Preusser, S., et al. - Endocervicosis of the bladder is a rare, benign variant of endometriosis. The lesions are characterized by ectopic, glandular structures of Müllerian origin with intracytoplasmic mucin production. During placement of a ureteral stent, a cystic tumor in the posterior bladder wall was discovered in a 47-year-old woman with nephroureterolithiasis