To the Editor.— David Zakin, MD, and colleagues described the clinical and radiological workup of perforated and embedded intrauterine devices (IUDs) in a recent issue ofThe Journal(1982;247:2144). They stated that the procedure of choice for demonstrating uterine perforation by an IUD is hysterosalpingography (HSG). I agree that in some cases HSG may be the only definitive way to demonstrate a partial perforation. However, computed tomography (CT) is also capable of identifying uterine perforation by an IUD. Two colleagues and I 1 recently reported such a case. The patient was positioned in the scanner by means of a digital scout view of the pelvis. The accuracy of this method of positioning allowed us to definitely diagnose a perforation after a single CT "slice." Not only is CT a speedier examination than HSG, but it is also less invasive, more comfortable to the patient, and delivers a lower gonadal radiation