Bone Tumors Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Bone Tumors. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Bone Tumors Indian Medical PG Question 1: Which of the following is a differential of giant cell tumor?
- A. Chondroblastoma (Correct Answer)
- B. Osteogenic sarcoma
- C. Ossifying fibroma
- D. Non-ossifying fibroma
Bone Tumors Explanation: **Chondroblastoma**
- Both **Chondroblastoma** and **giant cell tumor (GCT)** are epiphyseal lesions that can occur in a similar age group and have some overlapping radiographic features, making them a differential.
- Histologically, chondroblastoma can contain **multinucleated giant cells**, which may be confused with those found in GCT.
*Osteogenic sarcoma*
- **Osteogenic sarcoma (osteosarcoma)** is a malignant bone tumor primarily affecting the metaphysis of long bones, in contrast to GCT's epiphyseal location [1].
- Radiographically, osteosarcoma often presents with an aggressive, destructive pattern including **periosteal reaction** (e.g., sunburst, Codman's triangle), which is less typical for GCT [1].
*Ossifying fibroma*
- **Ossifying fibroma** is a benign fibro-osseous lesion most commonly found in the jaws, distinctly different from GCT's predilection for epiphyses of long bones.
- Histologically, it's characterized by the presence of **mineralized material** resembling bone or cementum within a fibrous stroma, unlike the abundant multinucleated giant cells of GCT [1].
*Non-ossifying fibroma*
- A **non-ossifying fibroma (NOF)**, also known as a fibrous cortical defect, is typically a benign, asymptomatic, and self-limiting lesion found in the metaphysis of long bones, usually in children and adolescents.
- It is characterized by **fibrous tissue** and foam cells but lacks the prominent multinucleated giant cells and epiphyseal location characteristic of GCT [2].
**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] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1208.
Bone Tumors Indian Medical PG Question 2: What is the most appropriate treatment for a soap bubble appearance at the lower end of the radius?
- A. Local excision
- B. Excision and bone grafting (Correct Answer)
- C. Amputation
- D. Radiotherapy
Bone Tumors Explanation: ***Excision and bone grafting***
- A **soap bubble appearance** at the lower end of the radius is highly suggestive of a **giant cell tumor (GCT)**, which is locally aggressive and has a high recurrence rate after simple curettage.
- **Excision of the tumor and filling the defect with bone graft** is the preferred treatment to reduce recurrence and maintain skeletal integrity.
*Local excision*
- While local excision might remove the visible tumor, **GCTs are known to recur frequently** (up to 50%) after intralesional treatments like simple curettage.
- It does not adequately address microscopic extensions or the risk of **local aggressive behavior**.
*Amputation*
- **Amputation is an overly aggressive and unnecessary treatment** for a GCT, as it is a benign but locally aggressive tumor.
- It would be considered only in rare cases of extensive soft tissue invasion or intractable recurrence, which is not implied by a "soap bubble appearance."
*Radiotherapy*
- **Radiotherapy is generally not the first-line treatment for GCTs** due to concerns about **malignant transformation** (osteosarcoma) in a small percentage of cases, especially with high doses.
- It may be considered for unresectable tumors or recurrent lesions in difficult anatomical locations, or as an adjuvant.
Bone Tumors Indian Medical PG Question 3: Which of the following is not true about osteosarcoma?
- A. Seen in the metaphyseal region of the long bones
- B. Lung metastasis is common
- C. Secondary osteosarcoma is seen in older age groups
- D. Most commonly arises in the epiphyseal region (Correct Answer)
Bone Tumors Explanation: ***Most commonly arises in the epiphyseal region***
- This statement is **FALSE** - osteosarcoma most commonly arises in the **metaphyseal region** of long bones, particularly around the knee (distal femur, proximal tibia) and proximal humerus [1].
- The metaphysis is the region where bone growth is most active, which explains why osteosarcoma preferentially occurs there.
- The epiphysis (growth plate region) is **not** the typical location for osteosarcoma.
*Seen in the metaphyseal region of the long bones*
- This is **TRUE** - osteosarcoma characteristically arises in the **metaphyseal regions** of long bones, especially around the knee and proximal humerus where growth is most active [1].
