Case Reports in Otolaryngology / 2014 / Article / Fig 4

Case Report

A Rare Presentation of Retiform Hemangioendothelioma in the External Auditory Canal

Figure 4

(a) Histopathological image of the tumor shows that the vascularity of the tumor and the blood vessels are arranged in retiform pattern (H&E staining, magnification ×10). The same section under high magnification shows classical hobnail type of endothelial cells projecting into the lumen of the vascular channels (magnification ×40, window). (b) Immunohistochemical staining of sectioned tumor indicates that the tumor cells are positive for CD34 (magnification ×10, ×40 (top right window)) and occasionally positive stain for Ki-67 (c).