Axillary vein perforation by the medial cutaneous nerve of the forearm.

Variation in the venous pattern in the arm is common. In this study, a rare variant of the axillary vein and its association with the median cutaneous nerve of the forearm is described. In the axilla, the medial cutaneous nerve of the forearm penetrated the axillary vein, thereby creating two narrow venous channels at the site of passage. Such variations are important because a large number of diagnostic and therapeutic invasive procedures are carried out on veins. A possible mode of origin and the clinical importance of this variation are discussed.