Fig. 4From: Revisiting imaging features of rectosigmoid vascular malformation with emphasis on multiparametric MRI: a case reportThe macroscopic (a) and microscopic (b, c) specimen images. Macroscopically, the appearance of the bowel mucosa resembles extensive varices. The bluish submucosal tortuous dilation of blood vessels occupies the rectum and distal sigmoid colon. The microscopic examination shows numerous disorganized, dilated, and irregularly thickened abnormal blood vessels. There is a combination of new and organized-calcified thrombi. The vessels have a conspicuous muscular layer formed by the arterial type and venous type elastic fibersBack to article page