Working classification and the quest for an effective, reconstructive management strategy in Y duplication of male urethra.

INTRODUCTION

Y-duplication is a rare subtype of urethral duplication whose surgical correction has traditionally yielded less than satisfactory results. Herein we report 18 patients, 17 of whom have completed successful urethral reconstruction.

MATERIALS AND

METHODS

A retrospective analysis was done on 18 children who have undergone repair of Y-duplication urethra in two tertiary care institutes from 2013 to 2020. The various subtypes encountered were classified in order to develop a rationale for reconstruction based on the underlying pathology. The various modalities used for reconstruction and the outcomes of the repair were studied. All but one boy voided mainly via the posterior (ventral) channel opening in the ano-rectum or perineum. These boys had the urethral reconstruction incorporating the healthy proximal ventral urethra at its origin. Further reconstruction up to the glans tip depended on the degree of dorsal (orthotropic) urethral patency, which forms the basis of our classification into Types I (completely stenotic), II (penile urethra patent), III (penile and bulbar urethra patent) and IV (fully patent dorsal urethra).

RESULTS

Reconstruction resulting in voiding via a glanular or coronal meatus was completed in 17 boys. One boy is awaiting further surgery while being dependent on Mitrofanoff CIC. While urethral continuity could be achieved using patent segments of native urethra alone into two boys (Types II and III), all other children needed a neo-urethral segment to replace (Type I) or supplement (Type II) the dorsal urethra. Neo urethra was constructed from a tubularized preputial island flap (n = 11), Monti tube constructed from ileum (n = 3) or sigmoid colon (n = 4). A perineal operative exposure alone sufficed in 9, while the rest required an additional trans pubic approach. The only boy with Type IV anomaly underwent excision of the ventral urethral limb. Three boys with initially elevated serum creatinine have normal levels after reconstruction.

CONCLUSION

Successful reconstruction of boys with Y- duplication of the urethra entailed elucidation of anatomical variations, adequate operative exposure (trans pubic and/or perineal) and innovative utilisation of local and/or distant tissues (preputial island flap, ileal/sigmoid Monti tubes).