Bone Tumors Practice Questions

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.

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: Which of the following is true about Giant cell tumor?

Epiphyseal origin. ***Epiphyseal origin*** - Giant cell tumors (GCTs) characteristically arise in the **epiphysis** or **metaphysis** of long bones, often extending into the subchondral bone [1]. - This distinguishes them from many other bone tumors that typically originate in the diaphysis or metaphysis. *Always benign* - While GCTs are predominantly **benign**, they have a significant potential for **local recurrence** and, in rare cases, can undergo **malignant transformation** or metastasize to the lungs. - Therefore, they are considered to have an **intermediate biological potential**, not strictly benign. *Seen in age less than 15 years* - GCTs are most commonly observed in **young adults**, typically between the ages of 20 and 40 years, after **skeletal maturity**. - They are exceedingly **rare** in individuals younger than 15 years, as the epiphyses are still open. *Usually presents as a lytic lesion without a sclerotic rim* - GCTs are indeed **lytic lesions**, appearing as areas of bone destruction without a significant periosteal reaction or sclerosis, giving them a **"soap-bubble" appearance**. - However, they often have a **thin sclerotic rim** in some parts of the lesion, especially at the margins, which helps differentiate them from more aggressive lesions [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1205-1206.

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.

Q: What is the most common primary source of metastatic bone tumors in males?

Prostate. ***Prostate*** - **Prostate cancer** is the most common primary source of metastatic bone tumors in males due to its high propensity to **metastasize to bone** and its high prevalence in the male population [1]. - These metastases are typically **osteoblastic**, causing increased bone density visible on imaging. *Liver* - While the **liver** can be a site of metastasis for many cancers, it is not a common primary source for **bone metastases** [2]. - Liver cancer (hepatocellular carcinoma) can metastasize, but bone is not its most frequent distant site. *Bone* - **Bone** itself can be the site of primary bone tumors, such as osteosarcoma or Ewing's sarcoma, but these are **not metastatic bone tumors** in the sense of originating elsewhere [3]. - When cancer originates in the bone, it is a primary bone cancer, not a metastatic one. *Brain* - **Brain tumors** (primary intracranial malignancies) generally have a **low propensity to metastasize** outside of the central nervous system. - While rare cases of brain tumor metastasis to bone can occur, it is not a common event or primary source.

Q: In which of the following conditions are polyostotic lesions not seen?

Osteoid osteoma. ***Osteoid osteoma*** - An **osteoid osteoma** is typically a **solitary bone lesion**, meaning it rarely presents as polyostotic lesions. - It characteristically presents with **nocturnal pain relieved by NSAIDs**. *Hemangioma* - While often solitary, **hemangiomas** can occasionally be **multiple or polyostotic**, especially in syndromes like **Klippel-Trenaunay syndrome**. - These are benign **vascular tumors** that can occur in bone. *Fibrous dysplasia* - **Fibrous dysplasia** can be **monostotic** (single lesion) or **polyostotic** (multiple lesions), with the polyostotic form often part of **McCune-Albright syndrome**. - It involves the replacement of normal bone with **fibrous tissue**. *Multiple myeloma* - **Multiple myeloma** is a **hematologic malignancy** characterized by the proliferation of plasma cells in the bone marrow, leading to **multiple lytic bone lesions** (polyostotic). - These lesions often manifest as **pain**, **pathological fractures**, and **hypercalcemia**.

Question 1

Which is the commonest true benign bone neoplasm?

Accepted Answer

Osteoid osteoma

Answer

Hemangioma

Answer

Osteochondroma

Answer

Enchondroma

Question 2

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

Question 3

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 4

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 5

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 6

Which of the following is true about Giant cell tumor?

Accepted Answer

Epiphyseal origin

Answer

Seen in age less than 15 years

Answer

Usually presents as a lytic lesion without a sclerotic rim.

Answer

Always benign

Question 7

Osteoclastoma arises from which part of the bone?

Accepted Answer

Metaphysis

Answer

Diaphysis

Answer

Epiphysis

Answer

None of the options

Question 8

Osteochondroma arises from which part of the bone?

Accepted Answer

Metaphysis

Answer

Medullary cavity

Answer

Diaphysis

Answer

Epiphysis

Question 9

What is the most common primary source of metastatic bone tumors in males?

Accepted Answer

Prostate

Answer

Liver

Answer

Bone

Answer

Brain

Question 10

In which of the following conditions are polyostotic lesions not seen?

Accepted Answer

Osteoid osteoma

Answer

Multiple myeloma

Answer

Fibrous dysplasia

Answer

Hemangioma

Bone Tumors — MCQs

Bone Tumors — MCQs

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