Radiological Anatomy — MCQs

Radiological Anatomy Indian Medical PG Practice Questions and MCQs

Question 151: Number of carpal bones seen in a radiograph of an infant is:

A. 5
B. 3
C. 0
D. 2 (Correct Answer)

Explanation: ***Correct: 2*** - During infancy, only the **capitate** and **hamate** carpals have begun to ossify and are visible on X-rays. - The remaining carpal bones ossify at later ages during childhood. - This is the expected finding in a normal infant radiograph. *Incorrect: 5* - Five carpal bones are usually visible in radiographs of children around **1 year of age**, but not typically in infants. - This number would imply significant early ossification beyond what is expected at birth. *Incorrect: 3* - Three carpal bones might be visible in later infancy or early childhood, but not typically at birth. - The **triquetrum** is usually the third carpal bone to ossify (around 2-3 years). *Incorrect: 0* - It is uncommon for **zero carpal bones** to be visible in a radiograph of a healthy infant. - The **capitate and hamate** are usually present at birth or shortly after, making zero an unlikely finding.

Question 152: Left cardiac border bulge can be seen in all, except -

A. Enlarged azygous vein (Correct Answer)
B. Coronary artery aneurysm
C. Left atrial enlargement
D. Pericardial defect

Explanation: ***Enlarged azygous vein*** - An enlarged azygous vein typically presents as a widening of the **right paratracheal stripe** on a frontal chest X-ray, or a mass in the **right tracheobronchial angle**. - It does not project onto the **left cardiac border** and is therefore not associated with a left-sided bulge. *Coronary artery aneurysm* - A large **coronary artery aneurysm**, particularly of the left main or left anterior descending artery, can manifest as a localized bulge along the **left heart border**. - This is due to the expansion of the artery, which can project outwards from the cardiac silhouette. *Left atrial enlargement* - Severe **left atrial enlargement** can push the left ventricle inferiorly and anteriorly, causing a bulge along the **upper left cardiac border**. - On a chest X-ray, this is often seen as a **\"double density\" sign** or an outward convexity of the left atrial appendage. *Pericardial defect* - A congenital or acquired **pericardial defect**, especially on the left side, can allow the heart to herniate or shift to the left. - This displacement can lead to a visible **left cardiac bulge** due to the repositioning of cardiac chambers or structures within the chest cavity.

Question 153: The perorbital view is carried out for -

A. Petrous apex
B. Internal auditory meatus (Correct Answer)
C. Mastoid process
D. Bilateral mastoid pathologies

Explanation: ***Internal auditory meatus*** - The **perorbital view** (also known as the **Stenvers view**) is specifically used to visualize the internal auditory meatus. - This projection helps in assessing the internal auditory canal for conditions such as **acoustic neuromas** or other lesions that may affect the **auditory and facial nerves**. *Petrous apex* - While the petrous apex is part of the temporal bone, it is better visualized by other projections like the **submentovertex (SMV)** view or specialized CT/MRI scans. - The perorbital view's primary focus is on the **internal auditory meatus** rather than the entire petrous apex. *Bilateral mastoid pathologies* - Bilateral mastoid pathologies are typically assessed using views like the **Schuller's view** or **Law's view**, which provide better visualization of the **mastoid air cells** and their involvement. - The perorbital view is not optimized for comprehensively evaluating **bilateral mastoid processes**. *Mastoid process* - The mastoid process, a part of the temporal bone, is usually best seen on different projections such as the **Law's view** or **Schuller's view**. - The perorbital view provides only a limited and often obscured view of the **mastoid process** due to its specific angulation for the internal auditory meatus.

Question 154: The Transorbital view is carried out for:

A. Internal auditory meatus
B. Mastoid process
C. Optic canal (Correct Answer)
D. Bilateral mastoid pathology

Explanation: ***Optic canal*** - The **Transorbital (or Rhese)** view in radiography is specifically designed to visualize the **optic canal (optic foramen)**. - This projection uses an oblique angle through the orbit to provide a clear view of the optic canal without superimposition from other dense bone structures. - The optic canal transmits the optic nerve and ophthalmic artery, making its visualization clinically important in cases of trauma, tumors, or suspected optic nerve pathology. *Internal auditory meatus* - The **internal auditory meatus (IAM)** is best visualized using **Stenvers view** or **Pöschl view**, which are specifically designed to project the petrous portion of the temporal bone. - These views provide optimal demonstration of the IAM, which transmits the facial nerve (CN VII) and vestibulocochlear nerve (CN VIII). - The transorbital view does not adequately demonstrate the IAM due to its different anatomical focus. *Mastoid process* - The **mastoid process** is typically visualized using views like **Schuller's view** or **Law's view**, which are specifically tailored to show the mastoid air cells and bony contours. - The transorbital view does not optimally demonstrate the mastoid process; instead, it focuses on anterior skull base structures. *Bilateral mastoid pathology* - Evaluating **bilateral mastoid pathology** would require views that clearly show both mastoids, such as a **Townes view** or specialized mastoid projections like **dual Schuller's views**. - The transorbital view is a unilateral projection primarily focused on the optic canal rather than a comprehensive bilateral assessment of the mastoids.

