[Ganglion in the ulnar nerve sulcus as a cause of ulnar nerve irritation].

A ganglion at the cubital tunnel is a rare cause of ulnar nerve compression. Wrong or late diagnosis may be common. In one of the two described cases the diagnosis was made promptly, so that the early operation was followed by full restitution. In the other patient, at first the site of compression was supposed to be at the wrist. Only at the second operation was the ganglion in the cubital tunnel detected and removed. The result was unsatisfactory because motor loss was permanent.