Staging Systems — MCQs
Most sensitive modality for detecting bone metastases
Which of the following is not true about osteosarcoma?
Which statement is incorrect about the pathology of the bone tumor?
Classification system of bone tumors is -
Radiation-induced necrosis can be diagnosed by:
Which of the following stages of lip carcinoma does not have nodal involvement?
Which of the following is true about prostate cancer?
What is the most appropriate treatment for a soap bubble appearance at the lower end of the radius?
Which of the following are features of Gorham's disease (Disappearing Bones)?
Onion peel appearance on radiograph is not seen in which of the following conditions?
Staging Systems Indian Medical PG Practice Questions and MCQs
Question 1: Most sensitive modality for detecting bone metastases
- A. Bone scan
- B. PET-CT
- C. Plain radiograph
- D. MRI (Correct Answer)
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.
Question 2: 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)
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.
Question 3: Which statement is incorrect about the pathology of the bone tumor?
- A. Tumor has distinct margin
- B. Tumor arises from epiphyseal to metaphyseal region
- C. Eccentric lesion
- D. Chemotherapy is the treatment of choice for all bone tumors. (Correct Answer)
Explanation: ***Tumor has distinct margin*** - A **distinct margin** often indicates a benign tumor, while malignant tumors typically show **infiltrative margins**. - In bone tumors, particularly malignant ones, the lack of clear demarcation is a key pathological feature. *Chemotherapy is the treatment of choice* - While chemotherapy may be used for certain **malignant bone tumors**, it is not the first-line treatment for most bone tumors [1]. - The primary treatment is often **surgical excision**, especially for localized lesions [1]. *Tumor arise from epiphyseal to metaphyseal region* - While some tumors can originate in these areas, many actually arise from the **diaphyseal** region in bone tumors like osteosarcoma. - This option misrepresents the common locations where various tumors develop, as osteochondromas tend to develop near the epiphyses of limb bones [2]. *Eccentric lesion* - Many bone tumors do indeed present as **eccentric lesions**, especially benign ones like **osteochondromas**. - However, this feature does not apply universally, as some malignant tumors can also be **central or infiltrative** in nature. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 672-673.
Question 4: Classification system of bone tumors is -
- A. Enneking (Correct Answer)
- B. Edmonton
- C. TNM
- D. Manchester
Explanation: ***Enneking*** - The **Enneking staging system** is widely used for primary **bone tumors**, particularly sarcomas. - It classifies tumors based on their histological grade, local extension, and presence of metastases, which guides surgical planning and prognosis. *Edmonton* - The **Edmonton classification** is primarily used for **periprosthetic fractures** around hip and knee replacements. - It does not classify primary bone tumors but rather describes fracture patterns related to prosthetic implants. *TNM* - The **TNM (Tumor, Node, Metastasis)** classification is a general staging system used for many types of cancer, but it's not the primary system for bone tumors. - While applicable for some bone cancers, the **Enneking system** provides a more specific functional and anatomical assessment for limb-sparing surgery in bone sarcomas. *Manchester* - The **Manchester staging system** is primarily used for **lymphoma**, particularly Hodgkin lymphoma. - It describes the extent of lymph node involvement and extralymphatic disease, completely unrelated to bone tumors.
Question 5: Radiation-induced necrosis can be diagnosed by:
- A. MRI
- B. CT
- C. PET
- D. Biopsy (Correct Answer)
Explanation: ***Biopsy*** - A **biopsy** is the definitive diagnostic method for radiation-induced necrosis, allowing for histological examination of tissue to confirm necrosis and rule out residual or recurrent tumor. [1], [2] - It provides a direct view of cellular changes, identifying **necrosis, atypical cells**, and ruling out **malignancy**. *MRI* - While **MRI** can show structural changes indicative of necrosis (e.g., mass effect, edema), it often cannot definitively differentiate between **radiation necrosis** and **tumor recurrence.** [2] - It often shows **T1 hypointensity** and **T2 hyperintensity**, but these findings are not specific. *CT* - **CT scans** are useful for detecting gross changes like **mass effect** and **edema** but have limited sensitivity for distinguishing necrosis from tumor recurrence. - It may show **low-density lesions** but lacks the resolution and specificity for precise diagnosis. *PET* - **PET scans** measure metabolic activity and can help distinguish between **tumor recurrence** (high uptake) and **radiation necrosis** (low uptake) in some cases. - However, false positives can occur, as some inflammatory processes in necrosis can also show increased uptake, making it **less definitive** than a biopsy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1307-1308. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 340-341.
Question 6: Which of the following stages of lip carcinoma does not have nodal involvement?
- A. T2N1
- B. T3N0 (Correct Answer)
- C. T2N2
- D. T1N1
Explanation: ***T3N0*** - The **'N' classification** in the TNM staging system refers to **nodal involvement**. A stage with **'N0' indicates no regional lymph node metastasis**. - A **T3 lesion** signifies a large primary tumor, but if it's accompanied by **N0**, it means there's no evidence of spread to the lymph nodes. *T2N1* - The **'N1' classification** indicates the presence of **regional lymph node metastasis**, specifically in a **single ipsilateral lymph node** that is 3 cm or less in its greatest dimension. - This stage therefore **does have nodal involvement**, contradicting the premise of the question. *T2N2* - The **'N2' classification** signifies more advanced regional lymph node metastasis, such as a **single ipsilateral lymph node** greater than 3 cm but not more than 6 cm. - It could also refer to **multiple ipsilateral lymph nodes**, none greater than 6 cm, or bilateral/contralateral lymph nodes, none greater than 6 cm. In all these cases, **nodal involvement is present**. *T1N1* - Similar to T2N1, the **'N1' component** in T1N1 indicates the presence of **regional lymph node metastasis** in a single ipsilateral lymph node of 3 cm or less. - Therefore, this stage **does involve nodal spread**, despite having a smaller primary tumor (T1).
