Bone and Soft Tissue Pathology Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Bone and Soft Tissue Pathology. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Bone and Soft Tissue Pathology Indian Medical PG Question 1: Most sensitive modality for detecting bone metastases
- A. Bone scan
- B. PET-CT
- C. Plain radiograph
- D. MRI (Correct Answer)
Bone and Soft Tissue Pathology Explanation: ***MRI***
- **MRI**, especially **whole-body MRI (WB-MRI)**, has the **highest sensitivity (90-100%)** for detecting bone metastases among all imaging modalities.
- It directly visualizes **bone marrow changes** before cortical bone destruction occurs, allowing for earlier detection than other modalities.
- Excellent for detecting both **lytic and sclerotic lesions** and provides superior soft tissue contrast for assessing marrow involvement.
- Particularly sensitive for **spine and pelvic metastases**, and whole-body protocols enable comprehensive skeletal assessment.
*PET-CT*
- **PET-CT with 18F-FDG** is highly sensitive for detecting metabolically active lesions and provides whole-body assessment with both metabolic and anatomical information.
- However, its sensitivity varies by primary tumor type and is **limited for sclerotic/osteoblastic metastases** which may not be FDG-avid.
- While excellent for many malignancies, it has **lower sensitivity than MRI** for pure bone metastases detection, particularly in low-metabolism lesions.
*Bone scan*
- **Bone scan (Tc-99m MDP)** detects increased osteoblastic activity and has been the traditional screening tool with good sensitivity (62-89%).
- Effective for detecting osteoblastic lesions and provides whole-body skeletal survey at relatively low cost.
- However, it is **less sensitive than MRI** and can miss purely lytic metastases or early marrow involvement before osteoblastic response occurs.
*Plain radiograph*
- **Plain radiographs** require significant bone mineral loss (30-50%) to visualize lesions, making them the **least sensitive modality** for bone metastases.
- Useful for assessing established lesions and complications like pathological fractures, but inadequate for screening or early detection.
Bone and Soft Tissue Pathology Indian Medical PG Question 2: Radiotherapy is most useful in:
- A. Melanoma
- B. Pancreatic carcinoma
- C. Osteosarcoma
- D. Seminoma (Correct Answer)
Bone and Soft Tissue Pathology Explanation: ***Seminoma***
- **Seminoma** is a highly **radiosensitive** tumor, making radiotherapy a cornerstone of its treatment, especially for localized disease and in adjuvant settings.
- Due to its chemosensitivity and radiosensitivity, even advanced seminoma often responds well to treatment, leading to **high cure rates**.
*Melanoma*
- **Melanoma** is generally considered **radioresistant**, meaning that it does not respond well to conventional doses of radiation.
- Treatment primarily involves **surgical excision**, immunotherapy, and targeted therapies.
*Pancreatic carcinoma*
- **Pancreatic carcinoma** is notoriously **radioresistant** and has a poor prognosis, with limited effectiveness of standalone radiation therapy.
- Treatment often involves a combination of **surgery**, chemotherapy, and sometimes concurrent chemoradiation, though outcomes remain challenging.
*Osteosarcoma*
- **Osteosarcoma** is primarily managed with **surgical resection** and **neoadjuvant/adjuvant chemotherapy**, as it is relatively radioresistant.
- Radiotherapy is typically reserved for unresectable tumors, palliative care, or when surgery is contraindicated.
Bone and Soft Tissue Pathology Indian Medical PG Question 3: A young girl presented with swelling of right thigh, with history of trauma 2 months back. Now she presents with swelling at mid-shaft of femur & low grade fever. ESR is mildly raised. X-ray shows a laminated periosteal reaction. Next line of investigation would be:
- A. MRI (Correct Answer)
- B. Bone scan
- C. Blood count & CRP
- D. Biopsy
Bone and Soft Tissue Pathology Explanation: ***MRI***
- An **MRI** is the most appropriate next step as it provides excellent detailed imaging of soft tissues and bone marrow, allowing better characterization of the **periosteal reaction**, identifying abscesses, and assessing the extent of bone involvement, crucial for differentiating between infection and tumor.
- The presence of a **laminated periosteal reaction** (like an "onion peel") on X-ray, in conjunction with localized swelling and low-grade fever, is highly suggestive of subacute osteomyelitis or even some bone tumors like Ewing sarcoma, for which MRI is superior for defining the extent.
