Bone Tumors Practice Questions

Q: A 28-year-old female presents to the clinic with a complaint of dull, aching pain in her left hand after accidentally striking her finger against a door frame. On physical examination, there is mild tenderness over the affected area, but the range of m otion is preserved. An X -ray of the hand is shown below. Based on the clinical presentation and radiographic findings, what is the most likely diagnosis?

Enchondroma. ### ***Enchondroma*** - This is the most common **benign tumor of the small bones of the hands and feet**, typically appearing as a **well-circumscribed lytic lesion** with internal **calcifications** (often described as 'popcorn' or 'ring and arc'). - While often asymptomatic, they frequently present after a **pathological fracture** following minor trauma, as seen in this patient, and do not typically limit the range of motion unless a fracture has occurred. *Giant cell tumor* - Typically presents as an **epiphyseal, lytic lesion** that extends to the subchondral bone, most commonly around the **knee region** (distal femur, proximal tibia). - Radiographically, it is often described as a **'soap-bubble' appearance** and is generally more locally aggressive than an enchondroma. *Brown tumor* - This is not a true neoplasm but rather a manifestation of **hyperparathyroidism**, characterized by osteoclastic resorption and fibrous replacement of bone. - Diagnosis requires evaluation of serum **calcium, phosphate, and parathyroid hormone (PTH)** levels, and it is usually associated with **renal osteodystrophy**. *Aneurysmal bone cyst* - Classically appears as an **expansile, lytic lesion** with internal septations on plain radiography, often described as an **'eggshell' cortex**. - It is more common in the **metaphysis of long bones** and the posterior elements of the spine rather than the phalanges of the hand.

Q: A 9-year-old child presents with pain and swelling over the mid -shaft of the tibia, associated with low -grade fever and an elevated erythrocyte sedimentation rate (ESR). An X-ray of the affected limb is shown below. Based on the clinical features and radiographic findings, what is the most likely diagnosis?

Ewing sarcoma. ***Ewing sarcoma*** - Classically presents in the **diaphysis** (mid-shaft) of long bones in children and adolescents, causing localized pain, swelling, and systemic symptoms like fever and elevated **ESR** that mimic infection. - Radiographic findings typically show an **

Q: In the treatment of osteosarcoma, all of the following chemotherapy agents are used EXCEPT:

Vincristine. **Explanation:** The standard of care for **Osteosarcoma** involves a multimodal approach consisting of neoadjuvant chemotherapy, wide local surgical excision (limb-salvage surgery), and adjuvant chemotherapy. **Why Vincristine is the correct answer:** Vincristine is a vinca alkaloid that inhibits microtubule formation. While it is a cornerstone in the treatment of **Ewing’s Sarcoma** (as part of the VAC/VAI regimen), it has no proven efficacy against Osteosarcoma. Therefore, it is not included in standard osteosarcoma protocols. **Analysis of other options:** * **High-dose Methotrexate (with Leucovorin rescue):** This is a primary agent used to inhibit dihydrofolate reductase, crucial for treating high-grade osteosarcoma. * **Doxorubicin (Adriamycin):** An anthracycline that remains one of the most effective drugs for bone sarcomas. * **Cyclophosphamide:** While not part of the primary "MAP" (Methotrexate, Adriamycin, Platinum) regimen, it is frequently used in **second-line or salvage therapy** for recurrent or refractory osteosarcoma. **High-Yield NEET-PG Pearls:** 1. **Standard Regimen (MAP):** The most common chemotherapy combination for Osteosarcoma is **M**ethotrexate, **A**driamycin (Doxorubicin), and **P**latin (Cisplatin). 2. **Ewing’s Sarcoma Regimen:** Remember the mnemonic **VAC** (Vincristine, Adriamycin, Cyclophosphamide) or **VAI** (Ifosfamide instead of Cyclophosphamide). 3. **Prognostic Marker:** The most important prognostic factor in osteosarcoma is the **histologic response to neoadjuvant chemotherapy** (Huvos grade; >90% necrosis indicates a good prognosis). 4. **Radio-resistance:** Osteosarcoma is generally radio-resistant, making chemotherapy and surgery the mainstays of treatment.

Q: Which of the following statements is true regarding hemangioma of the bone?

