Abstract
Fibrosis of the corpus spongiosum caused by urethral or transurethral manipulations and the resulting ventral deviations of the erect penis were described as urethral manipulation syndrome (UMS) in 1984. Because the transurethral route is used for some endourologic manipulations of the upper urinary tract, complications that can arise from these procedures are the concern of the urologist. All transurethral manipulations cause some degree of urethral inflammation, which is usually transient. When this inflammation does not subside, it may cause fibrosis of the corpus spongiosum, leading to ventral bending of the penis during erections. Surgery is indicated when the curvature causes sexual dysfunction or is accompanied by severe urethral strictures. Four demonstrative cases are presented.

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