LAUSR

OBJECTIVE  This study aimed to describe a rare case of a serous borderline ovarian tumor (BOT) diagnosed during pregnancy in a 15-year old adolescent. RESULTS  The suspect of BOT was raised at a transvaginal ultrasound scan in early first trimester (at 5 weeks of amenorrhea), due to the presence of a moderately vascularized irregular papilla in the context of a unilocular low-level right ovarian cyst. The patient and her parents required termination of pregnancy, irrespective of the diagnosis of an ovarian lesion. After termination of pregnancy, the patient underwent laparoscopic enucleation of the ovarian mass, omentectomy, and peritoneal biopsies. No intra-abdominal spillage of the ovarian mass occurred, and the surgical specimens were put in an endobag and extracted transvaginally. Final pathological examination confirmed the diagnosis of a serous borderline ovarian tumor. The patient of free of disease after 8 months of follow-up. CONCLUSION  Although rare, borderline ovarian tumors can be diagnosed in an adolescent during pregnancy. The combination of specific sonographic assessment and minimally invasive conservative surgery appears as a very effective approach in this type of patient. KEY POINTS · BOTs can occur in pregnant adolescents.. · Transvaginal ultrasound is crucial to suspect BOT.. · Laparoscopic conservative treatment is feasible..