Right neck venous thrombosis following ovarian hyperstimulation syndrome in a patient with protein S deficiency: A case report and review of literature.

OBJECTIVE: The risk of venous thromboembolism in pregnancies increased in ovarian hyperstimulation syndrome (OHSS) after assisted reproductive technologies (ART). We present a rare case with protein S deficiency receiving ART treatment with OHSS, following right neck venous thromboembolism. CASE REPORT: A 34-year-old women with primary infertility underwent IVF treatment and presented with OHSS. However, thromboembolism in the right jugular and subclavian veins was diagnosed at eight weeks of gestation. She was continuously treated with low molecular weight heparin (LMWH) since eight weeks of gestation and the diagnosis of protein S deficiency was made. Due to placenta previa with massive bleeding, she gave live birth to two healthy babies via cesarean section at 34 weeks of gestation. CONCLUSION: Thromboembolism is one of life-threatening complications among women with OHSS. Although inherited thrombophilia is rare diseases, thrombophilia workup may be taken into consideration for women with thrombotic events.