*Lung metastasis is common*
- This is **TRUE** - the lungs are the most common site of distant metastasis in osteosarcoma, occurring in up to 80% of patients who develop metastatic disease [1].
- Pulmonary metastasis significantly impacts prognosis and treatment [1].
*Secondary osteosarcoma is seen in older age groups*
- This is **TRUE** - while primary osteosarcoma affects children and young adults (peak 10-20 years), **secondary osteosarcoma** occurs in older patients, typically arising in association with Paget's disease, prior radiation therapy, or bone infarcts [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. 1200-1202.
Bone Tumors Indian Medical PG Question 4: True about bone tumor is:
- A. Multiple myeloma is seen in more than 55 years of age and above (Correct Answer)
- B. Osteoclastoma- fifth decade
- C. Osteogenic sarcoma-fourth decade
- D. Chondrosarcoma -first decade
Bone Tumors Explanation: ***Multiple myeloma is seen in more than 55 years of age and above***
- **Multiple myeloma** is a plasma cell malignancy that predominantly affects older adults, with the median age of diagnosis being around **69 years** [1]
- Its incidence significantly increases with age, making it rare before the age of 40 and most prevalent in those **over 55 years** [1][2]
- This statement is **medically accurate** and represents the correct answer
*Osteoclastoma - fifth decade*
- **Osteoclastoma** (giant cell tumor of bone) typically occurs in young adults, primarily in their **20s to 40s** (2nd to 4th decade)
- Peak incidence is in the **3rd-4th decade**, not the fifth decade
- This statement is **incorrect** as fifth decade is an atypical presentation
*Osteogenic sarcoma - fourth decade*
- **Osteogenic sarcoma** (osteosarcoma) has a **bimodal age distribution** with peaks in adolescence (10-20 years, 2nd decade) and a smaller peak in older adults over 60 years
- It is **uncommon in the fourth decade** (30s), which falls outside its primary age groups
- This statement is **incorrect**
*Chondrosarcoma - first decade*
- **Chondrosarcoma** is a malignant cartilaginous tumor that predominantly affects older adults, typically in their **50s and 60s** (5th-6th decade)
- It is **exceedingly rare in the first decade** of life (0-9 years), and its incidence significantly increases with age
- This statement is **incorrect**
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-618.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 606-607.
Bone Tumors Indian Medical PG Question 5: A 15-year-old boy is injured while playing cricket. X-rays of the leg rule out a possible fracture. The radiologist reports the boy has evidence of aggressive bone tumor with both bone destruction and soft tissue mass. The bone biopsy reveals a bone cancer with neural differentiation. Which of the following is the most likely diagnosis?
- A. Ewing's sarcoma (Correct Answer)
- B. Osteosarcoma
- C. Neuroblastoma
- D. Chondroblastoma
Bone Tumors Explanation: ***Ewing's sarcoma***
- This is an aggressive bone tumor that commonly affects children and adolescents, characterized by **bone destruction** and a **soft tissue mass**.
- A key diagnostic feature is its **neural differentiation**, often identified by the presence of a characteristic **t(11;22) translocation**.
*Osteosarcoma*
- While it is an aggressive bone tumor in adolescents, it primarily demonstrates **osteoid production** rather than neural differentiation [1]. [2]
- X-rays typically show a **sunburst appearance** and **Codman's triangle**, which are not specified here [1].
*Neuroblastoma*
- This is a pediatric malignancy of the **sympathetic nervous system** that can metastasize to bone, but it originates from neural crest cells and is not primarily a bone tumor.
- While it shows neural differentiation, the primary tumor is usually in the **adrenal gland** or sympathetic ganglia, not directly arising from bone.
*Chondroblastoma*
- This is a rare, benign cartilaginous tumor typically found in the **epiphyses of long bones** in adolescents but is not generally aggressive or associated with neural differentiation.
- It involves **cartilage formation**, which is distinct from the aggressive bone destruction and neural features described [2].
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1200-1202.
[2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674.
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