Benign Bone Tumors Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Benign Bone Tumors. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Benign Bone Tumors Indian Medical PG Question 1: A patient presents with pain in the thigh, relieved by aspirin. X-ray shows a radiolucent mass surrounded by sclerosis. Diagnosis is ?
- A. Osteoma
- B. Osteoclastoma
- C. Osteoblastoma
- D. Osteoid osteoma (Correct Answer)
Benign Bone Tumors Explanation: ***Osteoid osteoma***
- Characterized by **pain that is classically relieved by aspirin or NSAIDs**, due to high prostaglandin production within the lesion.
- Radiographically, it appears as a **small radiolucent nidus (lesion) less than 2 cm**, surrounded by a dense sclerotic bone reaction.
*Osteoma*
- This is a **benign tumor of mature bone**, most commonly found on the skull and facial bones.
- It typically presents as a **hard, solitary, immobile mass** and is usually asymptomatic, not causing pain relieved by aspirin.
*Osteoclastoma*
- Also known as a **giant cell tumor of bone**, it is a locally aggressive tumor.
- It typically affects the **epiphysis and metaphysis of long bones** (e.g., around the knee) and is not characteristically relieved by aspirin.
*Osteoblastoma*
- This is a **larger variant of osteoid osteoma** (>2 cm), also bone-forming, but the pain is generally less responsive to aspirin, and it tends to be more aggressive.
- It is more commonly found in the **spine and sacrum**, unlike the thigh in this case.
Benign Bone Tumors Indian Medical PG Question 2: Which of the following is an epiphyseal tumor?
- A. Osteosarcoma
- B. Osteoid osteoma
- C. Chondroblastoma (Correct Answer)
- D. Adamantinoma
Benign Bone Tumors Explanation: ***Chondroblastoma***
- **Chondroblastoma** is a rare, benign cartilaginous tumor that typically originates in the **epiphysis** of long bones before the closure of growth plates.
- It is histologically characterized by chondroblast-like cells, multinucleated giant cells, and chondroid matrix, and radiographically appears as a lytic lesion with a sclerotic rim in the epiphysis.
*Osteosarcoma*
- **Osteosarcoma** is the most common primary malignant bone tumor and typically originates in the **metaphysis** of long bones, particularly around the knee.
- It invades the surrounding bone and soft tissues, often presenting with a **Codman triangle** or **sunburst pattern** on imaging studies.
*Osteoid osteoma*
- **Osteoid osteoma** is a benign bone-forming tumor primarily found in the **cortex** of long bones, although it can occur in other locations, presenting with nocturnal pain relieved by NSAIDs.
- It is characterized by a central radiolucent nidus surrounded by reactive sclerotic bone.
*Adamantinoma*
- **Adamantinoma** is an extremely rare, low-grade malignant tumor that almost exclusively occurs in the **tibia diaphysis**.
- It is thought to originate from epithelial cells and presents as a lytic lesion within the cortical bone, often with a polycystic appearance.
Benign Bone Tumors Indian Medical PG Question 3: Which bone tumor involves the epiphysis?
- A. Osteosarcoma
- B. Giant cell tumor (Correct Answer)
- C. Ewing's sarcoma
- D. Multiple myeloma
Benign Bone Tumors Explanation: ***Giant cell tumor***
- **Giant cell tumor (GCT)**, also known as osteoclastoma, characteristically arises in the **epiphysis** [1] or **metaphysis** of long bones in adults.
- It is a benign but locally aggressive tumor that often presents with pain, swelling, and reduced range of motion in the affected joint [1].
*Osteosarcoma*
- **Osteosarcoma** typically arises in the **metaphysis** of long bones, particularly around the knee (distal femur, proximal tibia).
- It is a highly malignant primary bone tumor characterized by the production of **osteoid** by tumor cells [2].
*Ewing's sarcoma*
- **Ewing's sarcoma** most commonly affects the **diaphysis** of long bones or flat bones (e.g., pelvis, scapula, ribs).
- It is characterized by small, round, blue cells and often presents with pain, swelling, and systemic symptoms like fever.
*Multiple myeloma*
- **Multiple myeloma** is a malignancy of **plasma cells** that primarily affects the **bone marrow** and can cause widespread osteolytic lesions.
- It typically presents in older adults and affects bones with active marrow, such as the vertebrae, ribs, skull, and pelvis, rather than being localized to the epiphysis as a primary bone tumor.
**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.
[2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674.
Benign Bone Tumors Indian Medical PG Question 4: Characteristic radiological feature of fibrous dysplasia is:
- A. Ground glass appearance (Correct Answer)
- B. Cortical erosion
- C. Bone enlargement
- D. Thickened bone matrix
Benign Bone Tumors Explanation: ***Ground glass appearance***
- The "ground glass" appearance on **radiography** is a classic and highly characteristic feature of **fibrous dysplasia**, reflecting the immature, woven bone and fibrous tissue within the lesion.
