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Zorluk: KolayInterpreting Imaging Results

An 81-year-old man is evaluated in the emergency department for progressive cognitive decline and frequent falls over the past month. His daughter notes that he has become increasingly somnolent and is dragging his right leg when walking. The patient has a history of coronary artery disease and takes daily aspirin. He fell backwards and struck the back of his head on the floor five weeks ago, though he did not seek medical evaluation at the time. Vital signs are within normal limits. Neurological examination confirms a wide-based gait and mild right-sided hemiparesis. A non-contrast computed tomography (CT) scan of the head is obtained, which reveals a crescent-shaped, hypodense extra-axial fluid collection over the left frontoparietal region that freely crosses the cranial suture lines but is bounded by the dural reflections at the midline. Based on the imaging findings provided, which of the following is the most likely diagnosis?

  1. Chronic subdural hematomaCevap
  2. B
    Acute epidural hematoma
  3. C
    Subarachnoid hemorrhage
  4. D
    Intraparenchymal hemorrhage
  5. E
    Normal pressure hydrocephalus

Cevap

Chronic subdural hematoma
The correct answer is chronic subdural hematoma. The patient's presentation of progressive neurological deficits following head trauma weeks prior, combined with the CT finding of a crescent-shaped, hypodense extra-axial collection that crosses cranial suture lines, is the classic hallmark of a chronic subdural hematoma. Subdural hematomas result from the tearing of bridging veins and typically track along the contour of the brain beneath the dura mater. Over time (typically weeks), the breakdown of blood products causes the collection to appear hypodense relative to the adjacent brain parenchyma on a non-contrast CT.

Adım Adım Çözüm

1
Analyze the patient's clinical history.
An elderly patient on aspirin presents with progressive cognitive decline and focal neurological deficits weeks after a minor head trauma.
To establish the clinical timeline and index of suspicion for delayed traumatic intracranial bleeding.
2
Evaluate the key imaging findings.
The head CT demonstrates a crescent-shaped, hypodense extra-axial collection that crosses cranial suture lines.
To identify the defining radiological characteristics of the lesion, which dictate the diagnosis.
3
Synthesize the findings to formulate the diagnosis.
The shape (crescentic) and boundary behavior (crosses sutures) point definitively to a subdural hematoma, while the density (hypodense) and timeline indicate a chronic process.
To rule out other types of hemorrhages (such as epidural, which are lens-shaped and bounded by sutures).

Anahtar Kavram

Interpretation of CT head imaging to differentiate intracranial hemorrhages, specifically recognizing that subdural hematomas are crescent-shaped and cross suture lines.
Tahmini Süre:45s
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Interpreting Imaging Results

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