Tumor-Like Conditions Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Tumor-Like Conditions. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Tumor-Like Conditions Indian Medical PG Question 1: Most common site of myositis ossificans ?
- A. Shoulder
- B. Wrist
- C. Quadriceps/Thigh (Correct Answer)
- D. Elbow
Tumor-Like Conditions Explanation: ***Quadriceps/Thigh***
- The **quadriceps and thigh** muscles are frequently affected due to their common involvement in sports injuries and trauma.
- This region is prone to **hematoma formation** after contusions, which can predispose to ectopic bone formation.
*Shoulder*
- While the shoulder can be affected by myositis ossificans, it is **less common** than the quadriceps.
- Traumatic myositis ossificans in the shoulder typically involves the **deltoid muscle**.
*Wrist*
- Myositis ossificans of the **wrist is rare** and usually occurs after severe trauma or crush injuries.
- The small muscle mass and limited direct trauma to the wrist muscles make it an **unlikely primary site**.
*Elbow*
- Myositis ossificans can occur around the elbow, particularly in the **brachialis muscle**, often following dislocations or fractures.
- However, the elbow is still **less commonly affected overall** compared to the large muscle groups of the thigh.
Tumor-Like Conditions Indian Medical PG Question 2: Osteitis fibrosa cystica is associated with which of the following conditions?
- A. Hyperparathyroidism (Correct Answer)
- B. Hypoparathyroidism
- C. Hypothyroidism
- D. Hyperthyroidism
Tumor-Like Conditions Explanation: ***Hyperparathyroidism***
- **Osteitis fibrosa cystica** is a classic bone manifestation of severe, chronic **hyperparathyroidism**, characterized by increased osteoclastic activity.
- This condition results in the replacement of normal bone with **fibrous tissue** and **cysts**, often leading to bone pain, fractures, and deformities.
*Hypoparathyroidism*
- **Hypoparathyroidism** is characterized by low parathyroid hormone (PTH) levels and **hypocalcemia**, which typically leads to increased bone density, not bone degradation.
- Its manifestations include muscle cramps, seizures, and tetany, without the bone lesions seen in osteitis fibrosa cystica.
*Hypothyroidism*
- **Hypothyroidism** is a state of thyroid hormone deficiency, affecting metabolism and growth but not directly causing osteitis fibrosa cystica.
- It can lead to slowed bone turnover and delayed growth in children, but not the specific bone lesions associated with parathyroid dysfunction.
*Hyperthyroidism*
- **Hyperthyroidism** can cause increased bone turnover and **osteoporosis** due to accelerated bone resorption, but it does not lead to the distinct fibrous and cystic bone changes of osteitis fibrosa cystica.
- Its effects on bone are generally a diffuse reduction in bone mineral density rather than specific lytic lesions or brown tumors.
Tumor-Like Conditions Indian Medical PG Question 3: Most common benign tumor of bone?
- A. Osteoma
- B. Simple bone cyst
- C. Osteochondroma (Correct Answer)
- D. Osteoid osteoma
Tumor-Like Conditions 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.
Tumor-Like Conditions Indian Medical PG Question 4: Following are seen in fibrous dysplasia EXCEPT
- A. No premalignant change (Correct Answer)
- B. Ground glass appearance on X-ray
- C. Expanding rib lesions
- D. Expanding lesions of maxilla
Tumor-Like Conditions Explanation: ***No premalignant change***
- Fibrous dysplasia is a **benign condition** that does NOT undergo premalignant change [1].
- However, there is a small but definite risk of **malignant transformation** (not premalignant change), particularly to **osteosarcoma**, in about 0.5% of cases [1].
- This risk is higher in patients who have received **radiation therapy** for the condition.
- **Key distinction**: Malignant transformation is different from premalignant change—fibrous dysplasia remains benign but can rarely transform directly to malignancy [1].
*Ground glass appearance on X-ray*
- This is a **classic radiographic feature** of fibrous dysplasia, resulting from immature woven bone and fibrous tissue within the lesion [2].
