Digital arteriovenous malformation

Pregnancy-associated acquired arteriovenous malformation of the nail unit: a novel cause of localized erythronychia

Localized longitudinal erythronychia describes a solitary red streak limited to a single nail unit. Localized longitudinal erythronychia can be caused by both benign and malignant entities. Most commonly, the cause is a benign process, such as an onychopapilloma. We report a case of an acquired subungual arteriovenous malformation that presented as localized longitudinal erythronychia during pregnancy. To our knowledge, this is the first report of localized longitudinal erythronychia arising from a pregnancy-associated arteriovenous malformation of the nail unit.

Acquired digital arteriovenous malformation: a report of three cases and study with epiluminescence microscopy

Acquired digital arteriovenous malformation is an abnormal connection between the arteriole and venule in the finger, fed by the digital vessels. Lesions are characterized by small, slightly raised dark-red macules on the distal part of the fingers. In the past, similar cases had been described using the terms 'cutaneous keratotic haemangioma' and 'periungual and subungual arteriovenous tumours'. In this article, we would like to discuss three additional cases that were studied using epiluminescence microscopy. Pathological findings and the possible pathogenesis are also presented.