Hamartomatous in origin.. **Explanation:** **Hemangioma of the bone** is a benign, slow-growing vascular lesion. The correct answer is **C** because these lesions are considered **hamartomatous** in origin—meaning they are a malformation of normal vascular tissue (capillary, cavernous, or venous) rather than a true neoplastic growth. **Analysis of Options:** * **Option A (Incorrect):** While hemangiomas can occur in the skull, the **vertebral column** (specifically the thoracic and lumbar spine) is the most common site, followed by the skull. * **Option B (Incorrect):** Hemangiomas are strictly **benign** and have no documented malignant potential. Most are asymptomatic and require observation only because they are harmless, not because they are premalignant. * **Option D (Incorrect):** They are relatively common incidental findings (found in ~10% of autopsies), but they account for only **0.7% to 1%** of all primary bone tumors, not 10-12%. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Signs:** * **Vertebra:** Shows a characteristic **"Jail-bar"** or **"Corduroy cloth"** appearance due to the thickening of vertical trabeculae. * **Skull:** Shows a classic **"Sunburst"** or **"Spoke-wheel"** pattern of trabeculation. * **Management:** Most are asymptomatic and require no treatment. If symptomatic (e.g., spinal cord compression), options include radiotherapy, embolization, or surgical decompression. * **Polka-dot Sign:** On CT scans of the vertebrae, the cross-section of thickened vertical trabeculae appears as multiple small dots.

Q: What is the most common bone involved in hemangioma?

Vertebrae. **Explanation:** **Hemangioma** is a benign, slow-growing vascular tumor characterized by the proliferation of blood vessels. It is the most common primary benign tumor of the spine. 1. **Why Vertebrae is Correct:** The **vertebral column** (specifically the thoracic and lumbar spine) is the most common site for skeletal hemangiomas. They are usually asymptomatic and discovered incidentally on imaging. Pathologically, they involve the replacement of bone marrow by vascular channels, leading to the characteristic **"Polka-dot" appearance** on axial CT scans and a **"Corduroy cloth" or "Jail-bar" appearance** (vertical striations) on lateral X-rays due to the thickening of remaining vertical trabeculae. 2. **Why Other Options are Incorrect:** * **Femur and Tibia:** While these are common sites for other bone tumors like Osteoid Osteoma or Osteosarcoma, they are rare sites for hemangiomas. When hemangiomas occur in long bones, they are often located in the craniofacial bones (skull) rather than the appendicular skeleton. * **Pelvis:** Although the pelvis contains significant marrow, it is a much less frequent site for hemangiomas compared to the axial skeleton (spine and skull). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Vertebrae (Thoracic > Lumbar). * **Second most common site:** Skull (Calvarium). * **Radiological Signs:** "Jail-bar" appearance (X-ray), "Polka-dot" sign (CT), and high signal intensity on both T1 and T2 weighted images (MRI) due to fat content. * **Management:** Most are asymptomatic and require no treatment. Symptomatic cases (causing cord compression) may require radiotherapy, embolization, or surgery.

Q: Which of the following is NOT an epiphyseal tumor?

Simple bone cyst. The location of a bone tumor relative to the growth plate (epiphysis, metaphysis, or diaphysis) is a high-yield diagnostic marker in orthopaedics. ### **Explanation of the Correct Answer** **D. Simple Bone Cyst (SBC):** This is a **metaphyseal** lesion. SBCs (also known as Unicameral Bone Cysts) typically occur in the proximal humerus or femur of children. They originate near the growth plate in the metaphysis and "migrate" toward the diaphysis as the bone grows. They are never primarily epiphyseal. ### **Analysis of Incorrect Options (Epiphyseal Tumors)** The epiphysis is an uncommon site for tumors; therefore, the few that occur there are frequently tested: * **A. Chondroblastoma:** The classic epiphyseal tumor in children/adolescents (before physeal closure). It is often referred to as "Codman’s tumor." * **B. Osteoclastoma (Giant Cell Tumor):** The most common epiphyseal tumor in adults (after physeal closure). It characteristically extends from the metaphysis into the epiphysis up to the subchondral bone. * **C. Clear Cell Chondrosarcoma:** A rare, low-grade malignant variant of chondrosarcoma that specifically involves the epiphysis of long bones (often the femoral head), mimicking a GCT or chondroblastoma. ### **NEET-PG High-Yield Pearls** * **Mnemonic for Epiphyseal Lesions:** "**C**-**G**-**C**" (**C**hondroblastoma, **G**iant Cell Tumor, **C**lear Cell Chondrosarcoma). * **Age Distinction:** If the physis is **open** (child) → Chondroblastoma; if the physis is **closed** (adult) → Giant Cell Tumor. * **SBC Radiographic Sign:** Look for the **"Fallen Leaf Sign"** (a pathological fracture where a cortical fragment settles at the bottom of the fluid-filled cyst). * **Diaphyseal Tumors:** Remember **Ewing’s Sarcoma**, Osteoid Osteoma, and Adamantinoma.

