A 27-year-old female patient was admitted to the Reproductive Function Clinic, Institute of Gynaecology and Obstetrics in Poznań, for periodically occurring painful symptoms in the left iliac fossa. Gynaecological examination found at the site of left adnexa a solid mass with smooth surface, preliminarily diagnosed as adnexal tumour. Ultrasonography found ectopic kidney in pelvic presentation which was confirmed by urography.