Radiological Anatomy — MCQs

Radiological Anatomy Indian Medical PG Practice Questions and MCQs

Question 201: What is the investigation of choice for nasopharyngeal angiofibroma?

A. Contrast-enhanced CT (Correct Answer)
B. Plain CT
C. X-ray
D. MRI

Explanation: ***Contrast-enhanced CT*** - A **contrast-enhanced CT** scan is the investigation of choice for **nasopharyngeal angiofibroma** due to its ability to clearly delineate the extent of the tumor, its vascularity, and its bony involvement. - The contrast highlights the **highly vascular nature** of the angiofibroma, which is crucial for surgical planning and embolization. *X-ray* - **X-rays** provide limited detail of soft tissue structures and mass lesions in the complex anatomy of the nasopharynx. - They are generally not sensitive enough to characterize a tumor like **angiofibroma** or determine its exact extent. *Plain CT* - A **plain CT** (non-contrast CT) can show soft tissue masses and bony erosion but lacks the ability to assess the **vascularity** of the tumor. - Without contrast, it's difficult to differentiate the tumor from surrounding tissues or identify its blood supply, which is critical for **angiofibroma** management. *MRI* - While **MRI** offers excellent soft tissue contrast and is valuable for assessing intracranial extension or perineural spread, **contrast-enhanced CT** is generally preferred as the primary imaging modality for angiofibroma. - **CT with contrast** is superior for demonstrating **bony erosion** and the characteristic **vascularity** of this tumor.

Question 202: Which CT view is best for visualizing paranasal polyps?

A. Coronal view (Correct Answer)
B. Axial view
C. Sagittal view
D. 3D view

Explanation: ***Coronal*** - The **coronal view** provides the best visualization of the **ostia of the paranasal sinuses**, which are crucial for assessing the extent and obstruction caused by polyps. - This orientation effectively demonstrates whether polyps are **protruding into the nasal cavity** or obstructing the drainage pathways. *Axial view* - The axial view is useful for evaluating **posterior structures** and **bony erosion** but is less optimal for assessing the vertical extent of polyps or ostial obstruction. - It can show the **anteroposterior dimensions** of polyps but does not offer the same clarity for sinus outflow tracts as the coronal view. *Sagittal view* - The sagittal view is good for showing the **craniocaudal extent** of lesions and differentiating between the nasal cavity and sphenoid sinus, but it is not ideal for comprehensive paranasal sinus polyp evaluation. - It can help in localizing some polyps but does not provide a clear overview of **sinus ostia** or lateral extension. *3D view* - A 3D reconstruction can be helpful for a general overview and surgical planning but does not offer the fine detail and specific orientation needed for primary polyp detection and ostial assessment as effectively as direct 2D views. - It is a derived image rather than a primary acquisition plane and might obscure smaller polyps or subtle anatomical relationships.

Question 203: What is the best imaging view for assessing the nasal bone in X-ray?

A. Lateral (Correct Answer)
B. Towne's
C. Submentovertical
D. Caldwell

Explanation: ***Lateral*** - The **lateral view** provides a clear profile of the nasal bones, allowing for the best assessment of fractures, displacement, and angulation. - It visualizes the nasal bone in relation to other facial structures, which is crucial for treatment planning. *Towne's* - The **Towne's view** is primarily used to visualize the **occipital bone** and the **foramen magnum**, not the nasal bones. - It projects the petrous pyramids inferiorly, which would obstruct the view of the nasal region. *Caldwell* - The **Caldwell view** is primarily used to assess the **frontal sinuses**, **ethmoid sinuses**, and **orbits**. - While it offers some visualization of the nasal region, it does not provide the detailed lateral projection needed for optimal nasal bone assessment. *Submentovertical* - The **submentovertical view** (also known as the **basal view**) is primarily used to visualize the **base of the skull**, **sphenoid sinuses**, and **zygomatic arches**. - This view does not offer a direct or clear projection of the nasal bones themselves.

Question 204: Which of the following features is used to identify the colon on an X-ray?

