Metastatic Bone Disease — MCQs
An elderly woman presented with confusion, thirst, and abdominal pain symptoms. On examination, she had pallor and thoracic spine tenderness. X-ray spine showed osteolytic lesions. Her lab investigations showed the following findings. What is the most likely diagnosis? - Hb - 6.9 g/dl
What is the most common primary source of metastatic bone tumors in males?
Distant bone metastases can be best detected by which of the following imaging techniques?
Through which route does prostate cancer primarily spread to the vertebral column?
Commonest cause of skeletal metastasis is
The most common site of metastasis in neuroblastoma is?
Which of the following is the first-line management for postmenopausal women with osteoporosis?
A 60 -year-old female presents with pain in her back of recent onset, which has become severe of late. During the course of investigations, she was found to have lytic lesions in the vertebrae and ribs. Which of the following organs should be carefully screened now for detecting the primary cause of these lesions?
A 45-year-old woman who underwent a modified radical mastectomy 4 years ago and was treated for multiple bone metastases with cyclophosphamide, doxorubicin, and fluorouracil for 6 months is complaining of exertional dyspnea, swelling of the legs, and periorbital edema in the morning. On examination, she has bilateral rales in the lungs, and her cardiovascular examination reveals a palpable S1, S2, S3, and S4 gallop. Her blood pressure is 149/117 mmHg, pulse rate is 80/min, and respiratory rate is 18/min. What is the most likely cause of her cardiac condition?
Gamma rays are used in which diagnostic modality?
Metastatic Bone Disease Indian Medical PG Practice Questions and MCQs
Question 1: An elderly woman presented with confusion, thirst, and abdominal pain symptoms. On examination, she had pallor and thoracic spine tenderness. X-ray spine showed osteolytic lesions. Her lab investigations showed the following findings. What is the most likely diagnosis? - Hb - 6.9 g/dl
- A. Vertebral compression fracture
- B. Metastatic carcinoma
- C. Osteoporosis
- D. Multiple myeloma (Correct Answer)
Explanation: ***Multiple myeloma*** - The combination of **osteolytic lesions** (bone pain, tenderness), **hypercalcemia** (confusion, thirst), **anemia** (Hb 69 g/dl, pallor), and **renal insufficiency** (confusion, thirst from dehydration) is highly suggestive of **multiple myeloma** [1]. - This plasma cell malignancy leads to excessive production of monoclonal antibodies and bone destruction [1]. *Vertebral compression fracture* - While **thoracic spine tenderness** and osteolytic lesions could be a component, it doesn't fully explain the systemic symptoms such as **anemia**, **confusion**, and **hypercalcemia**. - A simple compression fracture would not account for the profound **anemia** (Hb 69 g/dl) seen in this patient. *Metastatic carcinoma* - While metastatic carcinoma can cause **osteolytic lesions**, **anemia**, and sometimes **hypercalcemia**, the specific constellation of symptoms, particularly the severity of anemia and rapid progression, makes **multiple myeloma** a more fitting diagnosis. - Absence of primary tumor indicates that it is not a metastatic disease [1]. *Osteoporosis* - **Osteoporosis** can cause vertebral fractures and bone pain but typically does not lead to **osteolytic lesions**, **severe anemia**, or **hypercalcemia** [2]. - The bone changes in osteoporosis are primarily due to decreased bone density, not destructive lesions [2].
Question 2: What is the most common primary source of metastatic bone tumors in males?
- A. Liver
- B. Bone
- C. Brain
- D. Prostate (Correct Answer)
Explanation: ***Prostate*** - **Prostate cancer** is the most common primary source of metastatic bone tumors in males due to its high propensity to **metastasize to bone** and its high prevalence in the male population [1]. - These metastases are typically **osteoblastic**, causing increased bone density visible on imaging. *Liver* - While the **liver** can be a site of metastasis for many cancers, it is not a common primary source for **bone metastases** [2]. - Liver cancer (hepatocellular carcinoma) can metastasize, but bone is not its most frequent distant site. *Bone* - **Bone** itself can be the site of primary bone tumors, such as osteosarcoma or Ewing's sarcoma, but these are **not metastatic bone tumors** in the sense of originating elsewhere [3]. - When cancer originates in the bone, it is a primary bone cancer, not a metastatic one. *Brain* - **Brain tumors** (primary intracranial malignancies) generally have a **low propensity to metastasize** outside of the central nervous system. - While rare cases of brain tumor metastasis to bone can occur, it is not a common event or primary source.
