Urethroplasty is a surgical procedure to repair a narrowing (stricture) of the urethra, the tube that carries urine from the bladder out of the body. Sometimes, a graft may be required for the repair and this is commonly taken from the inside of the cheek (buccal mucosa) to reconstruct the urethra.
Depending on your medical condition, this may be performed as a staged procedure, requiring more than one surgery. Source: Barbagli G et al. Dorsal Onlay Oral Mucosal Graft Bulbar Urethroplasty. BJUI (2012).