Pelvic hydatid cysts, although rare, must be considered when evaluating a pelvic mass in women living in an endemic area. The pelvis may become secondarily involved as a result of a rupture of the cyst in another location or be the only localization of the disease. If the cyst becomes secondarily infected, it may mimic a tuboovarian abscess. A 49-year-old multipara was admitted to the emergency department with the complaint of fever, generalized abdominal pain and distension. Abdominal ultrasound revealed a 4 cm cystic structure in the liver and the gynecological examination was normal. The patient's abdominal pain receded spontaneously, so she was prescribed albendazole and discharged from the hospital. Ten days later, she complained of pelvic pain, pressure and vaginal discharge. The uterus and adnexa were tender on pelvic examination. Ultrasound revealed an 8 cm uniloculated cyst with free floating internal echogenities located between the bladder and the uterus. At surgery a 10 cm right-sided tuboovarian mass was present. A germinative membrane was present inside the abscess and pericystectomy with unilateral salphingo-oophorectomy was performed.;">