Sonographic diagnosis and treatment of ganglion cysts causing suprascapular nerve entrapment.

One cause of shoulder pain is suprascapular nerve entrapment resulting from compression by a ganglion cyst. We discuss the sonographic diagnosis and treatment of these ganglion cysts and the use of sonographically guided aspiration of these cysts. Previous authors have described CT or MR imaging diagnosis and CT guided aspiration of ganglion cysts. Sonographically guided aspiration appears to be an equally effective but less expensive method to treat these cysts.