Use of transrectal longitudinal sonography in the placement of a prostatic coil.

Patients with acute or chronic urinary retention, not suitable for operation, no longer need permanent transurethral or suprapubic catheters. The prostatic coil is an excellent alternative. A series of 25 patients is presented. The technique of placement is described in detail as well as the use of longitudinal transrectal sonography in the preparation and follow-up of patients with a coil.