Identify the condition shown in CT

INI-CET EXAM -2025

Image Based Questions (E5)

Easy

Appeared in: INI-CET EXAM -2025

Explanation

An Epidural Hematoma (EDH) is a collection of blood in the potential space between the dura mater and the skull.
On a non-contrast CT scan, an acute EDH classically appears as a biconvex or 'lens-shaped' hyperdense (bright) collection.
This shape is because the expanding hematoma strips the dura away from the inner table of the skull, but the collection is limited by the firm dural attachments at the cranial suture lines.
EDH is most often caused by a traumatic skull fracture (especially of the temporal bone) that lacerates an underlying artery, typically the middle meningeal artery.
The arterial nature of the bleed leads to rapid expansion and is considered a neurosurgical emergency.

Option B: A Subdural Hematoma (SDH) appears as a crescent-shaped collection of blood on a CT scan, not lens-shaped. It follows the contour of the brain.
Option C: A Subarachnoid Hemorrhage (SAH) is characterized by blood within the sulci, fissures, and basal cisterns of the brain, not a localized collection outside the brain parenchyma.
Option D: An Intracerebral Hemorrhage (ICH) is bleeding that occurs directly within the brain tissue (parenchyma), not in the epidural space.

Visual 1: Diagram - A comparative illustration showing the CT appearances of EDH (lens-shaped), SDH (crescent-shaped), SAH (blood in sulci), and ICH (within brain tissue).
Visual 2: Anatomical Drawing - A cross-section of the head showing the layers (skull, dura, arachnoid, pia) and the location of an epidural hematoma between the skull and dura.
Visual 3: Flowchart - A diagnostic flowchart for a patient with head trauma, showing how clinical signs (e.g., lucid interval) and CT findings lead to a diagnosis of EDH.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Interpretation of CT scan for intracranial hemorrhage as background academic context rather than a clinical decision trigger.
EDH is a critical neurosurgical emergency. Rapid identification and surgical evacuation are vital to prevent increased intracranial pressure (ICP), brain herniation, and death.
Nurses must perform frequent and vigilant neurological assessments (e.g., Glasgow Coma Scale, pupillary checks) on all head trauma patients, as a patient with an EDH can deteriorate rapidly after a 'lucid interval'.
What if? If the patient was elderly and on anticoagulants with a minor fall a week ago, and the CT showed a crescent-shaped collection of mixed density, the most likely diagnosis would shift to a chronic Subdural Hematoma (SDH), which requires different management.

How to Approach the Question

First, acknowledge that the question asks to identify a condition from a CT scan. Note that the image is missing and proceed with a logical assumption or general knowledge.
Recall the typical CT appearances of the four main types of traumatic intracranial hemorrhage: EDH, SDH, SAH, and ICH.
Focus on the key differentiating feature: the shape of the bleed. Is it lens-shaped (biconvex) or crescent-shaped?
Consider the location of the bleed in relation to the brain and skull layers. Is it between the skull and dura (epidural), between the dura and brain (subdural), in the subarachnoid space, or within the brain tissue itself (intracerebral)?
Based on the classic 'lens shape', associate this with an Epidural Hematoma (EDH).
Eliminate the other options based on their characteristic shapes: SDH (crescent), SAH (sulcal), and ICH (intraparenchymal).

Concept Tested & Keywords

Concept Tested: Interpretation of CT scan for intracranial hemorrhage
Stem keywords: CT, Identify the condition
Lead-in keywords: Identify
Clinical cues: IMAGE MISSING: Solution is based on the assumed presence of a classic Epidural Hematoma (EDH) on the CT scan.

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