Postmortem MRI of the brain with neuropathological correlation

Area of Science:

• Neuropathology
• Radiology
• Neuroimaging

Background:

• Postmortem neuropathological examination is the gold standard for diagnosing intracranial diseases.
• In vitro magnetic resonance imaging (MRI) offers a non-invasive method for evaluating brain tissue.
• Correlation between in vitro MRI and neuropathology is crucial for validating imaging techniques.

Purpose of the Study:

• To prospectively correlate in vitro MRI findings with neuropathological diagnoses in formalin-fixed brain specimens.
• To assess the sensitivity and specificity of in vitro MRI in detecting and characterizing intracranial lesions.
• To evaluate the utility of in vitro MRI in identifying lesion boundaries and perilesional edema.

Main Methods:

• Prospective correlation of in vitro MRI with neuropathological findings in 91 formalin-fixed whole-brain specimens.
• Detailed neuropathological analysis including lesion count, boundaries, edema, and lesion type.
• Comparison of in vitro MRI data with gross and microscopic neuropathological results.

Main Results:

• In vitro MRI demonstrated a sensitivity of 83.3% for detecting lesions compared to neuropathology.
• Perilesional edema was visualized more effectively with in vitro MRI than gross pathology.
• Microscopic extent of glial tumors was underestimated by both in vitro MRI and macroscopic examination.
• In vitro MRI achieved a specificity of 76.6% but could not differentiate between primary tumors, metastases, or non-neoplastic lesions.

Conclusions:

• In vitro MRI of postmortem brain specimens is a sensitive tool for detecting focal brain lesions.
• In vitro MRI can guide neuropathologists to abnormal regions, potentially improving diagnostic efficiency.
• Neuropathology remains essential for definitive diagnosis and differentiation of intracranial pathologies.