Radiological Anatomy Practice Questions

Q: All are seen in acromegaly except for which of the following?

Anterior scalloping of vertebrae. ***Anterior scalloping of vertebrae*** - **Anterior vertebral scalloping** is not typically seen in acromegaly. It is more characteristic of conditions causing **aneurysmal dilatation of the aorta** or **neurofibromatosis**. - Acromegaly primarily affects bone and soft tissue growth due to excess **Growth Hormone (GH)**, leading to widespread changes, but not specific anterior vertebral erosions from bony overgrowth. *Posterior scalloping of vertebrae* - **Posterior vertebral scalloping** is a feature seen in acromegaly due to the enlargement of **spinal canal contents** or overgrowth of soft tissues in the spinal canal. - The excess **growth hormone** can cause hypertrophy of ligaments and other soft tissues, leading to pressure erosion on the posterior vertebral bodies. *Chondrocalcinosis* - **Chondrocalcinosis** (calcification of articular cartilage) is a common radiological finding in acromegaly, particularly in the **knees and hips**. - It results from altered cartilage metabolism and increased **calcium deposition** due to prolonged exposure to high levels of **growth hormone and IGF-1**. *Calcification of pinna* - **Calcification of the pinna** (auricular cartilage) is a recognized though less common feature of acromegaly due to deposition of **calcium salts** in the cartilaginous structures. - The exact mechanism is not fully understood but is believed to be related to the metabolic derangements and widespread connective tissue changes induced by **excess growth hormone**.

Q: Which of the following can be detected radiographically?

Interproximal caries. ***Interproximal caries*** - Radiography, particularly **bitewing radiographs**, is the **gold standard** for detecting interproximal caries that cannot be visualized clinically - Interproximal caries appears as a **radiolucent (dark) area** in the enamel and/or dentin between adjacent teeth - Radiographs can detect caries **before clinical examination** reveals cavitation, allowing for early intervention - The demineralization process reduces tissue density, making it appear darker on radiographs compared to healthy tooth structure *Root caries* - Root caries CAN be detected radiographically, appearing as **saucer-shaped radiolucencies** at the cervical region - However, root caries may be **easier to detect clinically** than interproximal caries since root surfaces are more accessible to direct visualization - Radiographic detection is still valuable, especially for subgingival root caries *Deep caries* - Deep caries CAN be detected radiographically as **extensive radiolucent areas** extending deep into dentin - However, the term "deep caries" refers to the **extent** rather than location, and can often be detected clinically - Radiographs help assess the **proximity to the pulp** and extent of involvement **Key Point:** While all three types of caries can be detected radiographically, **interproximal caries** is the type most dependent on radiographic detection since these areas cannot be directly visualized clinically between tooth contacts.

Q: The 'steeple sign' on X-ray neck (as shown in the image) is characteristically seen in which of the following diseases?

Croup. ***Croup*** - The image suggests a **steeple sign** on the X-ray neck, which corresponds to the subglottic narrowing characteristic of croup. - Croup, primarily caused by **parainfluenza virus**, leads to inflammation and edema below the vocal cords reducing the airway. *Epiglottitis* - Epiglottitis is characterized by a **"thumb sign"** on lateral neck X-ray, indicating a swollen epiglottis. - Patients with epiglottitis typically present with rapidly progressing airway obstruction, high fever, and drooling, unlike the gradual onset and barking cough of croup. *Laryngomalacia* - Laryngomalacia involves the **collapse of supraglottic structures** during inspiration, causing inspiratory stridor. - It would not typically present with the subglottic narrowing seen in the image, but rather with dynamic airway changes visualized during endoscopy. *Bronchiolitis* - Bronchiolitis involves inflammation of the **small airways (bronchioles)** and is usually diagnosed clinically, with chest X-rays showing hyperinflation or peribronchial cuffing if at all. - It primarily affects the lower respiratory tract and would not produce findings like the steeple sign on a neck X-ray.

Q: The right border of the heart in a chest X-ray is formed by which of the following?

Right atrium. ***Right atrium*** - The **right atrium** forms the major portion of the heart's **right cardiac border** on a standard posteroanterior (PA) chest X-ray. - Its position allows it to be the most lateral structure on the right side of the heart silhouette. *Right ventricle* - The **right ventricle** primarily forms the **anterior surface** of the heart. - While it contributes to the anterior cardiac outline, it rarely forms the right border on a PA chest X-ray unless there is significant enlargement. *Pulmonary artery* - The **pulmonary artery** typically forms the **left upper cardiac border** in the region below the aortic knob. - It does not contribute to the right border of the heart. *Superior vena cava* - The **superior vena cava (SVC)** lies superior and medial to the right atrium. - It forms part of the **right superior mediastinal border**, but not the actual right border of the heart itself.