*Bone scan*
- A **bone scan** (technetium-99m) is sensitive for detecting increased bone turnover, which occurs in infections and tumors, but it is **non-specific**, meaning it cannot differentiate between these conditions.
- While it could show increased uptake in the affected area, it would not provide the anatomical detail needed to characterize the lesion or guide further management as effectively as an MRI.
*Blood count & CRP*
- A **blood count and CRP** would provide information on systemic inflammation (e.g., leukocytosis, elevated CRP for infection), but these are **non-specific**.
- While ESR is already mildly raised, these blood tests would confirm generalized inflammation but **cannot localize or characterize the lesion** in the bone, offering little diagnostic value for the specific problem at this stage without imaging.
*Biopsy*
- A **biopsy** is an invasive procedure and is typically performed after initial imaging studies like X-ray and MRI have characterized the lesion to guide the biopsy site and help determine the nature of the condition (e.g., infection vs. tumor).
- Performing a biopsy as the immediate next step without detailed imaging to assess the extent and nature of the lesion would be premature and potentially less effective in diagnosis.
Bone and Soft Tissue Pathology Indian Medical PG Question 4: Which of the following statements about bone metastasis is false?
- A. Uncommon distal to elbow and knee.
- B. Renal cell carcinoma secondary are expansile
- C. Breast secondary may be osteoblastic
- D. Soft tissue sarcoma causes bony metastasis. (Correct Answer)
Bone and Soft Tissue Pathology Explanation: ***Soft tissue sarcoma causes bony metastasis.***
- This statement is **false** because **soft tissue sarcomas** rarely metastasize to bone.
- They tend to spread via the bloodstream to the lungs, liver, and other soft tissues, but **bony metastases are highly uncommon** [1].
*Uncommon distal to elbow and knee.*
- This statement is **true** as bony metastases predominantly affect the **axial skeleton** and proximal long bones due to their rich vascular supply, while the **distal extremities** are less commonly involved.
- The **red marrow** in the axial skeleton provides a more favorable environment for tumor cell growth.
*Breast secondary may be osteoblastic*
- This statement is **true** as while breast cancer metastases are often lytic, they can also cause **osteoblastic (bone-forming)** lesions, or a mix of both [2].
- **Osteoblastic activity** in breast cancer secondary to bone is often related to the stimulation of osteoblasts by tumor cells.
*Renal cell carcinoma secondary are expansile*
- This statement is **true** as renal cell carcinoma metastases to bone are typically **lytic** and often **expansile**, meaning they can significantly enlarge the affected bone [2].
- These lesions are also known to be highly **vascular**, increasing the risk of pathological fractures.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 282.
[2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-672.
Bone and Soft Tissue Pathology Indian Medical PG Question 5: Which of the following can histologically mimic Giant cell tumor due to presence of osteoclast-like giant cells?
- A. Chondroblastoma
- B. Osteosarcoma (Correct Answer)
- C. Ossifying fibroma
- D. Non ossifying fibroma
Bone and Soft Tissue Pathology Explanation: ***Osteosarcoma (Giant cell-rich variant)***
- **Giant cell-rich osteosarcoma** is a histological variant that contains numerous osteoclast-like giant cells, which can closely mimic benign giant cell tumor
- Key differentiating features include **malignant osteoid production** [3], nuclear atypia in mononuclear cells, and atypical mitoses
- Radiological correlation and careful histological examination of the mononuclear stromal cells are essential for accurate diagnosis
*Chondroblastoma*
- While this benign epiphyseal tumor does contain multinucleated giant cells, its **chondroid matrix** and characteristic **chicken-wire calcification** pattern readily distinguish it from giant cell tumor
- Predominantly affects the epiphysis of skeletally immature patients
*Ossifying fibroma*
- A benign fibro-osseous lesion of the **craniofacial bones** with fibrous tissue and woven bone formation
- Does not typically contain the abundant osteoclast-like giant cells characteristic of giant cell tumor
*Non-ossifying fibroma*
- A common benign fibrous lesion found in the **metaphysis** of long bones in children [2]
- Contains spindle cells and foamy macrophages but **lacks the prominent osteoclast-like giant cells** [2] seen in giant cell tumor [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.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1208.
[3] 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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