Author(s): Prasad Mylarappa
A retained surgical foreign body is a ubiquitous medical error which occurs when nonabsorbable materials are used. The migration of a retained surgical sponge into the bladder after a gynecological procedure is rare. The calcification of migrated sponge inside the bladder without a fistula is even more unusual. This is a rare case in which the surgical sponge accidentally retained after abdominal hysterectomy, eroded into the bladder with calcification around it forming a big vesical calculus.