Figure 18a. Epithelioid hemangioendothelioma of the hand. (a, b) Axial T2-weighted (a) and sagittal T1-weighted (b) MR images show a nodular lesion of the hypothenar region (arrow). The lesion demonstrates moderately high signal intensity on the T2-weighted image and intermediate signal intensity on the T1-weighted image. (c) High-power photomicrograph (original magnification, x400; H-E stain) shows strands of fusiform endothelial cells (arrows) and canalized vascular channels (*).