Benign vertebral hemangioma: MR-histological correlation.

Area of Science:

• Radiology
• Pathology
• Orthopedic Surgery

Background:

• Vertebral hemangiomas are common benign vascular tumors.
• Their characteristic appearance on magnetic resonance imaging (MRI) can be variable.
• Understanding the underlying histology is crucial for accurate interpretation.

Purpose of the Study:

• To correlate magnetic resonance (MR) imaging findings with histological features of benign vertebral hemangiomas.
• To elucidate the relationship between signal intensity on MR images and the specific tissue components of these lesions.

Main Methods:

• Analysis of 83 autopsy spine specimens with sagittal T1- and T2-weighted spin-echo MR images.
• Macroscopic identification of vertebral hemangiomas followed by histological and quantitative analysis.
• Point-counting method to determine the proportion of adipocytes, vessels, edema, and hematopoietic cells in normal marrow and lesion areas (Pattern A and B).

Main Results:

• Nine lesions confirmed as cavernous hemangiomas histologically.
• Pattern A lesions (high T1, intermediate T2) showed significantly higher adipocyte proportion (78.1%) compared to Pattern B (42.7%) and normal marrow (47.5%).
• Pattern B lesions (intermediate T1, high T2) demonstrated a significantly higher proportion of vessels and edema (47.0%) compared to Pattern A (15.5%) and normal marrow (0).

Conclusions:

• High signal intensity on T1-weighted MR images of vertebral hemangiomas is associated with a higher content of adipocytes.
• High signal intensity on T2-weighted MR images is related to increased vascularity and interstitial edema.
• This correlation aids in the accurate diagnosis of benign vertebral hemangiomas using MRI.