Q: A 25-year-old male presents with right knee swelling of one month duration. A radiograph is provided. Which of the following statements is true regarding this condition?

All of the above.. ***All of the above.*** - All three statements accurately describe **osteosarcoma**, the most common primary bone malignancy in young males presenting with knee swelling. - The combination of being a **bone-forming malignant tumor**, showing **Codman's triangle** on radiographs, and having propensity for **pulmonary metastasis** are classic features of osteosarcoma. *It is a bone-forming primary malignant tumor of bone.* - **Osteosarcoma** is indeed the most common primary **bone-forming malignant tumor**, typically affecting the **metaphysis** of long bones. - It predominantly occurs in **adolescents and young adults** (10-25 years), especially around the **knee** (distal femur, proximal tibia). *Codman's triangle can be seen.* - **Codman's triangle** is a classic radiographic sign formed by **elevated periosteum** at the edge of a bone lesion, commonly seen in osteosarcoma. - It represents **reactive new bone formation** where the periosteum is lifted by the underlying aggressive tumor growth. *Hematogenous spread with lung metastasis are common.* - **Pulmonary metastasis** occurs in approximately **80-90%** of osteosarcoma cases via **hematogenous spread**. - **Chest CT** is mandatory in staging as **lung metastases** significantly affect prognosis and treatment planning.

Q: Which of the following bones is not a common site for metastasis?

Fibula. **Explanation:** Bone is the third most common site for distant metastasis (after the lung and liver). Metastatic cells typically seed in areas with high **red bone marrow** content and rich vascularity. **1. Why Fibula is the correct answer:** The **Fibula** is a rare site for metastasis. In adults, red marrow is primarily replaced by yellow (fatty) marrow in the distal parts of the appendicular skeleton. The fibula has relatively low vascularity and minimal red marrow compared to the axial skeleton and proximal long bones, making it an unfavorable environment for circulating tumor cells to lodge and proliferate. **2. Analysis of Incorrect Options:** * **Spine (Option D):** This is the **most common** site for bone metastasis overall. The presence of the **Batson’s venous plexus** (a valveless system) allows direct retrograde spread of tumor cells from the pelvic organs (e.g., prostate) to the vertebral column. * **Femur (Option A):** The proximal femur is the second most common site for skeletal metastasis. It contains significant hematopoietic marrow. * **Humerus (Option B):** Along with the femur, the proximal humerus is a frequent site for appendicular metastasis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common primary cancers** spreading to bone: **P**rostate, **B**reast, **L**ung, **K**idney, **T**hyroid (Mnemonic: **PB-KTL** / "Lead Kettle"). * **Most common site:** Spine > Pelvis > Femur > Humerus. * **Acral Metastasis:** Metastasis to the hands or feet is extremely rare and is most commonly associated with **Lung Cancer**. * **Blastic vs. Lytic:** Prostate cancer typically causes osteoblastic (sclerotic) lesions, while Kidney and Thyroid cancers cause purely osteolytic lesions.

Q: Arrange the following tumors according to the increasing age they affect: 1. Ewings sarcoma 2. Osteosarcoma 3. Osteoclastoma 4. Multiple Myeloma

1-2-3-4. The age of presentation is a high-yield diagnostic clue in orthopaedic oncology. Bone tumors follow a predictable chronological pattern based on skeletal maturity and cellular activity. ### **1. Explanation of the Correct Sequence (1-2-3-4)** The correct order follows the natural progression from childhood to old age: * **Ewing’s Sarcoma (5–15 years):** Primarily affects children and young adolescents. It arises from neuroectodermal cells in the diaphysis of long bones. * **Osteosarcoma (10–25 years):** The most common primary malignant bone tumor, peaking during the adolescent growth spurt (puberty) when osteoblastic activity is maximal. * **Osteoclastoma (Giant Cell Tumor) (20–40 years):** Occurs after epiphyseal closure in young adults. It is a characteristic epiphyseal tumor. * **Multiple Myeloma (>50–60 years):** A plasma cell dyscrasia and the most common primary bone malignancy overall in adults, rarely seen before age 40. ### **2. Why Other Options are Incorrect** * **Option A & C:** These place Osteosarcoma or Multiple Myeloma before Ewing’s Sarcoma. Ewing’s is classically the "youngest" malignant bone tumor in this list. * **Option D:** This incorrectly places Multiple Myeloma before Osteoclastoma. Multiple Myeloma is a disease of the elderly, whereas GCT (Osteoclastoma) is a disease of the "skeletally mature" young adult. ### **3. NEET-PG High-Yield Clinical Pearls** * **Ewing’s Sarcoma:** Look for "Onion-peel" periosteal reaction and $t(11;22)$ translocation. * **Osteosarcoma:** Look for "Sunburst" appearance and Codman’s triangle; usually involves the metaphysis. * **Osteoclastoma:** Characterized by "Soap-bubble" appearance on X-ray; it is the only tumor that consistently involves the **epiphysis**. * **Multiple Myeloma:** Look for "Punched-out" lytic lesions and a "M-spike" on serum electrophoresis. **Note:** Bone scans are usually negative in Multiple Myeloma (cold scan).

