irritation, fracture, or malignant transformation, especially if it becomes symptomatic or grows significantly. *Amputation* * **Amputation** is a radical procedure usually reserved for aggressive malignancies or severe, unreconstructable trauma. * Given the description of a **slow-growing, non-invasive bony mass**, amputation would be an **overly aggressive and inappropriate** treatment with significant morbidity. *Chemotherapy* * **Chemotherapy** is a systemic treatment primarily used for **malignant tumors**, especially those with metastatic potential or high rates of recurrence. * The described lesion is characteristic of a **benign bone tumor**, for which chemotherapy offers no benefit and carries significant side effects. *Radiotherapy* * **Radiotherapy** uses high-energy radiation to destroy cancer cells and is primarily used for **malignant tumors**, either as primary treatment, adjuvant therapy, or palliative care. * It is generally **not indicated for benign bone lesions** due to the risk of radiation-induced complications, including potential malignant transformation in rare cases, especially when surgical excision is curative.

Q: What is the most common lesion associated with pathological fractures in the hand?

Enchondroma. ***Enchondroma*** - **Enchondromas** are benign cartilaginous tumors that are the most common cause of **pathological fractures** in the bones of the hand. - They frequently occur in the **phalanges** and **metacarpals**, weakening the bone and predisposing it to fracture with minimal trauma. *Metastases* - While metastases can cause pathological fractures, they are **rarely found** in the bones of the hand. - The most common sites for bone metastases are the **spine, pelvis, ribs, and proximal long bones**. *Osteoid osteoma* - **Osteoid osteoma** is a benign bone tumor known for causing **nocturnal pain** that is relieved by aspirin. - It typically causes **localized pain** and a small **nidus** surrounded by reactive bone sclerosis, but it is not a common cause of pathological fractures in the hand. *Osteochondroma* - **Osteochondroma** is a benign bone tumor that grows on the **external surface of bones** near growth plates. - While it can cause pain or fracture through its stalk, it generally does not cause **intramedullary weakness** leading to pathological fractures of the bone shaft itself in the hand.

Q: Which of the following is an intramedullary tumor?

Ewing sarcoma. ***Ewing sarcoma*** - **Ewing sarcoma** is a highly malignant tumor originating from primitive neuroectodermal cells in the bone marrow, thus qualifying as an **intramedullary tumor**. - It characteristically presents with an **"onion-skin" appearance** on X-rays due to reactive new bone formation in layers. *Chondrosarcoma* - **Chondrosarcoma** is a malignant tumor of cartilage-forming cells, typically arising from pre-existing cartilaginous lesions or de novo. - While it can be found in bone, its origin is primarily cartilaginous and often **juxtacortical** or central, rather than exclusively intramedullary. *Osteochondroma* - An **osteochondroma** is a benign bone tumor characterized by an outgrowth of bone with a cartilaginous cap. - It is an **exostosis**, meaning it grows outward from the surface of the bone, and is not an intramedullary lesion. *Parosteal osteosarcoma* - **Parosteal osteosarcoma** is a low-grade osteosarcoma that arises from the **outer surface of the bone** (periosteum). - It is a **surface osteosarcoma** located on the external cortex of the bone, as opposed to within the medullary cavity.

Q: Most common primary bone tumour of hand is:

Enchondroma. ***Enchondroma*** - **Enchondromas** are the most common **benign primary bone tumor of the hand**, frequently affecting the **phalanges** and **metacarpals**. - They are typically asymptomatic but can present with pathological fractures or be incidentally found on imaging. *Osteoma* - **Osteomas** are benign bone growths usually found in the **craniofacial bones**, not typically presenting in the hand. - They are slow-growing, **dense bone lesions** that are generally asymptomatic. *Osteochondroma* - **Osteochondromas** are the most common benign bone tumors overall, but they typically arise from the **metaphysis of long bones**, such as the femur or tibia. - They are **cartilage-capped bony projections** from the external surface of bone, and while they can occur in the hand, they are less common than enchondromas there. *No other options are correct* - This statement is incorrect because **Enchondroma** is the most common primary bone tumor of the hand.

