Superficial femoral venous aneurysm in a patient with Klippel-Trenaunay Syndrome: the inguinal hernia mimic.

Venous aneurysms are a rare vascular anomaly characterised by a solitary area of dilatation containing all three layers of the venous vessel wall. Described throughout the venous system, venous aneurysms can be classified as deep or superficial based on the vein involved. Whilst generally asymptomatic, superficial venous aneurysms can be associated with venous insufficiency or venous thromboembolism and are often confused for soft tissue masses or hernias. In young adults, venous aneurysms are often associated with Klippel-Trenaunay syndrome. Here we present a case of a primary superficial venous aneurysm in a patient with Klippel-Trenaunay syndrome mimicking an inguinal hernia.