title: Voluminous "cobra-head" stone in a duplex system ureterocele: combined cysto-ureteroscopic and percutaneous cystolithotomy approach.
abstract: We report a case of a 7-year-old boy with a voluminous 8.5-cm "cobra-head" calculus in a duplex system ureterocele causing flank pain, hematuria, and infection. Combined cysto-ureteroscopy and percutaneous cystolithotomy enables dependent ureterocele incision along its inferolateral border and efficient stone clearance in a single minimally invasive procedure. Protracted and repeated urethral instrumentation is avoided.
authors.affiliation: Department of Paediatric Urology, Great Ormond Street Hospital NHS Foundation Trust, London, UK.
authors.forename: Maria Grazia
authors.initials: MG
authors.lastname: Scuderi
authors.forename: Francisca
authors.initials: F
authors.lastname: Yankovic
authors.forename: Neil
authors.initials: N
authors.lastname: Featherstone
authors.forename: Naima
authors.initials: N
authors.lastname: Smeulders
mesh_terms: D002648:Child; D003131:Combined Modality Therapy; D003558:Cystoscopy; D006801:Humans; D007668:Kidney / Q000002:abnormalities; D008096:Lithotripsy; D008297:Male; D014514:Ureteral Calculi / Q000150:complications / Q000601:surgery*; D014518:Ureterocele / Q000150:complications / Q000601:surgery*; D018666:Ureteroscopy