Q: Which of the following statements about aneurysmal bone cyst is false?

Treated by simple curettage. ***Treated by simple curettage*** - Aneurysmal bone cysts (ABCs) have a high recurrence rate with **simple curettage** alone due to their aggressive nature and tendency to bleed. - More extensive treatment options like **extended curettage**, chemical cauterization with **phenol**, cryotherapy, or sometimes even resection are often necessary to prevent recurrence. *Eccentric* - ABCs are typically **eccentric** in their location within the bone, meaning they often arise on one side of the bone rather than centrally. - This eccentric growth pattern is a characteristic radiologic feature that helps differentiate them from other bone lesions. *Expansile & lytic* - ABCs are characteristically **expansile**, causing the bone cortex to thin and balloon out, and are **lytic**, meaning they destroy bone tissue. - Radiographically, this presents as a **bubbly appearance** with visible fluid-fluid levels on MRI, reflecting blood-filled cavities. *Metaphysis of long bones* - Aneurysmal bone cysts commonly occur in the **metaphysis of long bones**, such as the femur and tibia. - While they can affect any bone, this metaphyseal location, particularly in young individuals, is a frequent presentation.

Q: In the context of bone metastasis, which of the following bones is least likely to be a site of metastasis?

Fibula. ***Fibula*** - The **fibula** is not commonly involved in **metastatic disease**, primarily due to its low blood supply compared to other bones. - While it can occasionally show metastatic lesions, it's **rare** when compared to more commonly affected sites. *Humerus* - The **humerus** can be affected by metastasis, often from lung or breast cancers [1], as it is one of the long bones involved in **hematogenous spread**. - Common presentations include **lytic or blastic lesions**, which indicate bone damage from metastatic processes. *Femur* - The **femur** is frequently involved in metastatic lesions, particularly in patients with malignancies like **prostate or breast cancer** [1]. - Symptoms may include **pain** and **pathologic fractures** due to the weakening of the bone structure from metastasis [1]. *Spine* - The **spine** is a common site for metastases, especially from cancers such as **lung, breast, and prostate** [1]. - Bone scans often reveal **vertebral body lesions**, leading to complications like **spinal cord compression** [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 674-675.

Q: Which of the following bone tumors characteristically presents with nocturnal pain relieved by NSAIDs and shows a radiolucent nidus surrounded by sclerotic bone?

Osteoid osteoma. ***Osteoid osteoma*** - This benign bone tumor is characterized by **nocturnal pain** that is typically **relieved by NSAIDs**, a highly distinctive clinical feature due to prostaglandin production within the nidus. - Radiographically, it presents as a small **radiolucent nidus** (less than 1.5 cm) surrounded by a significant margin of **sclerotic bone**. *Chondrosarcoma* - This is a **malignant cartilage-forming tumor** that usually presents with a dull, aching pain that is often **not relieved by NSAIDs** and may worsen over time. - Radiographically, it appears as a **large, destructive lesion with calcifications**, not a small nidus with surrounding sclerosis. *Enchondroma* - An enchondroma is a **benign cartilaginous tumor** that is typically found in the medullary cavity of long bones, often in the small bones of the hands and feet. - It is usually **asymptomatic** and discovered incidentally, and on imaging, it appears as a **well-circumscribed lytic lesion** without the prominent sclerotic rim or specific nocturnal pain pattern seen in osteoid osteoma. *None of the options* - This option is incorrect because **osteoid osteoma** perfectly matches the clinical and radiographic description provided in the question.

Q: Osteoclastoma arises from which part of the bone?

