Temporal Evolution of a Chronic Expanding Organizing Hematoma on MRI, Including Functional MR Imaging Techniques: a Case Report

Chronic expanding organizing hematoma (CEH), also known as chronic expanding hematoma, is a benign condition in which a hematoma does not undergo resorption, but rather it persists or even expands slowly. The term was first coined by Reid et al. (1), and the authors defined CEHs as hematomas that increase in size for over 1 month after the causative event. The clinical importance of this lesion arises from the fact that it often mimics malignant soft tissue neoplasms, both clinically and radiologically (2-4). Numerous studies have described the features of CEH on conventional MRI (2-4), but reports that present the findings on diffusion-weighted imaging (DWI) (3) and dynamic contrast-enhanced (DCE) imaging are rare. Herein, we illustrate an unusual case of CEH in which we could obtain regular, serial MRI scans, including DWI and DCE, for over 2 years. This case demonstrates the added value of DWI and DCE for differentiating CEH This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Received: December 22, 2016 Revised: February 25, 2017 Accepted: March 6, 2017