Question 155: Which term describes the internal appearance of a lesion?

A. Pedunculated
B. Mixed density (Correct Answer)
C. Circular
D. Discoid

Explanation: ***Mixed density*** - **Mixed density** refers to a lesion that consists of both solid and cystic components, or areas of different tissue attenuation, which describes its **internal appearance**. - This term is commonly used in **imaging studies** (e.g., CT, MRI) to characterize the internal composition of a mass or lesion. *Pedunculated* - **Pedunculated** describes a lesion that is attached to a surface by a **stalk-like structure**. - This term refers to the **external shape** or attachment of a lesion, not its internal composition. *Circular* - **Circular** describes the **external shape** of a lesion when viewed from a certain angle, indicating a rounded or disc-like outline. - It does not provide information about the **internal characteristics** or contents of the lesion. *Discoid* - **Discoid** describes a lesion that is **flat and disk-shaped** or roundish with a flattened or slightly raised surface. - This term characterizes the **overall external morphology** of a lesion, not its internal structure or density.

Question 156: The tear drop sign on imaging is characteristically associated with:

A. Retinoblastoma
B. Congenital nasolacrimal duct obstruction
C. Orbital floor fracture (Correct Answer)
D. Dry eyes

Explanation: ***floor of orbit*** - A **tear-drop sign** on imaging, particularly in X-rays or CT scans, is characteristic of a **blow-out fracture** of the orbit, specifically involving the **inferior orbital wall (floor)**. - The "tear-drop" appearance is created by the herniation of **orbital soft tissues (fat and/or inferior rectus muscle)** into the maxillary sinus through the fractured orbital floor. *Retinoblastoma* - Retinoblastoma is a **malignant tumor of the retina** in children, typically presenting with **leukocoria (white pupillary reflex)**, strabismus, or vision changes. - While imaging (CT or MRI) can show an intraocular mass with calcifications, it does not typically produce a "tear-drop sign." *Congenital nasolacrimal duct obstruction* - This condition presents with chronic **tearing (epiphora)** and discharge in infants due to failure of the nasolacrimal duct to open. - Imaging is usually not required for diagnosis, and when performed, it would not show a "tear-drop sign" but might reveal a dilated lacrimal sac. *Dry eyes* - Dry eyes (keratoconjunctivitis sicca) involve insufficient tear production or excessive tear evaporation, leading to ocular discomfort, burning, and foreign body sensation. - Diagnosis is clinical, involving tests like the **Schirmer test** or fluorescein staining, and it has no associated "tear-drop sign" on imaging.

Question 157: Earliest sign of left atrial enlargement is -

A. Widening of carinal angle
B. Posterior displacement of esophagus (Correct Answer)
C. Elevation of left bronchus
D. Double shadow of right border

Explanation: ***Posterior displacement of esophagus*** - As the **left atrium enlarges**, it expands posteriorly, pushing against the **esophagus**, which is anatomically located directly behind the left atrium. - This displacement can be visualized early on a **lateral chest X-ray** or during a **barium swallow study**, making it an early radiological sign. *Widening of carinal angle* - **Left atrial enlargement** can eventually lead to a widened **carinal angle** (the angle where the trachea bifurcates into the main bronchi), but this often indicates more significant enlargement. - This sign is often seen later as the expanding atrium pushes the **left main stem bronchus** superiorly and laterally. *Elevation of left bronchus* - **Elevation of the left main stem bronchus** is a sign of left atrial enlargement, but it is typically a later finding than the posterior displacement of the esophagus. - It occurs as the greatly enlarged left atrium pushes the **bronchus upwards**. *Double shadow of right border* - A **double shadow of the right cardiac border** (also known as a "double density" or "double contour") is a classic sign of significant left atrial enlargement on a **PA chest X-ray**. - This occurs when the enlarged left atrium bulges to the right, creating an additional shadow superimposed on the normal right heart border, indicating **advanced enlargement**.

