Arteriovenous Malformation Observed in the Auricula in an Elderly Patient: A Case Report

Arteriovenous malformation (AVM) refers to the abnormal venous formations, which are generally localized to intracranial region and directly related with each other without a capillary connection between artery and vein. The lesion is frequently seen in the head-neck region but rarely in auricula. A 64-year-old male patient, who applied to the family health center with the complaints of tinnitus and hemorrhagic mass in the auricula, was referred to the otolaryngology department. The mass was excised there and then closed using primary suture. A hemorrhagic material with 1.7x0.7x0.7cm dimensions and, having a thin stem and off-white colored surface, and polypoid appearance was brought to our pathology department. In the histopathological examination, a well-circumscribed lesion consisting of arteries and vessels having different sizes and radii and thick walls was observed. In immunohistochemical staining, the case was found to be CD31 and CD34 (+) and Podoplanin (-). In histochemical staining, the staining with MTK (Masson's Trichrome Stain) was observed in vessel walls. In the all these findings, the diagnosis of AVM limited to auricula was made. Since this case is rarely seen, it is presented together with a literature discussion.