Q: The 'water lily sign' is characteristic of which condition?

Hydatid cyst of lung. ***Hydatid cyst of lung*** - The **'water lily sign'** in an **echinococcal cyst** (hydatid cyst) occurs when the **endocyst** ruptures and collapses, detaching from the pericyst. - This detached membrane floats within the cyst fluid, creating a characteristic appearance on imaging that resembles a water lily. *Aspergilloma lung* - An **aspergilloma (fungus ball)** is typically seen as a mobile mass within a pre-existing cavitary lesion, often associated with a **crescentic lucency (air crescent sign)**. - It does not present with the specific appearance of floating membranes seen in the 'water lily sign'. *Tuberculosis* - **Tuberculosis (TB)** in the lung can cause various imaging findings, including **cavitation**, consolidation, and nodules. - However, it does not typically produce the 'water lily sign', which is specific to parasitic cysts. *Silicosis* - **Silicosis** is a pneumoconiosis characterized by **multiple small nodules** in the upper lung fields and can lead to **progressive massive fibrosis**. - Its imaging findings are distinct and do not include the 'water lily sign'.

Q: The "raindrop skull" appearance is associated with which of the following conditions?

Multiple Myeloma. ***Multiple Myeloma*** - The **\"raindrop skull\"** appearance on X-ray is characteristic of multiple myeloma, resulting from numerous small, **punched-out lytic lesions** in the skull. - These lytic lesions are caused by the proliferation of **plasma cells** in the bone marrow, leading to localized bone destruction. *Hemophilia* - Hemophilia is a **bleeding disorder** caused by a deficiency in clotting factors and does not directly cause lytic bone lesions or a raindrop skull appearance. - While it can lead to **hemarthrosis** and other bleeding-related bone changes, these are distinct from the lytic lesions seen in myeloma. *Thalassemia* - Thalassemia is a **genetic blood disorder** characterized by abnormal hemoglobin production, leading to **anemia**. - Severe thalassemia can cause bone changes (e.g., **\"hair-on-end\" skull** due to marrow hyperplasia), but not the discrete lytic lesions of a raindrop skull. *Hodgkin's lymphoma* - Hodgkin's lymphoma is a **lymphatic system cancer** that can cause bone lesions, but these are typically **sclerotic** or mixed lytic/sclerotic, not the purely lytic, punched-out lesions characteristic of a raindrop skull. - Bone involvement in Hodgkin's is less common than in non-Hodgkin's lymphoma and usually presents differently.

Q: Which among the following has the least HU units?

Air. ***Air*** - **Air** has an HU value of **-1000**, which is the lowest possible value on the Hounsfield scale. - This low attenuation is due to the very low density of air, allowing almost all X-rays to pass through without significant interaction. *Acute hemorrhage* - **Acute hemorrhage** appears *hyperdense* on CT, with HU values typically ranging from **+40 to +90**. - This higher density is due to the protein content of blood and the hemoglobin within red blood cells. *Iodinated contrast agents* - **Iodinated contrast agents** are designed to significantly increase the attenuation of X-rays, leading to very high HU values, often in the range of **+100 to +300** or more, depending on concentration and location. - The high atomic number of iodine atoms results in strong X-ray absorption. *Subcutaneous fat* - **Subcutaneous fat** has HU values generally in the range of **-50 to -150**. - While lower than most soft tissues and acute hemorrhage, these values are still significantly higher than that of air.

Q: Apex of the lung is best assessed by

Lordotic view. ***Lordotic view*** - The **lordotic view** is a specialized chest X-ray projection specifically designed to visualize the **lung apices** clearly by projecting the clavicles superiorly. - This view is achieved by leaning the patient backward (lordotic position) while the X-ray beam is angled, or by angling the X-ray tube itself superiorly. *AP view* - The **AP (Anteroposterior) view** often projects the **clavicles over the lung apices**, obscuring them and making thorough assessment difficult. - This general chest X-ray view is primarily used when the patient cannot stand or sits upright for a PA view. *PA view* - Similar to the AP view, the standard **PA (Posteroanterior) view** can also have the **clavicles superimpose the lung apices**, making subtle apical pathology hard to detect. - While a routine chest X-ray, it's not optimal for detailed evaluation of the uppermost lung regions. *Oblique view* - **Oblique views** are primarily used to separate superimposed structures or to better visualize specific areas that are obscured in standard AP or PA views, but they are not the best for the apices. - They are often employed to assess the pleura, hilum, or specific lung segments by rotating the patient.