A. Haustra (Correct Answer)
B. Valvulae conniventes
C. String of beads sign
D. More number of loops

Explanation: ***Haustra (Correct Answer)*** - **Haustra** are sacculations or pouches of the colon created by the uneven contraction of the **taeniae coli** - They are THE characteristic feature that helps distinguish the large bowel from the small bowel on an X-ray - These indentations typically do **not cross the entire width** of the bowel lumen, unlike the valvulae conniventes of the small intestine - Haustra appear as incomplete septations on plain radiographs *Valvulae conniventes (Incorrect)* - **Valvulae conniventes** (also known as plicae circulares) are large, circular folds of the **small intestine** mucosa that project into the lumen - They extend **completely across the lumen** of the small bowel, making them easily distinguishable from haustra which only partially traverse the colon - This is a feature of small bowel, not colon *String of beads sign (Incorrect)* - The "**string of beads sign**" is a **pathological radiographic finding** associated with small bowel obstruction - It refers to multiple small, gas-filled loops of small bowel stacked on top of each other, often with small pockets of fluid or air trapped between the folds, resembling beads on a string - This is not a normal anatomical feature used to identify the colon *More number of loops (Incorrect)* - The number of loops is **not a primary distinguishing feature** between the large and small bowel on an X-ray - While the small intestine generally has more convolutions or loops than the colon, this is a **less reliable and specific sign** compared to the presence of haustra - Haustra remain the gold standard feature for colon identification

Question 205: Popcorn calcification is seen in:

A. Pulmonary hamartoma (Correct Answer)
B. Bronchogenic carcinoma
C. Tuberculosis
D. Pulmonary metastases

Explanation: ***Pulmonary hamartoma*** - **Popcorn calcification** is a pathognomonic radiographic finding highly suggestive of **pulmonary hamartoma**, a **benign tumor** composed of cartilage, fat, and connective tissue - This characteristic calcification pattern is due to the presence of **chondroid (cartilaginous) tissue** within the lesion - Appears as coarse, irregular calcifications resembling popcorn on chest X-ray or CT scan *Bronchogenic carcinoma* - Malignant lung lesions typically show **irregular, spiculated, or ill-defined margins** and tend to grow rapidly - While calcification can occur in some lung malignancies, it usually appears as **eccentric, stippled, or amorphous** rather than the distinctive popcorn pattern - Popcorn calcification is not a feature of primary lung cancers *Tuberculosis* - **Granulomatous infections** such as tuberculosis often lead to calcification, but it usually presents as **laminated, clustered, or target-like patterns** in lymph nodes or within granulomas (Ghon lesion, Ranke complex) - **Popcorn calcification** is not a typical feature of active or healed tuberculous lesions *Pulmonary metastases* - **Metastatic lesions** are generally not calcified, although a few primary tumors (e.g., mucinous adenocarcinoma, osteosarcoma, chondrosarcoma) can metastasize as calcified nodules - When calcification is present in metastases, it is rarely in the specific **popcorn pattern** and is usually diffuse, punctate, or amorphous

Question 206: Rat tail appearance in contrast radiography is seen in?

A. Carcinoma esophagus
B. Plummer-Vinson syndrome
C. Diffuse esophageal spasms
D. Achalasia cardia (Correct Answer)

Explanation: ***Correct: Achalasia cardia*** - The **"rat tail" or "bird's beak" sign** is the classic radiological appearance of **achalasia cardia** on barium swallow study - Shows **smooth, symmetrical, tapered narrowing** of the distal esophagus with proximal esophageal dilatation - Due to **failure of the lower esophageal sphincter (LES) to relax**, causing functional obstruction - The smooth tapering distinguishes it from irregular narrowing seen in malignancy *Incorrect: Carcinoma esophagus* - Esophageal carcinoma shows **"shouldered lesion"** or **"apple core" appearance** - Characterized by **irregular, shelf-like margins** with abrupt transition - Narrowing is **asymmetric and irregular**, not the smooth tapering of rat tail sign - May show mucosal destruction and filling defects *Incorrect: Plummer-Vinson syndrome* - Shows **postcricoid web** in the upper esophagus on barium swallow - Associated with iron deficiency anemia, glossitis, and increased risk of esophageal cancer - Presents as a thin, web-like membrane rather than distal narrowing *Incorrect: Diffuse esophageal spasms* - Shows **"corkscrew esophagus"** or **"rosary bead" appearance** on barium swallow - Multiple, **simultaneous, non-peristaltic contractions** create segmented appearance - Dynamic finding with normal segments between contractions - Represents uncoordinated muscular activity, not fixed narrowing

Question 207: Which chamber enlargement shows a double right heart border with a wide subcarinal angle?

