An Incidence of Duplicated Princeps Pollicis and Radialis Indicis Arteries.

The princeps pollicis artery (PPA) is typically a direct branch off the deep palmar arterial arch. Identified is a 90-year-old female cadaver in which the right hand has a duplicated PPA and radialis indicis (RI) artery. These vessels originate from the superficial palmar arterial arch as variant vessels as well as from the deep palmar arterial arch. The superficial arch appears in its classic pattern, while the duplicate PPA and RI present at the radial aspect of the superficial arch in the volar first web space with clear communication to the superficial radial artery. There are many common surgical procedures that require precise knowledge of the first web space, such as Dupuytren's contracture release, trigger thumb release, and syndactyly release at the first web space. Further, percutaneous pinning of fractures at the base of the thumb may pose an inherent risk to the underlying vessels. Understanding these variations of hand vasculature is of clinical significance in disciplines such as orthopedic surgery, plastic surgery and vascular surgery.