Isodense subdural haematomas on CT:MRI findings

Area of Science:

• Neuroradiology
• Neuroimaging
• Traumatic Brain Injury

Background:

• Subdural hematomas can be challenging to age-date using computed tomography (CT), especially when they appear isodense.
• Accurate determination of subdural hematoma age is critical for appropriate clinical management and prognosis.

Purpose of the Study:

• To describe and analyze magnetic resonance imaging (MRI) findings in two patients with isodense subdural hematomas on CT.
• To highlight the utility of MRI in differentiating the age of subdural hematomas, particularly in complex cases.

Main Methods:

• Case study of two patients presenting with subdural hematomas.
• Detailed analysis of MRI sequences (specifically T2-weighted images) and CT findings.
• Correlation of imaging findings with clinical presentation and patient history.

Main Results:

• A chronic subdural hematoma, 6 weeks post-trauma, exhibited extreme hypointensity on T2-weighted MRI, mimicking acute rebleeding.
• An acute subdural hematoma in a patient with severe anemia showed hyperintensity on T2-weighted MRI, suggesting chronicity, potentially due to low hematocrit and blood-cerebrospinal fluid mixture.
• MRI findings can sometimes appear contradictory to the clinical timeline, necessitating careful interpretation.

Conclusions:

• MRI provides valuable insights into the age of subdural hematomas, offering more detail than CT in certain scenarios.
• Specific MRI signal characteristics, such as T2-weighted hypointensity or hyperintensity, must be interpreted cautiously in the context of patient factors like anemia.
• Awareness of potential MRI ambiguities in subdural hematoma aging is essential to avoid misjudgment and ensure correct clinical decisions.