Sonographic diagnosis of tuberculoid leprosy

It has long been claimed that normal nerves cannot be sonographically delineated in vivo from surrounding structures using routine equipment. Using 7.5 MHz probes the authors recently identified the normal median nerve in the carpal tunnel, the ulnar nerve posterior to the medial condyle, and the lateral popliteal nerve at the fibular neck. Reports on the sonographic appearance of nerve tumors are rare. In this case, hypoechogenicity of a mass was related to caseous contents, while the linear internal echogenic structures represented the thickened sheath of the enlarged lateral popliteal nerve.