Dermoscopy of arteriovenous hemangioma
A 30-year-old man presented with multiple erythematous papules coalescing into a 1.5-cm plaque on his left forearm [Figure 1a], which had been present for more than 10 years. On dermoscopic examination (DermLite Foto (3Gen, Dana Point, California), magnification 20×, no contact fluid used), most of the papules were characterized by homogeneous erythematous background, while some of the larger papules showed telangiectatic serpentine vessels (long, winding vascular structures) [Figure 1b]. A skin biopsy showed numerous thick-walled arteries and veins in the dermis. A diagnosis of arteriovenous hemangioma (malformation) was made. Previously, the most common dermoscopic feature of arteriovenous hemangioma was found to be non-arborizing telangiectasia on a reddish background.1 Therefore, dermoscopy may be a valuable tool for the preoperative diagnosis of this vascular malformation.