Hourglass-like constriction of the musculocutaneous nerve: case report.

Hourglass-like constriction has been previously associated with the main trunk of the radial nerve, with its branch of the posterior interosseous nerve, as well as the anterior interosseous nerve, a branch of the median and axillary nerve. Here, we report a case of hourglass-like constriction of the musculocutaneous nerve lesion that showed no recognizable compressive structure.