A. Left atrium (Correct Answer)
B. Left ventricle
C. Right atrium
D. Right ventricle

Explanation: ***Left atrium*** - A **double right heart border** on a chest X-ray is a classic sign of **left atrial enlargement**, as the enlarged left atrium bulges into the right atrial silhouette. - The **wide subcarinal angle** (angle between the mainstem bronchi) also indicates left atrial enlargement, as the expanding left atrium pushes the bronchi apart. *Left ventricle* - **Left ventricular enlargement** primarily manifests as a **downward and leftward displacement of the apex** and increased cardiac silhouette on the left. - It does not typically cause a double right heart border or widening of the subcarinal angle. *Right atrium* - **Right atrial enlargement** usually presents as a **prominent right heart border** that extends further to the right than normal. - It does not result in a double right heart border or affect the subcarinal angle. *Right ventricle* - **Right ventricular enlargement** leads to an **anterior bowing of the sternum** (in severe cases) and an upward and leftward displacement of the cardiac apex. - It pushes the left ventricle posteriorly and does not produce a double right heart border or a wide subcarinal angle.

Question 208: Which of the following appears the same on both T1 and T2 weighted MRI sequences?

A. Gall bladder
B. Fat (Correct Answer)
C. Kidney
D. CSF

Explanation: ***Fat*** - On both T1 and T2 weighted MRI sequences, fat appears **bright** (high signal intensity). - This consistent bright signal makes fat a useful internal reference point for signal interpretation. *Gall bladder* - The gall bladder is filled with **bile**, which appears bright on T2-weighted images due to its high water content, but can be variable on T1. - Bile does not maintain consistently the **same signal intensity** as fat on both sequences. *Kidney* - The renal parenchyma typically has **intermediate signal intensity** on both T1 and T2, but its signal characteristics are different from the consistently bright signal of fat. - The signal can vary depending on the specific sequence parameters and hydration status, unlike fat. *CSF* - **Cerebrospinal fluid (CSF)** appears dark (low signal) on T1-weighted images and bright (high signal) on T2-weighted images due to its high water content. - This distinct signal intensity difference between T1 and T2 is contrary to the shared bright appearance of fat on both sequences.

Question 209: Which among the following is false regarding small bowel appearance on abdominal radiograph?

A. Peripheral distribution (Correct Answer)
B. Solid faeces are absent
C. Valvulae conniventes are present
D. Radius of curvature is small

Explanation: ***Peripheral distribution*** - The small bowel is typically located **centrally** in the abdomen, while the large bowel is more peripherally distributed. - A peripheral distribution suggests the presence of **large bowel** on an abdominal radiograph, not small bowel. *Valvulae conniventes are present* - **Valvulae conniventes** (also known as plicae circulares) are characteristic folds of the small bowel mucosa that extend across the entire lumen. - Their presence helps distinguish the small bowel from the large bowel on imaging. *Radius of curvature is small* - The small bowel loops tend to have a **smaller radius of curvature** compared to the large bowel, which often forms wider, more sweeping loops. - This feature assists in differentiating bowel segments on an abdominal radiograph. *Solid faeces are absent* - The small bowel primarily contains fluid and gas, and the presence of **solid faeces** is characteristic of the large bowel. - Absence of solid faeces is an expected finding when visualizing the small bowel.

Question 210: To visualize vascular sling causing tracheal or external airway compression, which of the following would you best prefer?

A. MRI
B. CT (Correct Answer)
C. Catheter angiography of aorta and pulmonary artery
D. PET-CT

Explanation: ***Correct: CT (CT Angiography)*** - **CT angiography is the gold standard** for diagnosing vascular rings and slings causing airway compression - Provides **excellent spatial resolution** with multiplanar and 3D reconstruction capabilities to clearly demonstrate the anatomical relationship between anomalous vessels and the trachea/bronchi - **Fast acquisition time** minimizes motion artifacts, particularly important in pediatric patients who are the typical population affected by vascular slings - Superior for **surgical planning** due to detailed visualization of vascular anatomy and the exact site and degree of airway compression - More readily available and cost-effective compared to MRI for this specific indication *Incorrect: MRI* - While MRI provides excellent soft tissue contrast and avoids ionizing radiation, it has **longer acquisition times** leading to increased risk of motion artifacts, especially in children - Lower spatial resolution compared to CT for vascular structures - May be used as a **complementary modality** when radiation avoidance is critical or for follow-up imaging, but not the first-line preferred modality *Incorrect: Catheter angiography of aorta and pulmonary artery* - **Invasive procedure** with associated risks including vascular injury, bleeding, and contrast reactions - Provides excellent vascular detail but **no information about airway compression** or surrounding soft tissue structures - Reserved for cases requiring **intervention** (embolization, stent placement) or when non-invasive imaging is inconclusive - Has been largely replaced by non-invasive CTA for diagnostic purposes *Incorrect: PET-CT* - Primarily assesses **metabolic activity**, used for oncology staging, infection, and inflammatory conditions - **Not indicated** for structural vascular anomalies or their anatomical relationships to airways - Does not provide the necessary vascular or airway detail for evaluating vascular slings

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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