[Ultrasonography in carpal tunnel syndrome. A case report].

Ultrasonography is an excellent tool for diagnosing pathologies of peripheral nerves. It quickly provides reliable information about possible nerve entrapment, even in post-operative conditions. We present a case of failed surgery for carpal tunnel syndrome in which ultrasonography gave us immediately all the information needed for quick therapeutic decision-making. Some basic principles of ultrasonography of peripheral nerves are also mentioned.