[Benign cystic teratoma (dermoid cyst) of the ovary perforated into the urinary bladder]

In a 25-year-old female patient with right-sided adnex tumour and inveterate infection on the urinary tract a benign cystic teratoma (dermoid cyst) perforated into the lumen of the urinary bladder could diagnosed cystoscopically. As therapeutic method of choice the tumour with the adjacent part of the wall of the urinary bladder was operatively removed. The histological investigation confirmed the right ovary as starting point of the tumour. Pathogenetic and etiologic points of view of the perforation of dermoid cysts of the small pelvis into adjacent hollow organs are discussed in short. When a perforation into the lumen of the urinary bladder is present, among others the clinical symptoms of the flux of hair and fatty paste with the urine belonging to this give good diagnostic references.