Fifteen adult patients with enuresis and/or severe urge incontinence have been treated by a modified form of enterocystoplasty, using sigmoid colon or ileum. Satisfactory results have been obtained in 13 patients, who are dry both by day and by night. Three patients have slight residual urgency. Two patients (one male, one female) had voiding difficulties following cystoplasty and are now managed by intermittent self-catheterisation. The incidence of complications has been acceptable. It is concluded that this method of enterocystoplasty is a reliable form of treatment in patients with severe urge incontinence and enuresis who have failed to respond to other treatment.