Onlay urethroplasty with unilatreral parameatal penopreputial flap: Mansoura modification of Koyanagi technique in the management of hypospadias without chordee

Abstract

Background/purpose: One-stage urethroplasty with bilateral parameatal foreskin flap was first described by Tomohiko Koyanagi for cases of severe hypospadias. He also introduced the onlay urethroplasty with unilateral parameatal foreskin flap for distal hypospadias. Emir and colleagues in 2000 devised a modification of the bilateral Koyanagi repair of severe hypospadias. We in turn modified the (unilateral) Koyanagi technique for the repair of hypospadias without chordee. The aim of this study is to analyze the results of the Mansoura modification of the (unilateral) Koyanagi technique as a one-stage repair of hypospadias without chordee.

Patients and methods: During the period from March 2013 to March 2015, 30 patients underwent treatment of hypospadias without chordee using the modified onlay urethroplasty with unilatreral parameatal penopreputial flap (modified unilateral Koyanagi technique).

Results: The patients’ age at the time of surgery ranged from 6 to 30 months. Sixteen cases had distal penile meatus, 10 had mid-penile meatus; and four had proximal penile meatus. The follow-up ranged from 3 months to 1 year. Primary success occurred in 28 (93%) cases with accepted cosmetic appearance. Complications occurred in two (7%) cases, in the form of urethrocutaneous fistula. There was no incidence of meatal stenosis nor recession, urethral stricture or flap necrosis.

Conclusion: The Mansoura modification of the onlay urethroplasty with unilatreral parameatal penopreputial flap (unilateral Koyanagi) is applicable for all forms of hypospadias without chordee showing acceptable results.

Keywords: hypospadias, modified Koyanagi, one-stage urethroplasty, onlay urethroplasty with parameatal penopreputial flap, original Koyanagi