%0 Journal Article
%T Nail Unit Arteriovenous Hemangioma Presenting as Longitudinal Erythronychia.
%A Hwang JK
%A Magro CM
%A Lipner SR
%J Skin Appendage Disord
%V 9
%N 4
%D 2023 Aug
%M 37588479
暂无%R 10.1159/000530739
%X <B>UNASSIGNED: </B>Localized longitudinal erythronychia is defined as a single nail with a longitudinal red band extending the length of a nail plate. It has a broad differential of benign and malignant etiologies, and is rarely due to benign vascular proliferations.<BR><B>UNASSIGNED: </B>We present a unique case of nail unit arteriovenous hemangioma presenting as longitudinal erythronychia of the left thumbnail in a 76-year-old male. The band was 6 mm and encompassed over 40% of the surface area of the nail plate. Dermoscopy showed red bands that were regular in terms of color, but not thickness or spacing. Due to concern for an amelanotic melanoma, a longitudinal excision was performed. Histopathology was consistent with a diagnosis of nail unit arteriovenous hemangioma.<BR><B>UNASSIGNED: </B>Arteriovenous hemangiomas were rarely present in the nail unit. They can be present as a blue or red nodule/macule, or as longitudinal erythronychia. Diagnosis often requires an excisional biopsy, with histopathology notable for a proliferation of multiple thick- and thin-walled vascular structures lined by a flattened endothelium. Our case emphasizes the need to consider vascular proliferations, such as arteriovenous hemangioma, in the differential diagnosis of longitudinal erythronychia.