Bone Tumors Practice Questions

Q: A 35-year-old woman presents with a painless mass on her hand. An X-ray shows a well-defined, non-sclerotic lytic lesion. What is the most likely diagnosis?

Enchondroma. ***Enchondroma*** - A **painless mass on the hand** with a **well-defined, non-sclerotic lytic lesion** on X-ray is highly characteristic of an enchondroma. These are benign cartilaginous tumors common in the small bones of the hands and feet. - Enchondromas typically present in **young adults** and are often discovered incidentally or due to a pathological fracture, given their asymptomatic nature. *Giant Cell Tumor* - Giant cell tumors are typically found in the **epiphysis and metaphysis of long bones** (e.g., distal femur, proximal tibia), not as commonly in the small bones of the hand. - While they can be lytic, they often present with more aggressive features, potentially causing **pain and joint dysfunction**, and have a higher recurrence rate. *Chondroblastoma* - Chondroblastomas are rare cartilaginous tumors usually found in the **epiphysis of long bones** in teenagers and young adults, such as the humerus or femur. - They tend to cause **pain and swelling** around the affected joint, which differs from the painless presentation here. *Osteochondroma* - Osteochondromas are **exostoses**, meaning they are bone outgrowths covered by cartilage, presenting as a palpable bony lump. - X-rays would show a **bony projection** continuous with the cortex of the underlying bone, not a lytic lesion within the bone.

Q: Which bone cyst is most commonly associated with the proximal humerus in children?

Unicameral bone cyst. ***Unicameral bone cyst*** - **Unicameral bone cysts (UBCs)** are benign, fluid-filled lesions most commonly found in the **metaphysis of long bones** in children, particularly the **proximal humerus** and femur. - They are often asymptomatic until a pathological fracture occurs, which is a common presentation. *Aneurysmal bone cyst* - While an **aneurysmal bone cyst (ABC)** can occur in the humerus, it is less common than a UBC in the proximal humerus in children. - ABCs are typically expansile, blood-filled lesions that can arise in any bone, often presenting with pain and swelling. *Osteoid osteoma* - An **osteoid osteoma** is a benign bone tumor characterized by a small nidus that causes **severe nocturnal pain relieved by NSAIDs**. - It is more commonly found in the **diaphysis of long bones** or posterior elements of the spine and is not primarily associated with the proximal humerus in children as a cyst. *Chondroblastoma* - A **chondroblastoma** is a rare, benign cartilaginous tumor that typically affects the **epiphysis of long bones** in adolescents and young adults. - While it can occur in the proximal humerus, it's an epiphyseal lesion, and less common than a UBC which preferentially affects the metaphysis.

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: 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 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: 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 is the commonest true benign bone neoplasm?

Osteoid osteoma. ***Osteoid osteoma*** - This is one of the most frequently encountered **true benign bone neoplasms**, characterized radiographically by a **nidus** surrounded by sclerotic bone. - It commonly presents with **nocturnal pain** relieved by NSAIDs, often affecting long bones and the posterior elements of the spine. *Hemangioma* - While relatively common, particularly in the **vertebral bodies** and skull, hemangiomas are vascular malformations rather than true primary bone-forming tumors. - They are often asymptomatic and discovered incidentally, appearing as a **"corduroy cloth" pattern** on imaging in the spine. *Osteochondroma* - This is the **most common benign bone tumor overall**, but it is a **cartilage-capped bony exostosis** arising from the external surface of a bone, not a true neoplasm originating within the bone matrix itself. - It is typically found near **growth plates** and can be solitary or multiple (hereditary multiple exostoses). *Enchondroma* - Enchondromas are common **cartilaginous neoplasms** found intramedullary, primarily in the small bones of the hands and feet or in long bones. - While frequent, they are not classified as true bone-forming tumors like osteoid osteoma and can be associated with syndromes like **Ollier's disease** or **Maffucci's syndrome**.

Q: The given image is an x-ray of a 22-year-old female. What is the probable diagnosis based on the x-ray?

Giant cell tumor. ***Giant cell tumor*** - The X-ray shows a **lytic lesion** in the **distal humeral metaphysis extending into the epiphysis**, which is characteristic of a giant cell tumor. - Giant cell tumors typically occur in **young adults (20-40 years old)**, are often **eccentric with no sclerotic rim**, and can be aggressive, resembling the presented image in a 22-year-old female. *Chondroblastoma* - This typically presents as an **epiphyseal lesion** with a sclerotic rim in patients with **open physes**, usually younger than 20 years. - The lesion in the image appears to extend beyond the epiphysis, and the patient's age (22) makes chondroblastoma less likely as the physes are generally closed. *Osteochondroma* - This is an **exophytic lesion** typically growing away from the joint, characterized by a cartilage cap and continuity of the cortex and medullary cavity with the parent bone. - The image shows an **intraosseous lytic lesion**, not an exophytic bony projection. *Aneurysmal bone cyst* - This lesion often presents as an **expansile, lytic lesion** with internal septations and fluid-fluid levels, more common in the **metaphysis of long bones** in individuals younger than 20. - While aneurysmal bone cysts can be expansile, they typically show a "soap bubble" appearance with prominent internal septations, unlike the more solid-appearing lesion characteristic of giant cell tumor in this patient.

Question 1

A 35-year-old woman presents with a painless mass on her hand. An X-ray shows a well-defined, non-sclerotic lytic lesion. What is the most likely diagnosis?

Accepted Answer

Enchondroma

Answer

Giant Cell Tumor

Answer

Chondroblastoma

Answer

Osteochondroma

Question 2

Which bone cyst is most commonly associated with the proximal humerus in children?

Accepted Answer

Unicameral bone cyst

Answer

Aneurysmal bone cyst

Answer

Osteoid osteoma

Answer

Chondroblastoma

Question 3

What considerations should guide the decision-making process for offering neoadjuvant versus adjuvant chemotherapy in a patient with high-grade osteosarcoma of the distal femur?

Accepted Answer

The size of the tumor, presence of metastases at diagnosis, and expected surgical margins

Answer

Patient's preference for chemotherapy timing

Answer

Ease of scheduling for the healthcare team

Answer

Cost of the chemotherapy drugs

Question 4

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 5

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 6

Most common primary bone tumour of hand is:

Accepted Answer

Enchondroma

Answer

Osteoma

Answer

Osteochondroma

Answer

No other options are correct

Question 7

Which of the following is an intramedullary tumor?

Accepted Answer

Ewing sarcoma

Answer

Chondrosarcoma

Answer

Osteochondroma

Answer

Parosteal osteosarcoma

Question 8

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

Accepted Answer

Enchondroma

Answer

Metastases

Answer

Osteoid osteoma

Answer

Osteochondroma

Question 9

Which is the commonest true benign bone neoplasm?

Accepted Answer

Osteoid osteoma

Answer

Hemangioma

Answer

Osteochondroma

Answer

Enchondroma

Question 10

The given image is an x-ray of a 22-year-old female. What is the probable diagnosis based on the x-ray?

Accepted Answer

Giant cell tumor

Answer

Chondroblastoma

Answer

Osteochondroma

Answer

Aneurysmal bone cyst

Bone Tumors — MCQs

Bone Tumors — MCQs

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