Background:

Endocervicosis of the urinary bladder is a rare benign entity that should be kept in mind in the differential diagnosis of a bladder tumor. It normally presents as a bladder mass in young women (if it is present with endometriosis and endosalpingiosis it is known as müllerianosis) or in older women with a previous history of gynecologic surgery, such as cesarean section or hysterectomy. Its clinical presentation is usually nonspecific, and it tends to be diagnosed as an incidental anatomopathologic finding after lesion exeresis.

Case Report:

A 35-year-old woman presented with nonspecific urinary symptoms and a bladder mass found to be consistent with endocervicosis. A later magnetic resonance imaging study revealed associated endometriosis. A review of the literature was conducted.

Discussion:

Although infrequent, endocervicosis of the urinary bladder should be considered in the differential diagnosis of bladder tumors in women and confirmed through anatomopathologic diagnosis. Treatment is based on complete exeresis of the lesion through transurethral resection of the bladder or partial cystectomy. After more than 10 years of follow-up, our patient has not presented with symptoms, recurrence, or malignization.