Disease involving the radial nerve. Clinical features include weakness of elbow extension, elbow flexion, supination of the forearm, wrist and finger extension, and thumb abduction. Sensation may be impaired over regions of the dorsal forearm. Common sites of compression or traumatic injury include the axilla and radial groove of the humerus. The disease is radial neuropathy (MONDO_0001459). Also known as: peripheral neuropathy of radial nerve, radial nerve peripheral neuropathy.