- This specific pattern results from the uniform, finely trabeculated osseous tissue that is less dense than normal bone, creating a hazy, frosted appearance.
*Cortical erosion*
- While significant **tumor growth** in any bone lesion can lead to cortical erosion, it is not a specific or characteristic primary feature of **fibrous dysplasia**.
- **Cortical erosion** is more commonly associated with aggressive or rapidly expanding lesions, such as malignant tumors or infections.
*Bone enlargement*
- **Bone enlargement** can occur in fibrous dysplasia due to the expansion of the abnormal fibrous and osseous tissue, but it is a non-specific finding.
- Many conditions, including various **benign** and **malignant tumors**, can cause bone enlargement, making it less diagnostic on its own.
*Thickened bone matrix*
- Fibrous dysplasia involves a disorganized and immature bone matrix, characterized by **woven bone**, not a thickened, well-organized normal bone matrix.
- **Thickened bone matrix** may be seen in conditions like osteopetrosis or Paget's disease, which involve different pathological bone remodeling processes.
Benign Bone Tumors Indian Medical PG Question 5: Which of the following is a bone-forming malignant tumor?
- A. Osteoid osteoma
- B. Osteosarcoma (Correct Answer)
- C. Chondroblastoma
- D. Giant cell tumor
Benign Bone Tumors Explanation: ***Osteosarcoma***
- **Osteosarcoma** is the most common **primary malignant bone tumor**, characterized by the production of **osteoid** (immature bone) by malignant osteoblasts [1], [2].
- It typically arises in the **metaphysis of long bones** (e.g., distal femur, proximal tibia, proximal humerus) and often presents with pain and swelling [1], [2].
*Osteoid osteoma*
- **Osteoid osteoma** is a benign bone tumor characterized by a small nidus of **osteoid-forming tissue** surrounded by sclerotic bone.
- While it involves osteoid formation, it is **not malignant** and does not metastasize.
*Chondroblastoma*
- **Chondroblastoma** is a rare, **benign cartilage-forming tumor** that typically occurs in the **epiphysis of long bones** in skeletally immature individuals.
- It is composed of chondroblast-like cells and does not produce osteoid or show malignant features.
*Giant cell tumor*
- **Giant cell tumor** of bone is an **aggressive, locally destructive benign tumor** characterized by numerous osteoclast-like giant cells and spindle-shaped stromal cells.
- It arises in the **epiphysis/metaphysis** of long bones (e.g., distal femur, proximal tibia) but is not a bone-forming tumor and is typically not malignant, though it has a high recurrence rate.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-674.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1200-1202.
Benign Bone Tumors Indian Medical PG Question 6: The image shows a wrist deformity and an X-ray of a bone lesion near the distal radius. Based on the clinical and radiological features, what is the most likely diagnosis?
- A. Ewings Sarcoma
- B. Osteochondroma
- C. Giant Cell Tumor (GCT) (Correct Answer)
- D. Osteoid Osteoma
Benign Bone Tumors Explanation: ***Giant Cell Tumor (GCT)***
* The image shows a **lytic (lucid) lesion** located in the **epiphysis/metaphysis of the distal radius**, which is a classic presentation site for GCT.
* GCTs are typically seen in individuals aged 20-40, often present with **pain, swelling, and reduced range of motion**, and can show a **soap bubble appearance** on X-ray even with cortical erosion as seen in the image.
*Ewing's Sarcoma*
* Ewing's Sarcoma commonly affects the **diaphysis of long bones** and may present with an **onion skin periosteal reaction**, none of which are clearly depicted.
* It primarily affects children and young adults (5-20 years old), which does not align with the assumed adult presentation given the fused epiphysis.
*Osteochondroma*
* Osteochondromas are **bony prominences covered by cartilage** and grow **outward from the bone surface**, often away from the joint, unlike the intraosseous lytic lesion seen.
* They typically appear as **pedunculated or sessile exostoses** and are benign growth plate abnormalities, not lytic lesions of the marrow cavity.
*Osteoid Osteoma*
* Osteoid osteomas are characterized by a **small lucent nidus** (usually <1.5 cm) surrounded by a significant margin of **sclerotic bone**, which is not seen here.
* They classically cause **nocturnal pain** relieved by NSAIDs and are typically smaller than the lesion depicted, which appears expansile.
Benign Bone Tumors Indian Medical PG Question 7: A patient with GCT, which of the following is false?
- A. Defined margins
- B. Chemotherapy is the mainstay of treatment (Correct Answer)
- C. Epiphyseo-metaphyseal location
- D. Eccentric
Benign Bone Tumors Explanation: ***Chemotherapy is the mainstay of treatment***
- This statement is **false** because **Giant Cell Tumor of Bone (GCT)** therapy primarily involves **surgical resection**, with or without adjuvant therapies like **denosumab**.
