[Cerebral hemorrhage: initial experiences with magnetic resonance imaging]

Area of Science:

• Radiology
• Neurology
• Pathology

Background:

• Hematomas present diverse MR imaging features.
• Temporal evolution of hematomas influences their appearance.
• Hemoglobin breakdown products are key to hematoma characterization.

Purpose of the Study:

• To analyze MR imaging characteristics of hematomas.
• To classify hematomas based on their stage of evolution.
• To develop an interpretative tool for hematoma diagnosis.

Main Methods:

• Utilized 1.5 T superconducting magnet for MR imaging.
• Examined 29 hematomas (spontaneous, traumatic, vascular malformative, intratumoral).
• Correlated imaging findings with hemoglobin breakdown products.

Main Results:

• Hematoma appearance depends on dimension, water content, macrophage border, and paramagnetic hemoglobin products.
• Classified hematomas into acute (deoxyhemoglobin), subacute (methemoglobin stages), and chronic (hemosiderin rim).
• Developed interpretative schemes based on literature and observed cases.

Conclusions:

• MR imaging, particularly the presence of hemoglobin breakdown products, is crucial for hematoma classification.
• The proposed classification scheme aids in differentiating hematoma stages.
• Understanding temporal evolution on MRI improves diagnostic accuracy.