[CT findings and CT-guided puncture of a perineal cyst]

CT findings and treatment results after CT-monitored surgery of a large perineal cyst are described. This was identified as a Müllerian duct cyst which is considered--according to world literature--to be a great rarity. The high rate of relapses even on instillation of sclerosing solutions, as well as differential diagnosis in relation to other perineal cystic space-occupying growths, are discussed.