Radiological Anatomy — MCQs

Radiological Anatomy Indian Medical PG Practice Questions and MCQs

Question 131: Identify the defect shown in the X-ray skull:

A. Crew cut appearance
B. Punched out lytic lesions
C. Widened sella turcica
D. Pepper pot skull (Correct Answer)

Explanation: ***Pepper pot skull*** - The image exhibits a diffuse punctate or granular demineralization of the skull, resembling a "pepper pot." This appearance is characteristic of **hyperparathyroidism**, where excessive parathyroid hormone leads to increased osteoclastic activity and trabecular bone loss, leaving behind small, lucent areas. - This pattern results from widespread erosions of the **cortical bone** and trabeculae throughout the skull, creating a mottled, finely granular or punctate radiolucency. *Crew cut appearance* - A "crew cut" or "hair-on-end" appearance is typically seen in patients with severe, chronic **hemolytic anemias**, such as **thalassemia major** and **sickle cell anemia**. - It results from extreme marrow hyperplasia, causing expansion of the diploic space and thinning of the outer cortical bone, leading to spiculation perpendicular to the skull surface. *Punched out lytic lesions* - "Punched out lytic lesions" are well-demarcated, rounded radiolucencies without a sclerotic border, classically associated with **multiple myeloma**. - These lesions represent areas of osteolysis caused by plasma cell infiltration and are typically larger and more discrete than the fine granular appearance seen in a "pepper pot skull." *Widened sella turcica* - A widened sella turcica is usually indicative of an intrasellar mass, most commonly a **pituitary adenoma**, or can be due to hydrocephalus. - This finding focuses specifically on the sella region and does not describe the diffuse, granular demineralization seen throughout the entire skull vault in the image.

Question 132: The X-ray of the patient shows?

A. Rickets
B. Hemarthrosis
C. Scurvy (Correct Answer)
D. Sun burst appearance

Explanation: ***Scurvy*** - The X-ray images display classical findings of scurvy, including a **dense metaphyseal line** (white line of Frankel), **lucent zone beneath the metaphysis** (Trümmerfeld zone), and **epiphyseal separation** due to capillary fragility. - The findings are particularly evident at the distal ends of the femur and proximal tibia, consistent with **subperiosteal hemorrhages** and impaired osteoid formation characteristic of **vitamin C deficiency**. *Rickets* - Rickets is characterized by **widening, cupping, and fraying of the metaphyses**, often accompanied by **growth plate widening** and bowing of long bones due to defective mineralization of bone matrix. - These features are not the predominant findings in the provided X-rays, which show distinct abnormalities related to hemorrhage and bone fragility. *Hemarthrosis* - Hemarthrosis refers to bleeding into a joint space, often characterized by **joint effusions** and possibly **bone erosions** if chronic, typically seen in conditions like hemophilia. - While subperiosteal hemorrhages are present in scurvy, the X-ray findings are broader than just intra-articular bleeding and include specific metaphyseal changes. *Sun burst appearance* - A "sunburst appearance" is a classic radiographic finding often associated with aggressive **bone tumors** like **osteosarcoma**, indicating **spiculated periosteal reaction** extending perpendicularly from the bone cortex. - This pattern is absent in the provided X-rays, which show signs of metabolic bone disease rather than a primary bone tumor.

Question 133: What is shown in this skull X-ray?

A. Pepper pot skull (Correct Answer)
B. Artifacts
C. Silver-beaten appearance
D. Hair-on-end appearance

Explanation: ***Pepper pot skull*** - The X-ray image displays a classic "pepper pot" appearance, characterized by diffuse **punctate lucencies** evenly distributed throughout the skull vault, resembling numerous small holes. - This finding is highly suggestive of **hyperparathyroidism**, where excessive parathyroid hormone leads to increased bone resorption, visible as demineralization and multiple small lytic lesions. *Artifacts* - **Artifacts** are extraneous marks or distortions on an image that do not represent true anatomical structures. - The observed pattern is a consistent, diffuse change in bone density, indicating a **pathological condition** rather than a technical error or imaging artifact. *Silver-beaten appearance* - A "silver-beaten" or **convolutional impression** refers to the undulating pattern on the inner table of the skull caused by increased **intracranial pressure** in children. - This appearance is characterized by broad, shallow indentations, which is distinct from the multiple small, sharply defined lucencies seen in pepper pot skull. *Hair-on-end appearance* - The **hair-on-end** or "crew-cut" appearance shows **perpendicular bony trabeculae** radiating outward from the skull vault, creating a spiculated pattern. - This finding is classically associated with **chronic hemolytic anemias** (thalassemia, sickle cell disease) due to marrow hyperplasia, not the diffuse lucencies seen here.

