Computed Tomography Test CT Anatomy and Clinical Applications

Question 1

What CT finding is pathognomonic (diagnostic) for acute epidural hematoma?

Accepted Answer

Biconvex (lens-shaped) hyperdense collection adjacent to the inner table of the skull

Answer

An acute epidural hematoma appears biconvex because it is limited by dural attachments at suture lines, and it is hyperdense (bright) due to fresh clotted blood.

Question 2

On non-contrast CT of the head, acute intraparenchymal hemorrhage typically appears as:

Accepted Answer

Hyperdense (bright white) relative to adjacent brain parenchyma

Answer

Acute blood is hyperdense on NCCT due to the high protein content of clotted hemoglobin (55–75 HU), making it easily distinguishable from normal brain (~35 HU).

Question 3

In CT of the chest, the 'ground-glass opacity' (GGO) pattern is best described as:

Accepted Answer

Hazy increased attenuation that does not obscure underlying vessels

Answer

GGO is a non-specific finding of partial air space filling or interstitial thickening where the lung appears hazy but underlying vascular structures remain visible.

Question 4

What CT sign in the chest is used to identify a pulmonary embolism on CTPA?

Accepted Answer

Filling defect (hypodense clot) within a pulmonary artery on contrast-enhanced images

Answer

A PE appears as a hypodense (dark) filling defect within the opacified (bright) pulmonary artery lumen on CTPA, representing non-enhancing thrombus.

Question 5

Which CT finding best characterizes a simple hepatic cyst?

Accepted Answer

Well-defined, water-density (0–10 HU), non-enhancing lesion with imperceptible walls

Answer

Simple hepatic cysts are fluid-filled with near-water attenuation, sharply defined margins, no internal complexity, and no enhancement after contrast administration.

Computed Tomography Test Practice Test

Computed Tomography Test Practice Test

Computed Tomography Test CT Anatomy and Clinical Applications