Question 3: Distant bone metastases can be best detected by which of the following imaging techniques?
- A. Bone scan (Correct Answer)
- B. CT
- C. Intravenous venogram
- D. PET scan
Explanation: ***Bone scan*** - A **bone scan** is highly sensitive for detecting **osteoblastic activity**, which is characteristic of most bone metastases. - It involves injecting a **radioactive tracer** (usually technetium-99m methylene diphosphonate) that accumulates in areas of increased bone turnover, making it excellent for surveying the entire skeletal system. *PET scan* - While a **PET scan** (Positron Emission Tomography) can detect bone metastases, especially with **FDG-PET**, it is generally more expensive and may not be as sensitive for purely **osteoblastic lesions** as a bone scan. - Its primary role is often in assessing metabolic activity of the primary tumor and other distant soft tissue metastases. *CT* - **CT scans** (Computed Tomography) are excellent for assessing bone anatomy, cortical destruction, and soft tissue involvement, but they are generally less sensitive for detecting early or widespread **osseous metastatic disease** compared to a bone scan. - CT provides detailed anatomical information but may miss early **marrow involvement** that alters bone metabolism. *Intravenous venogram* - An **intravenous venogram** is an imaging technique used to visualize veins, primarily for detecting **thrombosis** or venous insufficiency. - It has no role in the detection of **bone metastases**, as it provides no information about bone structure or metabolic activity.
Question 4: Through which route does prostate cancer primarily spread to the vertebral column?
- A. None of the options
- B. Batson plexus (Correct Answer)
- C. Inferior hypogastric plexus
- D. Superior hypogastric plexus
Explanation: Batson plexus - The Batson plexus is a valveless network of veins that connects the deep pelvic veins (including those draining the prostate) to the internal vertebral venous plexuses. - The absence of valves in this plexus allows for the retrograde flow of tumor cells, facilitating the direct spread of prostate cancer to the vertebral column and other bones without passing through the pulmonary circulation. Inferior hypogastric plexus - The inferior hypogastric plexus is a nerve plexus containing sympathetic and parasympathetic fibers, primarily involved in innervating pelvic organs. - It is a neural structure, not a vascular pathway, and therefore does not play a direct role in the hematogenous spread of cancer cells. Superior hypogastric plexus - The superior hypogastric plexus is also a nerve plexus, located anterior to the sacral promontory, involved in autonomic innervation of pelvic organs. - Like the inferior hypogastric plexus, it is a neural structure and not a venous pathway for metastatic spread of cancer. None of the options - This option is incorrect because the Batson plexus is a well-established and critically important route for the metastatic spread of prostate cancer to the vertebral column. - The involvement of this valveless venous system is a hallmark in understanding the predilection of prostate cancer for bone metastases.
Question 5: Commonest cause of skeletal metastasis is
- A. Prostate
- B. Breast (Correct Answer)
- C. Thyroid
- D. Kidney
Explanation: ***Breast*** - **Breast cancer** is the most common cause of **skeletal metastasis** overall, especially in women, due to its high incidence and propensity to spread to bone. - Metastases often present as **osteolytic lesions**, sometimes mixed with osteoblastic features. *Prostate* - **Prostate cancer** is the most common cause of skeletal metastasis in **men**, frequently leading to **osteoblastic lesions**. - While very common in men, overall incidence is lower than breast cancer. *Thyroid* - **Thyroid cancer** can metastasize to bone, often presenting as **osteolytic lesions**, but it is less common than breast and prostate cancer. - Its overall contribution to skeletal metastases is significantly smaller. *Kidney* - **Renal cell carcinoma (RCC)** also metastasizes to bone, typically causing **osteolytic lesions** that can be highly vascular. - Similar to thyroid cancer, its incidence of bone metastasis is lower than that of breast and prostate cancer.