Question 134: The following pattern in CT scan shown below can occur due to spread from:

A. Lymphatics
B. Bronchial vein
C. Pulmonary artery (Correct Answer)
D. All of the above

Explanation: ***Pulmonary artery*** - The CT scan demonstrates a **miliary pattern** with numerous small (1-3mm), discrete nodules showing **random distribution** throughout both lungs - This random distribution is the hallmark of **hematogenous spread via the pulmonary arteries** - When pathogens or tumor cells reach the pulmonary arteries (from right heart or systemic venous circulation), they disseminate uniformly throughout lung parenchyma - Classic examples include **miliary tuberculosis** and **hematogenous metastases** (thyroid, renal, melanoma) *Lymphatics* - Lymphatic spread produces a **perilymphatic distribution**, NOT a miliary/random pattern - Nodules appear along lymphatic pathways: peribronchovascular bundles, interlobular septa, and subpleural regions - Creates a characteristic beaded or nodular appearance along lymphatic routes - Seen in **sarcoidosis** and **lymphangitic carcinomatosis**, which do NOT present with miliary patterns *Bronchial vein* - Bronchial veins drain deoxygenated blood from bronchial walls to the systemic circulation (azygos/hemiazygos system) - This is NOT a recognized pathway for producing miliary lung nodules in standard radiology literature - Miliary patterns specifically refer to pulmonary arterial hematogenous dissemination *All of the above* - Incorrect: The miliary pattern is specifically caused by **pulmonary artery spread only** - The random distribution seen in the image is pathognomonic for hematogenous spread via pulmonary arteries, not lymphatic or bronchial venous routes

Question 135: Which of the following will be the most probable diagnostic finding in the patient with X-Ray skull shown below?

A. Elevated SAP
B. CD1A positivity (Correct Answer)
C. Bence Jones proteins
D. Elevated HbA2

Explanation: ***CD1A positivity*** - The skull X-ray shows multiple punched-out lytic lesions without sclerotic borders, characteristic of **Langerhans Cell Histiocytosis (LCH)**. - **Langerhans cells** in LCH express surface markers like **CD1a** and S100 protein, which are diagnostic when detected via **immunohistochemistry on tissue biopsy**. - CD1a positivity is the **gold standard** for confirming LCH diagnosis. *Elevated SAP* - **Serum Alkaline Phosphatase (SAP)** is typically elevated in conditions with increased osteoblastic activity or liver/biliary disease. - LCH lesions are generally **lytic** and not associated with increased osteoblastic activity, thus SAP elevation is not a specific or common finding. *Bence Jones proteins* - **Bence Jones proteins** (monoclonal light chains) are found in the urine of patients with **Multiple Myeloma**, which can also cause lytic bone lesions. - However, the image shows more discrete, "punched-out" lesions typical of LCH, whereas myeloma lesions are often more diffuse or "salt-and-pepper" in appearance, and LCH does not secrete Bence Jones proteins. *Elevated HbA2* - **Elevated HbA2** is a characteristic finding in **beta-thalassemia trait**, a genetic blood disorder. - There is no clinical or radiological indication in the provided image or question to suggest a connection to thalassemia.

Question 136: Which artery is labeled as '3' in the given angiogram?

A. Posterior cerebral artery (Correct Answer)
B. Anterior cerebral artery
C. Middle cerebral artery
D. Basilar artery

Explanation: ***Posterior cerebral artery*** - The arrow labeled '3' points to the **posterior cerebral artery (PCA)**, which originates from the **basilar artery** and supplies the posterior cerebral hemispheres. - This artery is a key component of the **Circle of Willis**, responsible for perfusing the **occipital lobes**, parts of the temporal lobes, and midbrain. - The PCA courses laterally around the midbrain after branching from the basilar artery terminus. *Anterior cerebral artery* - The ACA arises from the internal carotid artery and courses **medially** above the optic chiasm. - It supplies the **medial surfaces** of the frontal and parietal lobes, not the posterior structures shown at position 3. *Middle cerebral artery* - The MCA is the **largest branch** of the internal carotid artery and courses **laterally** through the Sylvian fissure. - It supplies the **lateral convexities** of the cerebral hemispheres, not the posterior circulation shown at position 3. *Basilar artery* - The basilar artery is formed by the **confluence of the vertebral arteries** and runs along the **ventral pons**. - It is a **midline structure** that gives rise to the PCAs, rather than being the lateral branch shown at position 3.

Question 137: The following image shows:

A. Water's view
B. Orthopantomogram (Correct Answer)
C. Invertogram
D. Gynogram

Explanation: ***Orthopantomogram*** - The image displays a panoramic view of the upper and lower jaws, including all teeth, the temporomandibular joints, and surrounding bone structures, which is characteristic of an **Orthopantomogram (OPG)** or panoramic radiograph. - This type of radiograph is commonly used in dentistry to assess the overall dental status, detect **impacted teeth**, and evaluate **bone pathology** across the entire oral cavity. *Water's view* - A **Water's view** (occipitomental view) is a radiographic projection typically used to visualize the maxilla, sinuses (especially the maxillary sinuses), and orbits. - It does not provide a panoramic view of the entire dental arches as seen in the image. *Invertogram* - An **invertogram** is a specialized lateral radiographic view of the abdomen and pelvis, particularly positioned to show the anus and rectum. - It is primarily used to assess **anorectal malformations** in infants and has no relation to dental imaging. *Gynogram* - The term **gynogram** is not a standard or recognized medical imaging technique. - Imaging studies related to gynecological conditions typically involve ultrasound, MRI, or CT scans of the pelvis, not a specific "gynogram" X-ray.