Question 158: The best view to visualize zygomatic arches is

A. Skull PA view
B. Jug Handle view (Correct Answer)
C. Orthopantamogram
D. Occipito mental view

Explanation: ***Jug Handle view*** - The **Jug Handle view**, also known as the **submentovertex (SMV) view**, is optimal for visualizing the entire course of both **zygomatic arches**, projecting them free from superimposition by other facial bones. - This projection requires the patient's head to be tilted back so that the central ray passes through the neck and enters the skull vertically, allowing for a clear, unobstructed image of the arches. *Skull PA view* - A **PA (posteroanterior) skull view** primarily demonstrates the frontal bone, orbits, and nasal cavity. - While it shows portions of the zygoma, the **zygomatic arches are often superimposed** by other cranial structures, making detailed assessment difficult. *Orthopantamogram* - An **Orthopantamogram (OPG)** is a panoramic dental X-ray that provides a broad view of the maxilla, mandible, and temporomandibular joints. - It offers a **limited or distorted view of the zygomatic arches**, as its primary purpose is dental assessment, not detailed facial bone evaluation. *Occipito mental view* - The **occipitomental view**, also known as the **Waters' view**, is excellent for visualizing the **maxillary sinuses**, orbits, and nasal bones. - While it shows the **zygomaticomaxillary complex**, it does not provide a true tangential projection of the entire zygomatic arch, which is often partially obscured by other structures.

Question 159: Investigation of choice for vascular ring around airway:

A. PET
B. Catheter directed angiography
C. MRI
D. CT (Correct Answer)

Explanation: ***CT*** - **CT angiography (CTA)** is the **investigation of choice** for diagnosing vascular rings due to its ability to provide detailed anatomical visualization of the great vessels and their relationship to the trachea and esophagus. - It offers high spatial resolution, allowing precise identification of the type of vascular anomaly, the degree of **airway and esophageal compression**, and guiding surgical planning. *PET* - **PET scans** are primarily used for assessing **metabolic activity**, particularly in oncology or to evaluate organ function, and do not provide sufficient anatomical detail for vascular rings. - While it can detect metabolically active lesions, it is **not suitable** for visualizing the structural abnormalities of blood vessels and their compressive effects on the airway. *Catheter directed angiography* - **Catheter-directed angiography** is an **invasive procedure** involving radiation and contrast, primarily used for assessing blood flow dynamics, identifying stenosis, or guiding interventions. - While it can visualize vessels, CTA is **less invasive**, provides comparable or superior anatomical detail for vascular rings, and is generally preferred for initial diagnosis. *MRI* - **MRI** can provide good soft tissue contrast and visualize vascular structures without radiation, but it is often **less readily available** and can be more challenging for pediatric patients due to the need for sedation and longer scan times. - For comprehensive anatomical detail including bone and calcifications, and in patients who might struggle with breath-holding, **CT angiography** often offers clearer and more consistent images of complex vascular anatomy.

Question 160: Double atrial shadow in mitral stenosis due to -

A. Right Atrial enlargement
B. Right Atrium appendages
C. Left Atrial enlargement (Correct Answer)
D. Tumor in Right Atrium

Explanation: ***Left Atrial enlargement*** - **Mitral stenosis** obstructs blood flow from the left atrium to the left ventricle, leading to increased pressure and **enlargement of the left atrium**. - On a chest X-ray, this enlarged left atrium can cause a **"double atrial shadow"** or **"double contour"** sign, where the right border of the enlarged left atrium is seen through the right atrium, creating a double density along the right heart border. - This is the **classic radiological sign** of left atrial enlargement in mitral stenosis. *Right Atrial enlargement* - **Right atrial enlargement** is typically associated with conditions like **pulmonary hypertension** or **tricuspid valve disease**, not primarily mitral stenosis. - Right atrial enlargement does not cause the characteristic **"double atrial shadow"** seen in mitral stenosis, which specifically represents the enlarged left atrium projecting through the right heart border. *Right Atrium appendages* - **Right atrial appendages** are normal anatomical structures and do not cause a double atrial shadow. - The **"double atrial shadow"** is specifically a radiological manifestation of **left atrial enlargement**, not related to normal right atrial anatomy. *Tumor in Right Atrium* - A **right atrial tumor** is a rare finding and not a consequence of **mitral stenosis**. - While a tumor could cause an abnormal cardiac silhouette, it would not produce the characteristic **"double atrial shadow"** sign, which is specifically due to **left atrial enlargement**.

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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