- **Chemotherapy** is generally *not* the first-line treatment for GCT, as these tumors respond poorly to it; it's usually reserved for cases of **metastatic GCT** or when other treatments fail.
*Defined margins*
- GCTs often present radiographically with **well-defined, non-sclerotic margins**, which indicates a lytic lesion that is often locally aggressive but typically doesn't invade widely.
- While they are locally destructive, their borders are usually visible, helping distinguish them from other bone tumors.
*Epiphyseo-metaphyseal location*
- GCTs commonly originate in the **metaphysis** of long bones and **extend into the epiphysis** after the growth plate has closed.
- This characteristic location near a joint is a classic diagnostic feature of GCT, especially in adults.
*Eccentric*
- GCTs typically arise **eccentrically** within the bone, meaning they originate off-center in the bone marrow cavity before expanding and thinning the cortex.
- This eccentric growth pattern is a distinguishing feature, particularly in contrast to other bone tumors which might be centrally located.
Benign Bone Tumors Indian Medical PG Question 8: Most common benign tumor of bone?
- A. Osteoma
- B. Simple bone cyst
- C. Osteochondroma (Correct Answer)
- D. Osteoid osteoma
Benign Bone Tumors Explanation: ***Osteochondroma***
- This is the **most common benign bone tumor**, characterized by a bony spur with a cartilaginous cap.
- It typically arises from the **metaphysis of long bones**, especially around the knee.
*Osteoma*
- Osteomas are **benign, slow-growing tumors** composed of mature compact or cancellous bone.
- They are most commonly found in the **skull and facial bones**, not typically in long bones.
*Simple bone cyst*
- This is a **fluid-filled lesion** of bone, not a true neoplasm, frequently found in the metaphysis of long bones in children.
- It is often discovered incidentally or after a **pathological fracture**.
*Osteoid osteoma*
- Characterized by a **small, benign bone tumor** with a central nidus of osteoid and trabecular bone, surrounded by reactive sclerotic bone.
- It classically causes **nocturnal pain** that is relieved by NSAIDs.
Benign Bone Tumors Indian Medical PG Question 9: Most common site of adamantinoma of the long bones is -
- A. Tibia (Correct Answer)
- B. Ulna
- C. Fibula
- D. Femur
Benign Bone Tumors Explanation: ***Tibia***
- Adamantinoma is a rare, malignant bone tumor that has a strong predilection for the **tibia**, accounting for approximately 85-90% of cases in long bones.
- It most commonly occurs in the **diaphysis of the tibia** but can also be found in the metaphysis.
*Ulna*
- While adamantinoma can rarely affect other long bones, the **ulna is not a common site** for its occurrence.
- The incidence of adamantinoma in the upper extremities, including the ulna, is significantly lower compared to the tibia.
*Fibula*
- The **fibula is an uncommon site** for adamantinoma, with only a small percentage of cases reported in this bone.
- When it does occur in the fibula, it usually involves the mid-diaphysis.
*Femur*
- The **femur is also a rare location** for adamantinoma, with only a handful of cases documented in medical literature.
- The vast majority of adamantinomas consistently originate in the lower leg, particularly the tibia.
Benign Bone Tumors Indian Medical PG Question 10: Which of the following is an epiphyseal lesion?
- A. Fibrosarcoma
- B. Chondroblastoma (Correct Answer)
- C. Chondrosarcoma
- D. Non-ossifying fibroma
Benign Bone Tumors Explanation: **Chondroblastoma**
- **Chondroblastoma** is a rare, benign bone tumor that typically arises in the **epiphysis** of long bones before epiphyseal fusion.
- It specifically originates from **chondroblasts** within the epiphyseal growth plate region.
*Fibrosarcoma*
- **Fibrosarcoma** is a malignant tumor of fibrous connective tissue origin, typically found in the **metaphysis** or **diaphysis** of long bones.
- It rarely affects the **epiphyseal** region and is characterized by aggressive local invasion and metastases.
*Chondrosarcoma*
- **Chondrosarcoma** is a malignant tumor of cartilage, commonly arising in the **metaphysis** or **diaphysis** of long bones, particularly the femur, humerus, and pelvis.
- While it involves cartilage, its typical location is not primarily **epiphyseal** and it is characterized by malignant cartilaginous matrix.
*Non-ossifying fibroma*
- A **non-ossifying fibroma** (NOF), also known as a fibrous cortical defect, is a common benign fibrous lesion typically found in the **metaphysis** of long bones.
- These lesions are usually asymptomatic and self-limiting, often resolving spontaneously, and do not originate in the **epiphysis**.
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