Question 6: The most common site of metastasis in neuroblastoma is?
- A. Lung
- B. Liver
- C. Lymph nodes
- D. Bone marrow (Correct Answer)
Explanation: ***Bone marrow*** - **Bone marrow** is the most common site of metastasis in neuroblastoma, occurring in more than half of all patients and being a primary determinant of prognosis. - Metastasis to the bone marrow often leads to **anemia**, **thrombocytopenia**, and sometimes **bone pain**. *Lung* - While possible, lung metastases are relatively **uncommon** in neuroblastoma, especially when compared to bone marrow involvement. - Lung metastases tend to occur in **later stages** or with specific genetic subtypes. *Liver* - Liver metastases, though seen, are more prevalent in **infants** with **Stage 4S neuroblastoma**, where the liver can be massively enlarged [1]. - This specific stage often has a **better prognosis** than other metastatic forms [1]. *Lymph nodes* - **Regional lymph node** involvement is common at diagnosis, but distant lymph node metastasis is less frequent than bone marrow involvement. - Involvement of regional lymph nodes does contribute to staging but is not the most frequent site of **distant metastasis**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, p. 486.
Question 7: Which of the following is the first-line management for postmenopausal women with osteoporosis?
- A. Calcitonin
- B. Raloxifene
- C. Tamoxifen
- D. Bisphosphonates (Correct Answer)
Explanation: ***Bisphosphonates*** - **Bisphosphonates** are the **first-line therapy** for postmenopausal osteoporosis due to their proven efficacy in reducing the risk of fragility fractures. - They work by **inhibiting osteoclast activity**, thereby decreasing bone resorption and increasing bone mineral density. *Calcitonin* - **Calcitonin** is a hormone that inhibits bone resorption, but its **anti-fracture efficacy is weaker** than bisphosphonates. - It is typically used as a **second-line agent** or for patients who cannot tolerate bisphosphonates, often for its analgesic effect in vertebral compression fractures. *Raloxifene* - **Raloxifene** is a **selective estrogen receptor modulator (SERM)** that mimics estrogen's beneficial effects on bone. - While it helps prevent vertebral fractures, it is **less effective than bisphosphonates** at preventing non-vertebral fractures and carries a risk of venous thromboembolism. *Tamoxifen* - **Tamoxifen** is also a **SERM**, primarily used in the treatment of **estrogen receptor-positive breast cancer**. - While it has **estrogen-like effects on bone** and can improve bone density, it is not approved or routinely used for the primary management of osteoporosis due to its other systemic effects and risks.
Question 8: A 60 -year-old female presents with pain in her back of recent onset, which has become severe of late. During the course of investigations, she was found to have lytic lesions in the vertebrae and ribs. Which of the following organs should be carefully screened now for detecting the primary cause of these lesions?
- A. Large intestine
- B. Breast (Correct Answer)
- C. Adrenal
- D. Small intestine
Explanation: **Breast** - **Breast cancer** is a common primary malignancy in women that frequently metastasizes to bone, causing **lytic lesions** in the vertebrae and ribs [4]. - The patient's age (60-year-old female) and the presence of severe, recent-onset back pain with multiple lytic lesions strongly suggest metastatic disease [2], with **breast cancer** being a top differential [4]. *Large intestine* - While **colorectal cancer** can metastasize to bone, it typically causes mixed lytic and blastic lesions or predominantly blastic lesions, rather than purely lytic lesions. - Furthermore, the frequency of bone metastases from colorectal cancer is generally lower compared to breast or lung primary tumors [1]. *Adrenal* - Primary **adrenal tumors** (e.g., adrenal cortical carcinoma, pheochromocytoma) rarely metastasize to bone and are not a common cause of diffuse lytic bone lesions. - Bone metastases from adrenal cancers are much less frequent and typically associated with advanced, aggressive disease [3]. *Small intestine* - **Small bowel malignancies** (e.g., adenocarcinomas, neuroendocrine tumors) rarely metastasize to bone. - When they do, the pattern of bone involvement is variable but less commonly presents as widespread lytic lesions in the spine and ribs without other systemic symptoms.