Question 138: The following X-ray abdomen is diagnostic of:

A. Toxic megacolon
B. Intestinal obstruction
C. Perforation peritonitis (Correct Answer)
D. Chronic mesenteric insufficiency

Explanation: ***Perforation peritonitis*** - The X-ray image shows widespread **free air under the diaphragm** and dilated loops of bowel with **air-fluid levels**, which are classic signs of **perforation peritonitis**. - **Free intraperitoneal air** (pneumoperitoneum) is a strong indicator of a perforated hollow viscus, leading to peritonitis. *Toxic megacolon* - Characterized by **extreme dilatation of the colon** (typically >6 cm in transverse colon) with loss of haustral markings on plain film, without free air. - While it can lead to perforation, the primary finding here is *free air*, not just colitis and colonic dilation. *Intestinal obstruction* - Identified by multiple **dilated bowel loops proximal to the obstruction**, with **air-fluid levels**, and a relative absence of gas distally. - While there are dilated loops and air-fluid levels, the most prominent finding of **free air under the diaphragm** is not typically associated with an uncomplicated obstruction. *Chronic mesenteric insufficiency* - This condition involves **reduced blood flow to the intestines**, leading to chronic abdominal pain, especially postprandial, and weight loss. - Its radiographic signs are often non-specific or involve bowel wall thickening and pneumatosis, not free air or acute findings of perforation.

Question 139: Comment on the diagnosis based on the skull and vertebral changes shown in the radiological image below:

A. Thalassemia (Correct Answer)
B. Rickets
C. Osteopetrosis
D. Hyperparathyroidism

Explanation: ***Thalassemia*** - The skull X-ray shows prominent **"hair-on-end" appearance** due to widening of the diploic space and thinning of the outer table, characteristic of chronic erythroid hyperplasia in thalassemia. - The vertebral bodies show a **"fishmouth" or "codfish" deformity**, a sign of severe osteopenia and bone marrow expansion commonly seen in thalassemia. *Rickets* - Rickets primarily affects the **growth plates** in children, leading to wide, irregular growth plates, cupping, and fraying of metaphyses, which are not seen here. - While it causes bone softening, the specific cranial and vertebral changes observed, like **"hair-on-end"** or "fishmouth" vertebrae, are not typical of rickets. *Osteopetrosis* - Osteopetrosis is characterized by **increased bone density** (sclerotic bones) due to defective osteoclast function, leading to abnormally thick and dense bones. - The radiographs show **osteopenia** and bone marrow expansion, which is the opposite of what is seen in osteopetrosis. *Hyperparathyroidism* - Hyperparathyroidism typically causes **subperiosteal bone resorption**, especially in the phalanges, and sometimes **brown tumors**. - While it can lead to generalized osteopenia, the specific "hair-on-end" skull and "fishmouth" vertebrae are not hallmark features; **salt-and-pepper skull** may be present, which differs from the findings here.

Question 140: What is the radiological sign demonstrated in the image provided?

A. Cobblestone appearance (Correct Answer)
B. Belt sign
C. String sign
D. Coffee bean sign

Explanation: ***Cobblestone appearance*** - The image shows a **barium study** of the small bowel, revealing an irregular, nodular mucosal pattern, which is characteristic of the **cobblestone appearance**. - This appearance is typically seen in **Crohn's disease** due to deep ulcerations crisscrossing with edematous, inflamed mucosa. - The combination of **linear ulcers** and **transverse fissures** separated by areas of edematous mucosa creates this distinctive pattern. *Belt sign* - The **belt sign** is a radiological finding on **CT imaging** associated with **blunt abdominal trauma**, particularly **seat belt injuries**. - It refers to bowel wall thickening, mesenteric hematoma, or abdominal wall bruising in the distribution of a seat belt. - This sign is not observed in the gastrointestinal barium study pattern shown in this image. *String sign* - The **string sign** is also seen in Crohn's disease but refers to a **severely narrowed or stenotic bowel lumen**, appearing as a thin, continuous string of barium. - This occurs due to chronic inflammation leading to fibrotic strictures. - While Crohn's can cause both findings, the image prominently displays the nodular, irregular mucosal pattern rather than a simple string-like narrowing. *Coffee bean sign* - The **coffee bean sign** is a classic radiographic finding in **sigmoid volvulus** on plain abdominal X-ray. - A massively dilated, gas-filled loop of bowel creates an appearance resembling a coffee bean. - This sign is distinct from the intestinal mucosal pattern observed in the provided barium study.

Practice by Chapter

Radiographic Anatomy of Skull and Face

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Radiographic Anatomy of Spine

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Radiographic Anatomy of Chest

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Radiographic Anatomy of Abdomen

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Radiographic Anatomy of Extremities

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Cross-sectional Anatomy: Brain and Head

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Cross-sectional Anatomy: Neck

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Cross-sectional Anatomy: Thorax

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Cross-sectional Anatomy: Abdomen and Pelvis

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Vascular Anatomy

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Developmental Anatomy Variations

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Anatomic Landmarks for Interventional Procedures

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