Three women had evidence of atypical endometrial hyperplasia at the ti
me of endometrial ablation, discovered because they had mechanical pre
paration of the endometrium rather than medical preparation. In one of
these patients, a frozen section revealed atypical endometrial hyperp
lasia, and the ablation was cancelled. A fourth woman had an unsuccess
ful endometrial ablation; repeat ablation was followed by nine months
of amenorrhea, at which time she began spotting and requested a hyster
ectomy. The pathology report on the hysterectomy specimen revealed ade
nomatous hyperplasia. Gynecologists must be vigilant in their evaluati
on of the endometrium before, during and after endometrial ablation.