Question 9: A 45-year-old woman who underwent a modified radical mastectomy 4 years ago and was treated for multiple bone metastases with cyclophosphamide, doxorubicin, and fluorouracil for 6 months is complaining of exertional dyspnea, swelling of the legs, and periorbital edema in the morning. On examination, she has bilateral rales in the lungs, and her cardiovascular examination reveals a palpable S1, S2, S3, and S4 gallop. Her blood pressure is 149/117 mmHg, pulse rate is 80/min, and respiratory rate is 18/min. What is the most likely cause of her cardiac condition?
- A. Pneumonia
- B. Drug induced cardiac toxicity (Correct Answer)
- C. Cardiac involvement from metastasis or heart failure
- D. Systolic dysfunction due to heart failure secondary to drug toxicity
Explanation: ***Drug induced cardiac toxicity*** - The patient's history of treatment with **doxorubicin**, an **anthracycline**, is a significant risk factor for **dose-dependent cardiotoxicity**, which can manifest years after cessation of therapy. [1] - Symptoms like **exertional dyspnea**, **leg swelling**, **periorbital edema**, and findings such as **rales**, **hypertension**, and gallop rhythms (**S3 and S4**) are consistent with **heart failure** secondary to cardiotoxicity. [1] *Cardiac involvement from metastasis or heart failure* - While metastatic disease can involve the heart, it's less common for it to present as isolated **cardiac dysfunction** without other prominent metastatic symptoms, especially 4 years post-treatment. - Heart failure is present, but **drug toxicity** is the more specific and likely underlying cause given her treatment history, rather than a general term like "cardiac involvement from metastasis." *Pneumonia* - Although **rales** are present, there is no mention of fever, cough with sputum, or leukocytosis, which are typical signs of **pneumonia**. - The chronicity of symptoms (dyspnea, edema) and the presence of **S3 and S4 gallops** are more indicative of a **chronic cardiac condition** than an acute infection. [1] *Systolic dysfunction due to heart failure secondary to drug toxicity* - This option is partially correct but less comprehensive than "Drug induced cardiac toxicity." While **systolic dysfunction** and **heart failure** are consequences, "drug induced cardiac toxicity" is the direct and primary cause. [1] - The question asks for the "most likely cause of her cardiac condition," and the toxicity itself is the etiology leading to the dysfunction and failure.
Question 10: Gamma rays are used in which diagnostic modality?
- A. Fluoroscopy
- B. CT Scan
- C. MRI
- D. Bone scan (Correct Answer)
Explanation: ***Bone scan*** - **Bone scans** are a type of **nuclear medicine imaging** that uses **radiopharmaceuticals** (typically Tc-99m labeled compounds) that emit **gamma rays**, which are detected by a gamma camera to create images. - Gamma ray detection is the fundamental principle of **all nuclear medicine procedures** including SPECT, PET scans, thyroid scans, and renal scans. - This modality is particularly useful for detecting **bone metastases**, infections, and fractures due to the targeted uptake of the tracer. *Fluoroscopy* - **Fluoroscopy** utilizes continuous **X-rays** to produce real-time images of internal structures, often used for guiding procedures. - It does not involve the detection of gamma rays emitted from a patient. *CT Scan* - A **CT scan** (Computed Tomography) uses a rotating **X-ray tube** and detectors to create detailed cross-sectional images of the body. - While it uses X-rays, it does not detect gamma rays for image formation. *MRI* - **MRI** (Magnetic Resonance Imaging) uses strong **magnetic fields** and **radio waves** to generate detailed images of organs and soft tissues. - It operates on the principle of nuclear magnetic resonance and does not involve gamma rays at all.
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