Question 7: Which of the following is true about prostate cancer?
- A. Most common region involved is central zone
- B. It is not a hormone dependent cancer
- C. Most common type is squamous cell Carcinoma
- D. Grading is based on Gleason score (Correct Answer)
Explanation: ***Grading is based on Gleason score*** - The **Gleason score** is a widely used system to grade the aggressiveness of prostate cancer based on its microscopic appearance [1]. - It assesses the architectural patterns of the tumor, assigning a grade from 1 to 5 to the two most prevalent patterns, which are then summed to yield a final score (ranging from 2-10), indicating the **prognosis** and guiding treatment [1]. *Most common region involved is central zone* - The most common region for prostate cancer to develop is the **peripheral zone**, accounting for about 70-80% of cases [1]. - The **central zone** accounts for less than 5% of prostate cancers. *It is not a hormone dependent cancer* - Prostate cancer is largely a **hormone-dependent cancer**, with its growth stimulated by androgens like testosterone [1]. - **Androgen deprivation therapy (ADT)** is a cornerstone of prostate cancer treatment, demonstrating its dependency on hormones [1]. *Most common type is squamous cell Carcinoma* - The most common type of prostate cancer is **adenocarcinoma**, which originates from the glandular cells of the prostate [1]. - **Squamous cell carcinoma** of the prostate is exceedingly rare, accounting for less than 1% of all prostate malignancies. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 988-994.
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
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.
Question 9: Which of the following are features of Gorham's disease (Disappearing Bones)?
- A. Progressive disappearance of bone associated with multiple hemangiomatosis or multiple lymphangiectasis
- B. Usually the progression involves contiguous bones, but occasionally multiple sites are affected
- C. Patients present with mild pain or with pathological fracture
- D. All of the above (Correct Answer)
Explanation: **Gorham’s Disease**, also known as **Vanishing Bone Disease** or Phantom Bone Disease, is a rare musculoskeletal condition characterized by the spontaneous, progressive destruction and resorption of bone tissue. ### **Explanation of Options** * **Option A:** The hallmark of Gorham’s disease is the proliferation of thin-walled vascular or lymphatic channels within the bone. This leads to **progressive osteolysis** (bone disappearance) associated with **hemangiomatosis** or **lymphangiectasis**. The bone is replaced by fibrous connective tissue. * **Option B:** The disease typically spreads across joints to involve **contiguous bones** (e.g., spreading from the humerus to the scapula or from one vertebra to the next). While localized, it can occasionally manifest in multiple non-contiguous anatomical sites. * **Option C:** The clinical presentation is often insidious. Patients may experience **dull aching pain**, localized swelling, or a **pathological fracture** following minor trauma. In severe cases involving the ribs or spine, it can lead to chylothorax. Since all statements accurately describe the pathophysiology, progression, and clinical presentation of the disease, **Option D (All of the above)** is the correct answer. ### **High-Yield Clinical Pearls for NEET-PG** * **Radiology:** Characterized by "tapering" of the ends of remaining bone (sucker-stick appearance) and eventual complete disappearance of the bone shadow. * **Key Feature:** Unlike most bone tumors, Gorham’s disease **crosses joint spaces** to involve adjacent bones. * **Biopsy:** Shows non-malignant proliferation of thin-walled vessels; there is a notable **absence of osteoclasts** (the resorption is mediated by the vascular tissue). * **Complication:** **Chylothorax** is a life-threatening complication if the disease involves the thoracic cage.
Question 10: Onion peel appearance on radiograph is not seen in which of the following conditions?
- A. Garre's osteomyelitis
- B. Ewing's sarcoma
- C. Osteogenic sarcoma
- D. Fibrous dysplasia (Correct Answer)
Explanation: **Explanation:** The "onion peel" appearance (lamellated periosteal reaction) is a radiographic sign caused by the rhythmic or episodic lifting of the periosteum, leading to the deposition of multiple concentric layers of new bone. **1. Why Fibrous Dysplasia is the Correct Answer:** Fibrous dysplasia is a benign fibro-osseous lesion where normal bone is replaced by fibrous tissue and immature trabeculae. It is an **intramedullary** process that does not typically involve the periosteum. Therefore, it does not produce a periosteal reaction. Its classic radiographic appearance is described as **"Ground-glass opacification"** with a well-defined "rind" of sclerotic bone. **2. Analysis of Incorrect Options:** * **Ewing’s Sarcoma:** This is the classic association for onion peel appearance. The aggressive nature of this tumor causes rapid, successive layers of periosteal bone formation. * **Garre’s Osteomyelitis:** Also known as Chronic Sclerosing Osteomyelitis with proliferative periostitis. It is a low-grade chronic infection (often in the mandible) that stimulates the periosteum to form reactive peripheral bone in a lamellated pattern. * **Osteogenic Sarcoma (Osteosarcoma):** While "Sunburst" and "Codman’s triangle" are more common, Osteosarcoma is a highly aggressive tumor that can occasionally present with a lamellated (onion peel) appearance depending on the rate of tumor growth. **Clinical Pearls for NEET-PG:** * **Onion Peel Appearance:** Seen in Ewing’s sarcoma, Garre’s osteomyelitis, Osteosarcoma, and sometimes Langerhans Cell Histiocytosis (LCH). * **Ground Glass Appearance:** Pathognomonic for Fibrous Dysplasia. * **Sunburst/Sunray Appearance:** Highly suggestive of Osteosarcoma. * **Codman’s Triangle:** Indicates an aggressive process (malignancy or subperiosteal abscess) lifting the periosteum rapidly.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free