- It describes the hazy, ill-defined radiodensity due to the lack of organized trabeculae.
*Expanding rib lesions*
- Fibrous dysplasia frequently affects the **ribs**, leading to their expansion and potential for pathological fractures [1].
- Rib involvement is particularly common in the **monostotic form** of the disease [1].
*Expanding lesions of maxilla*
- The **maxilla** is a common site for fibrous dysplasia, especially in the **craniofacial form**.
- Maxillary lesions can cause expansion, facial asymmetry, and dental abnormalities.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1208.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1208-1209.
Tumor-Like Conditions Indian Medical PG Question 5: All of the following are features of myositis ossificans except -
- A. Commonly occurs around the elbow
- B. Can be post traumatic or occur without trauma also
- C. Massaging is a known associated factor
- D. It matures from inside out (Correct Answer)
Tumor-Like Conditions Explanation: ***It matures from inside out***
- This statement is incorrect; **myositis ossificans** characteristically matures from the **outside in**, meaning the periphery ossifies first, creating a distinct radiologic appearance.
- The mature bone is found at the periphery of the lesion, while the more immature, cellular components are centrally located.
*Commonly occurs around the elbow*
- Myositis ossificans is frequently observed around joints, with the **elbow** being one of the most common sites due to its vulnerability to trauma.
- Other common locations include the **thigh** and **shoulder**.
*Can be post traumatic or occur without trauma also*
- While most commonly **post-traumatic**, myositis ossificans can also occur atraumatically, sometimes referred to as **myositis ossificans progressiva** or fibrodysplasia ossificans progressiva, a rare genetic disorder.
- The traumatic form is often preceded by a significant contusion or muscle injury.
*Massaging is a known associated factor*
- **Aggressive massage** or manipulation following muscle trauma can exacerbate local tissue injury and enhance the conditions conducive to heterotopic ossification, including myositis ossificans.
- This is why gentle management of muscle contusions is crucial to prevent its development.
Tumor-Like Conditions Indian Medical PG Question 6: A 33-year-old man presented with a slowly progressive swelling in the middle third of his right tibia. X-ray examination revealed multiple sharply demarcated radiolucent lesions separated by areas of dense and sclerotic bone. Microscopic examination of a biopsy specimen revealed islands of epithelial cells in a fibrous stroma. Which of the following is the most probable diagnosis?
- A. Fibrous cortical defect
- B. Osteosarcoma
- C. Osteofibrous dysplasia
- D. Adamantinoma (Correct Answer)
Tumor-Like Conditions Explanation: ***Adamantinoma***
- This diagnosis is strongly supported by **multiple sharply demarcated radiolucent lesions** with areas of **dense and sclerotic bone** on X-ray, and islands of **epithelial cells in a fibrous stroma** on biopsy.
- Adamantinoma is a rare, malignant bone tumor almost exclusively found in the **tibia** or fibula, characterized by its slow growth and epithelial differentiation.
*Fibrous cortical defect*
- These are common, **benign fibrous lesions** typically found in the metaphysis of long bones, often asymptomatic and spontaneously resolving [1].
- Histologically, they consist of fibroblasts, histiocytes, and macrophages, without epithelial islands [1].
*Osteosarcoma*
- This is a highly malignant tumor characterized by the production of **osteoid** or **immature bone** by malignant cells, which is not described.
- Radiographically, it usually presents with an aggressive, destructive lesion, often with "sunburst" or "Codman's triangle" patterns, which differ from the description.
*Osteofibrous dysplasia*
- This benign fibro-osseous lesion primarily affects the **tibia** in children and young adults, often presenting with painless swelling.
- While it can show fibrous tissue and immature bone, it lacks the characteristic epithelial islands seen in adamantinoma.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1206-1208.
