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CT Case 2 - Hypoplastic Radial Artery
A CTA of the right forearm was performed on an 11 year old female with a congenital deformity of the right thumb and radius, and an impalpable right radial pulse.
The radial artery is hypoplastic and terminates in the mid forearm. The ulnar artery is dominant in the forearm and directly supplies the digital arteries through a series of bifurcations as there are no palmar arches. See Images A and B below.
Image A 3D image of the variant vascularanatomy in the forearm. The radial artery is hypoplastic and terminates in the mid forearm and there are no palmar arches.
Image B MIP demonstrating the variant vascular anatomy in the forearm.
Image C above illustrates the conventional anatomy of the ulnar and radial arteries in the forearm.
Image C Conventional anatomy of the ulnar and radial arteries in the forearm.
The radial artery is the smaller of the two terminal branches of the brachial artery and begins distal to the cubital fossa. It descends on the radial side of the forearm and ends at the wrist where together with the deep palmar branch of the ulnar artery it forms the deep palmar arterial arch. The radial artery gives of a superficial palmar branch at the distal end of the radius which anastamoses with the terminal part of the ulnar artery to form the distally located superficial palmar arterial arch.
The ulnar artery is the larger of the two terminal branches of the brachial artery and descends on the ulnar side of the forearm to the wrist. The superficial branch of the ulnar artery continues distally into the palm as the superficial palmar arterial arch. The deep palmar branch of the ulnar artery anastamoses with the radial artery to form the proximally located deep palmar arterial arch.
Image C: www.www.nakedscience.org/mrg/Anatomy%20Lecture%
Moore, K (1992) “Clinically Oriented Anatomy”, 3rd edn, Williams & Wilkins, Baltimore.
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