Radial nerve comes from the posterior part of the brachial plexus, takes additional branches from C5 and C8 and extends laterally through radius spiral groove. It extends as posterior interosseous nerve in the forearm. Radial nerve is commonly entrapped in the elbow. Radial tunnel, which extends to distal elbow from right above it and made of muscle and fibrous bands, involves radial nerve and two branches of it (superficial radial and posterior interosseous). Radial tunnel syndrome develops due to entrapment of radial nerve between supinator muscle and radial head. Paresis occurs due to affection of posterior interosseous nerve, which innervates extensor digitorum communis, extensor carpi ulnaris, extensor pollicis longus and abductor pollicis longus. Characteristic finding is pain in the lateral epycondyle extensor exit site during forces extension of middle finger which puts pressure on extensor carpi radialis brevis.