Chronic subdural hematoma: demonstration by magnetic resonance

Area of Science:

• Neuroradiology
• Medical Imaging
• Neurology

Background:

• Chronic subdural hematomas present diagnostic challenges.
• Computed tomography (CT) can be limited in visualizing isodense hematomas.
• Magnetic resonance (MR) offers potential for improved hematoma detection.

Purpose of the Study:

• To evaluate the efficacy of MR imaging in identifying intracranial hematomas.
• To assess MR imaging's ability to detect chronic subdural hematomas, particularly those isodense on CT.

Main Methods:

• Five patients with clinical and CT signs of chronic subdural hematoma were studied.
• T1-weighted inversion recovery (IR 1,500/400) and spin echo (SE) sequences were utilized.
• Specific parameters included SE 500/160 for enhanced visualization.

Main Results:

• Extracerebral collections appeared as bright intensity zones on T1-weighted IR sequences, indicating short T1 relaxation times.
• High intensity was observed on SE sequences (100 ms and 160 ms delays), reflecting long T2 relaxation times.
• The SE 500/160 sequence significantly enhanced specificity for detecting chronic blood collections, visualizing all hematomas even when isodense on CT.

Conclusions:

• MR imaging is a valuable tool for detecting intracranial hematomas.
• MR imaging, particularly with specific pulse sequences, can reliably visualize chronic subdural hematomas.
• MR imaging provides superior visualization compared to CT for isodense subdural hematomas.