Metaphysis. ***Metaphysis*** - **Osteoclastoma**, also known as a **Giant Cell Tumor of Bone (GCTB)**, classically originates in the **metaphysis** of long bones. - It then often extends into the **epiphysis**, near the articular cartilage, particularly after epiphyseal plate closure. *Epiphysis* - While GCTB can expand into the **epiphysis**, its primary origin is the **metaphysis**. - Tumors primarily arising in the epiphysis are less common for GCTB, though they can eventually involve this region. *Diaphysis* - The **diaphysis** (bone shaft) is an uncommon site for osteoclastoma origin. - Other bone tumors, such as **Ewing sarcoma** or **adamantinoma**, are more characteristic of diaphyseal locations. *None of the options* - This option is incorrect as **metaphysis** is indeed the correct primary site of origin for osteoclastoma. - The distinct location helps differentiate it from other bone lesions.

Q: Osteochondroma arises from which part of the bone?

Metaphysis. ***Metaphysis*** - **Osteochondromas** are outgrowths of bone and cartilage that typically arise from the **metaphyseal regions** of long bones, such as the distal femur, proximal tibia, and proximal humerus. - This region is characterized by active **endochondral ossification**, which is the process interrupted in the formation of ostecochondromas. *Medullary cavity* - The **medullary cavity** contains bone marrow and is not the primary site of origin for osteochondromas, which are exophytic lesions. - While some tumors can extend into the medullary cavity, their origin is generally from the outer bone surfaces rather than the central cavity. *Diaphysis* - The **diaphysis** is the main or mid-section of a long bone (the shaft), and it is primarily composed of compact bone, with less active growth than the metaphysis. - Though osteochondromas can occur in the diaphysis, they are far less common than in the metaphysis, which is the site of rapid bone growth. *Epiphysis* - The **epiphysis** is the end part of a long bone, initially separated from the main bone by cartilage but later fusing with it. - While it's a site of growth, osteochondromas are very rarely found in the epiphysis, as their growth mechanism is more closely linked to the **physeal plate** located in the metaphysis.

Question 1

A 20-year-old male presents with a painful mass on his distal femur. X-rays reveal a sclerotic lesion with a central nidus. What is the most likely diagnosis?

Accepted Answer

Osteoid Osteoma

Answer

Osteosarcoma

Answer

Chondroblastoma

Answer

Ewing's Sarcoma

Question 2

A 33-year-old female presents with a slow-growing bony mass along the distal femur cortex in the metaphyseal region, with an appreciable gap between the cortex and tumor without any cortical invasion. What is the usual treatment for this condition?

Accepted Answer

Local resection

Answer

Chemotherapy

Answer

Radiotherapy

Answer

Amputation

Question 3

What is the most common lesion associated with pathological fractures in the hand?

Accepted Answer

Enchondroma

Answer

Metastases

Answer

Osteoid osteoma

Answer

Osteochondroma

Question 4

Which of the following is an intramedullary tumor?

Accepted Answer

Ewing sarcoma

Answer

Chondrosarcoma

Answer

Osteochondroma

Answer

Parosteal osteosarcoma

Question 5

Most common primary bone tumour of hand is:

Accepted Answer

Enchondroma

Answer

Osteoma

Answer

Osteochondroma

Answer

No other options are correct

Question 6

Which of the following statements about aneurysmal bone cyst is false?

Accepted Answer

Treated by simple curettage

Answer

Eccentric

Answer

Expansile & lytic

Answer

Metaphysis of long bones

Question 7

In the context of bone metastasis, which of the following bones is least likely to be a site of metastasis?

Accepted Answer

Fibula

Answer

Femur

Answer

Humerus

Answer

Spine

Question 8

Which of the following bone tumors characteristically presents with nocturnal pain relieved by NSAIDs and shows a radiolucent nidus surrounded by sclerotic bone?

Accepted Answer

Osteoid osteoma

Answer

Chondrosarcoma

Answer

Enchondroma

Answer

None of the options

Question 9

Osteoclastoma arises from which part of the bone?

Accepted Answer

Metaphysis

Answer

Diaphysis

Answer

Epiphysis

Answer

None of the options

Question 10

Osteochondroma arises from which part of the bone?

Accepted Answer

Metaphysis

Answer

Medullary cavity

Answer

Diaphysis

Answer

Epiphysis

Bone Tumors — MCQs

Bone Tumors — MCQs

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