Question 1

A 28-year-old female presents to the clinic with a complaint of dull, aching pain in her left hand after accidentally striking her finger against a door frame. On physical examination, there is mild tenderness over the affected area, but the range of m otion is preserved. An X -ray of the hand is shown below. Based on the clinical presentation and radiographic findings, what is the most likely diagnosis?

Accepted Answer

Enchondroma

Answer

Giant cell tumor

Answer

Brown tumor

Answer

Aneurysmal bone cyst

Question 2

A 9-year-old child presents with pain and swelling over the mid -shaft of the tibia, associated with low -grade fever and an elevated erythrocyte sedimentation rate (ESR). An X-ray of the affected limb is shown below. Based on the clinical features and radiographic findings, what is the most likely diagnosis?

Accepted Answer

Ewing sarcoma

Answer

Osteosarcoma

Answer

Acute osteomyelitis

Answer

Osteoid osteoma

Question 3

A 16-year-old boy presents with a 3-month history of progressively worsening pain and swelling around the distal right femur. Plain radiograph shows a permeative lytic lesion with Codman's triangle and a sunburst periosteal reaction. A core needle biopsy is performed and the histopathological specimen is shown in Image 1. Following staging workup, imaging confirms the lesion is confined to the bone with no skip lesions and no distant metastases. What is the most appropriate next step in management?

Accepted Answer

A. Neoadjuvant chemotherapy followed by wide surgical resection and adjuvant chemotherapy

Answer

B. Immediate wide surgical resection followed by adjuvant radiotherapy alone

Answer

C. Curettage, bone grafting, and adjuvant bisphosphonate therapy

Answer

D. Radiotherapy as definitive treatment followed by surveillance imaging

Question 4

In the treatment of osteosarcoma, all of the following chemotherapy agents are used EXCEPT:

Accepted Answer

Vincristine

Answer

High dose methotrexate

Answer

Cyclophosphamide

Answer

Doxorubicin

Question 5

Which of the following statements is true regarding hemangioma of the bone?

Accepted Answer

Hamartomatous in origin.

Answer

Occurs commonly in skull bones.

Answer

Requires observation as it is premalignant.

Answer

Forms 10-12% of bone tumors.

Question 6

What is the most common bone involved in hemangioma?

Accepted Answer

Vertebrae

Answer

Femur

Answer

Tibia

Answer

Pelvis

Question 7

Which of the following is NOT an epiphyseal tumor?

Accepted Answer

Simple bone cyst

Answer

Chondroblastoma

Answer

Osteoclastoma

Answer

Clear cell chondrosarcoma

Question 8

A 25-year-old male presents with right knee swelling of one month duration. A radiograph is provided. Which of the following statements is true regarding this condition?

Accepted Answer

All of the above.

Answer

It is a bone-forming primary malignant tumor of bone.

Answer

Codman's triangle can be seen.

Answer

Hematogenous spread with lung metastasis are common.

Question 9

Which of the following bones is not a common site for metastasis?

Accepted Answer

Fibula

Answer

Femur

Answer

Humerus

Answer

Spine

Question 10

Arrange the following tumors according to the increasing age they affect: 1. Ewings sarcoma 2. Osteosarcoma 3. Osteoclastoma 4. Multiple Myeloma

Accepted Answer

1-2-3-4

Answer

2-3-1-4

Answer

4-2-1-3

Answer

1-2-4-3

Bone Tumors — MCQs

Bone Tumors — MCQs

On this page

Practice by Chapter

Want unlimited practice?