Tumor-Like Conditions Indian Medical PG Question 7: Inspiratory stridor is found in what kind of lesions:
- A. Supraglottic (Correct Answer)
- B. Subglottic
- C. Tracheal
- D. Bronchus
Tumor-Like Conditions Explanation: ***Supraglottic***
- Lesions in the **supraglottic** region (e.g., epiglottitis, supraglottic foreign body) cause inspiratory stridor due to the collapse of soft tissues above the vocal cords during inspiration.
- The narrowed airway during inspiration creates a high-pitched, harsh sound.
*Subglottic*
- **Subglottic** lesions typically cause a **biphasic stridor**, meaning stridor is present during both inspiration and expiration.
- This is because the subglottis is a rigid area; narrowing at this level causes turbulent airflow during both phases of breathing.
*Tracheal*
- **Tracheal** lesions can produce **biphasic stridor** if they are in the cervical trachea due to fixed airway narrowing.
- If the lesion is in the lower, intrathoracic trachea, it might primarily cause **expiratory stridor** or a biphasic stridor depending on the degree of narrowing and its fixity.
*Bronchus*
- Lesions in the **bronchus** (e.g., foreign body, tumor) typically lead to **expiratory stridor** or wheezing.
- Airway narrowing at this level causes air trapping and turbulent flow predominantly during exhalation when the bronchial walls naturally constrict.
Tumor-Like Conditions Indian Medical PG Question 8: 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
Tumor-Like Conditions 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.
Tumor-Like Conditions Indian Medical PG Question 9: Most common site of osteogenic sarcoma is:
- A. Tibia, lower end
- B. Femur, upper end
- C. Tibia, upper end
- D. Femur, lower end (Correct Answer)
Tumor-Like Conditions Explanation: ***Femur, lower end***
- The **distal femur** is the most common site for osteogenic sarcoma, accounting for approximately **40% of all cases** [1].
- This region, along with the **proximal tibia**, are the most frequent locations for this primary bone tumor [1].
*Tibia, lower end*
- While osteogenic sarcoma can occur in the **tibia**, the **proximal end** is more commonly affected than the distal end.
- The distal tibia is a less frequent site compared to the distal femur or proximal tibia.
*Femur, upper end*
- The **proximal femur** is a recognized site for osteogenic sarcoma, but it is less common than the **distal femur**.
- Tumors in the proximal femur account for a smaller percentage of overall osteosarcoma cases.
*Tibia, upper end*
- The **proximal tibia** is the **second most common site** for osteogenic sarcoma, frequently affected after the distal femur [1].
- However, the question asks for the *most* common site, which remains the distal femur.
Tumor-Like Conditions Indian Medical PG Question 10: A 45 yrs male presented with an expansile lesion in the centre of femoral metaphysis. The lesion shows Endosteal scalloping and punctuate calcifications. Most likely diagnosis is:
- A. Fibrous Dysplasia
- B. Chondrosarcoma (Correct Answer)
- C. Simple bone cyst
- D. Osteosarcoma
Tumor-Like Conditions Explanation: ***Chondrosarcoma***
- An **expansile lesion** within the **femoral metaphysis** with **endosteal scalloping** and **punctate calcifications** is highly characteristic of a chondrosarcoma.
- The punctate/arc-and-ring calcifications are typical for cartilage matrix, which is the hallmark of chondrosarcoma, and the patient's age (45 years) fits the typical demographic.
*Fibrous Dysplasia*
- This condition presents as a **ground-glass matrix** on imaging, not punctate calcifications.
- While it can be expansile, it typically does not show prominent endosteal scalloping with cartilage calcifications.
*Simple bone cyst*
- Simple bone cysts are typically **lytic lesions** that do not show punctate calcifications or aggressive endosteal scalloping.
- They are often **fluid-filled** and common in children/adolescents, whereas this patient is 45 years old.
*Osteosarcoma*
- Osteosarcomas are characterized by **osteoid matrix formation** and often have a more aggressive appearance with a **sunburst or spiculated periosteal reaction** and bone formation, not punctate cartilage calcifications.
- While it can be expansile, the calcification pattern described points away from osteosarcoma.
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