Q: String of beads sign is seen in:

Genital TB. ***Genital TB*** - The "string of beads sign" in **genital tuberculosis** refers to the characteristic appearance of multiple small, nodular lesions along the **fallopian tube** on **hysterosalpingography (HSG)**. - This results from **alternating areas of stricture and dilatation** due to chronic **tuberculous salpingitis** with granulomatous inflammation. - Among tuberculosis manifestations, this sign is specifically associated with female genital TB. - **Note:** The "string of beads" sign is also classically seen in **fibromuscular dysplasia of renal arteries**, but in the context of tuberculosis, it refers to genital TB. *Gastroduodenal TB* - Gastroduodenal TB typically manifests as ulcers, strictures, or mass lesions in the stomach or duodenum. - The "string of beads sign" is not a characteristic finding for tuberculosis in this location. *Spinal tuberculosis* - Spinal tuberculosis (Pott's disease) primarily affects the vertebrae, leading to vertebral collapse, kyphosis, and paraspinal abscesses. - Imaging shows vertebral destruction, disc space narrowing, and paravertebral soft tissue shadows. - The "string of beads sign" is not associated with spinal TB. *Ileocaecal TB* - Ileocaecal TB commonly presents with bowel wall thickening, ulcerations, strictures, and lymphadenopathy. - While strictures can occur, the specific "string of beads sign" is not a recognized feature of ileocaecal TB.

Q: Which radiographic view is best for visualizing the frontal sinus?

Caldwell's view. ***Caldwell's view*** - This **posteroanterior (PA) radiographic projection** is optimized for visualizing the **frontal sinuses** and the **anterior ethmoid air cells**. - The OML (orbitomeatal line) is positioned perpendicular to the image receptor, directing the central ray 15 degrees caudal from the posterior aspect of the skull, projecting the petrous ridges below the orbits. *Towne's view* - The **AP axial projection**, or Towne's view, is primarily used to visualize the **occipital bone**, **foramen magnum**, and the **condyles of the mandible**. - It involves caudal angulation of the central ray to separate these structures. *Schuller's view* - Also known as the **lateral projection of the mastoid**, Schuller's view is primarily used to assess the **mastoid air cells** and the **external auditory canal**. - It helps in evaluating mastoiditis or cholesteatoma. *Water's view* - This **parietoacanthial projection**, or Water's view, is best for visualizing the **maxillary sinuses**, and also provides good visualization of the **orbits** and **zygomatic arches**. - The MML (mentomeatal line) is positioned perpendicular to the image receptor, projecting the petrous ridges below the maxillary sinuses.

Question 1

All are seen in acromegaly except for which of the following?

Accepted Answer

Anterior scalloping of vertebrae

Answer

Posterior scalloping of vertebrae

Answer

Calcification of pinna

Answer

Chondrocalcinosis

Question 2

Which of the following can be detected radiographically?

Accepted Answer

Interproximal caries

Answer

Root caries

Answer

Deep caries

Answer

None of the options

Question 3

The 'steeple sign' on X-ray neck (as shown in the image) is characteristically seen in which of the following diseases?

Accepted Answer

Croup

Answer

Epiglottitis

Answer

Laryngomalacia

Answer

Bronchiolitis

Question 4

The right border of the heart in a chest X-ray is formed by which of the following?

Accepted Answer

Right atrium

Answer

Right ventricle

Answer

Pulmonary artery

Answer

Superior vena cava

Question 5

The 'water lily sign' is characteristic of which condition?

Accepted Answer

Hydatid cyst of lung

Answer

Aspergilloma lung

Answer

Tuberculosis

Answer

Silicosis

Question 6

The "raindrop skull" appearance is associated with which of the following conditions?

Accepted Answer

Multiple Myeloma

Answer

Hemophilia

Answer

Thalassemia

Answer

Hodgkin's lymphoma

Question 7

Which among the following has the least HU units?

Accepted Answer

Air

Answer

Acute hemorrhage

Answer

Iodinated contrast agents

Answer

Subcutaneous fat

Question 8

Apex of the lung is best assessed by

Accepted Answer

Lordotic view

Answer

AP view

Answer

PA view

Answer

Oblique view

Question 9

String of beads sign is seen in:

Accepted Answer

Genital TB

Answer

Gastroduodenal TB

Answer

Spinal tuberculosis

Answer

Ileocaecal TB

Question 10

Which radiographic view is best for visualizing the frontal sinus?

Accepted Answer

Caldwell's view

Answer

Towne's view

Answer

Schuller's view

Answer

Water's view

Radiological Anatomy — MCQs

Radiological Anatomy — MCQs

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