24-year-old woman was admitted to our clinics with pain on right inguinal region for six weeks. She has been married for three years. Her medical and family histories were unremarkable. Her mens- truel cycle was normal and she was on the 22nd day in her menstruel cycle. She had one child that was born with vaginal birth. She had only mild va- ginal discharge which was thought as normal on gynecologic examination. Her vital signs and physical examination were normal. She did not get any relief from her pain despite conservative treatment. Turkiye Klinikleri J Gynecol Obst 2010;20(1) 53 Primary Pelvic Hydatid Cyst: Case Report ABSTRACT Hydatid disease (HD), also known as echinococcus or hydatidosis, is a serious health problem in areas in which it is endemic. HD has a characteristic geographic distribution. Our coun- try is an endemic region for this disease. Echinococcus granulosus is the causative agent for the dis- ease and it’s generally found in the liver and the lungs. The liver is the most common location for the disease. No spesific symptoms and signs of HD are present. Generally patients present with un- related complaints that are related to enlarging cysts. Cysts and microcalcifications within these cysts and varying fluid densities may be found with some imaging modalities such as ultrasound (US), computed tomography (CA) or magnetic resonance imaging (MRI). If the cyst ruptures, se- vere allergic reactions to parasitic antigens may occur. Clinical history, imaging findings and sero- logical tests should be used in combination for the diagnosis. We present an unusually located pelvic HD in a 24-year-old woman which mimics the bladder. Key Words: Echinococcosis; pelvic pain; endoscopy; ovarian cysts ÖZET Kist hidatik kist hastalığı, diğer adıyla hidatidozis veya ekinokokkozis, endemik bölgelerde ciddi bir sağlık problemidir. Ülkemiz, bu hastalığın endemik olduğu bölge içerisinde yer almaktadır. Ekinokokkus granulosus, hastalığa neden olan mikroorganizmadır. En sık bulunduğu lokalizasyonlar sırasıyla karaciğer ve akciğerlerdir. Spesifik semptomu veya bulgusu olmayan hastalar genellikle büyüyen kistlere bağlı değişik şikâyetlerle başvururlar. Kistler ve bu kistlerin içindeki mikrokalsifikasyonlar; ultrason (US), bilgisayarlı tomografi (BT) veya manyetik rezonans görüntüleme (MRI) gibi yöntemlerle tanınırlar. Kistin rüptür olma durumunda parazitik antijenlere bağlı ciddi allerjik reaksiyonlar gelişebilir. Nadir lokalizayonlar açısından hastalığın ayırıcı tanısı zor olmaktadır. Bu durumda; klinik öykü, görüntüleme yöntemleri ve serolojik testler faydalı olmaktadır. Biz, 24 yaşındaki kadın hastada mesaneyi taklit eden primer pelvik kist hidatik olgusunun sunumunu yapmaktayız. Anahtar Kelimeler: Ekinokokkus; pelvik ağrı; endoskopi; over kisti Turkiye Klinikleri J Gynecol Obst 2010;20(1):53-6 Hale GÖKSEVER, MD, a Murat CELİLOĞLU, MD a a Department of Obstetrics and Gynecology, Dokuz Eylül University, Faculty of Medicine, İzmir Geliş Tarihi/Received: 02.03.2009 Kabul Tarihi/Accepted: 21.05.2009 Yazışma Adresi/Correspondence: Hale GÖKSEVER, MD Dokuz Eylül University, Faculty of Medicine, Department of Obstetrics and Gynecology, İzmir, TÜRKİYE/TURKEY hgoksever@yahoo.com Copyright © 2010 by Türkiye Klinikleri OLGU SUNUMU