Primary pelvic hydatid cyst obstructing the labour

Hydatid disease,caused by echinococcus granulosus,is a common parasitic infection of the liver. primary pelvic hydatid cyst is an extremely rare condition and occurs in approximately 0.7% of patients. hydatid disease in pregnancy is a very rare condition with incidence of 1/20000 pregnancies. we report here an unusual case of hydatid cyst of the pelvis in a 30 years old multigravida presenting with obstructed labour. ultrasonography showed well defined mixechoic cystic mass in left adnexa. patient underwent caesarian section with delivery of a healthy baby followed by obstetric hysterectomy and laparotomy for pelvic hydatid cyst. histopathology confirmed hydatid cyst. patient was put on chemotherapy and is doing well on follow up. a pelvic hydatid cyst should be taken into consideration in cases of cystic masses,especially in endemic regions. the case represents an uncommon site and uncommon presentation of a common disease. © journal of krishna institute of medical sciences university.