BACKGROUND:

Teratomas are the most common type of germ cell tumor. Mature cystic teratoma represents more than 95% of all ovarian teratomas and is almost invariably benign. The finding of a simple or complex adnexal cystic lesion in pregnancy is not an uncommon event (5%), with a presentation of mature teratoma during gestation in 30-50%. Although the mass torsion is not common, when it occurs its indicated treatment, surgery.

CLINICAL CASE:

A 29-year-old woman who attended the General Hospital Miguel Silva in Morelia, Michoacán, for pregnancy of 15.2 weeks of gestation plus acute pelvic pain. Pelvic ultrasound was performed with insufficient report, for which reason magnetic resonance was requested, in which well-defined and limited right adnexal tumor is reported with regular borders of approximately 10 x 9 x 9 cm. She underwent exploratory laparotomy with surgical protocol, a right ovarian tumor of 14 x 10 cm with vascular involvement was found. Right salpingo-oophorectomy was performed. The surgical specimen measured 16 x 11 x 7 cm, the histopathological study, reported mature cystic teratoma with vascular compromise. Favorable post-surgical evolution of the patient

CONCLUSION:

Acute pelvic pain during pregnancy secondary to an adnexal torsion is infrequent. It must have an accurate diagnostic approach for a proper treatment.