The Cobb's collar is a congenital narrowing of the bulbar urethra with variable clinical presentation and obstruction grade. Herein we report a clinical case of a 13-year-old boy presenting terminal macroscopic haematuria and post-mictional urethral bleeding. At cystoscopy a membrane on the bulbar urethra distal to the external sphincter and prominent vessels in the prostatic urethra were found. Transurethral endoscopic incision was carried out with no complications or recurrence at 9-month follow-up. The authors briefly review the embryopathogenesis, clinical features and treatment of this uncommon anomaly.