Atypical cystic echinococcosis in a young child

An almost four year old Argentinian girl had abdominal pain and daily fevers of 38.5°C for 5 days. She appeared to be in good general condition except for petechial lesions on the anterior trunk. She also had a painful and tense abdomen on light palpation. Abdominal ultrasonography revealed a large intraperitoneal cystic lesion measuring 11.56 cm × 10.5 cm x 4.18 cm with thin walls and liquid in the cavity (See Figure, Supplemental Digital Content 1). Laboratory tests showed slight eosinophilia. Preoperative diagnosis was a congenital cystic mass of the mesenterium. Laparotomy showed liquid in the cavity and a flaccid cyst of very thin walls surrounded by the small intestine, the stomach and the omentum. During removal it was damaged and it resembled a hydatid membrane. The abdominal cavity was washed with physiologic solution and hypertonic saline solution-soaked pads were used. The patient had an uneventful recovery and received albendazoletreatment (15 mg/kg/day). She was discharged after the 3rd postoperative day when abdominal ultrasonography and chest radiography were normal. Outpatient follow-up included abdominal ultrasonography bimonthly and albendazole treatment. Histopathological examination confirmed hydatid cyst showing laminated and germinal layers with abundant eosinophils, multinucleated giantcells and scoleces (See Figure, Supplemental Digital Content 2, which shows a histophatological section of hydatic cyst. Laminal layer, germinal layer and vesicle with two scoleces are seen. HE stain).Intraperitoneal hydatid cysts usually develop secondary to spontaneous or iatrogenic rupture of hepatic, splenic, or mesenteric cysts. Rarely an isolated primary cyst can develop in the peritoneum without evidence of cysts in other intra-abdominal organs 1. The growth rate of a hydatid cyst has been variably reported at 1-16 cm per year in abdomen 2. Abdominal cystic echinococcosis had been infrequently reported and only in adults 3. If the girl ingested the oncosphere in the first semester of life, an estimated minimum growth rate of the cyst was 2.5-3 cm per year.Canine coproparasitological research in the environment where the family was living showed a dog with Taenia sp. These findings confirm the persistence of the habit of feeding dogs with raw offal and the existence of hosts involved in the parasite life cycle, which represent risk factors to develop cystic echinococcosis or other parasitic diseases.Fil: Lavallén, Carla Mariela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biologia. Laboratorio de Zoonosis Parasitarias; ArgentinaFil: Pons, Mauricio. Hospital Interzonal Especializado Materno Infantil “Victorio Tetamanti”; ArgentinaFil: Mercuri, Enrique. Hospital Interzonal Especializado Materno Infantil “Victorio Tetamanti”; ArgentinaFil: Ortolani, Viviana. Hospital Interzonal Especializado Materno Infantil “Victorio Tetamanti”; ArgentinaFil: Scioscia, Nathalia Paula. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biologia. Laboratorio de Zoonosis Parasitarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Hollmann, Patricia. Centro Municipal de Zoonosis, Secretaría de Salud, Partido de General Pueyrredon ; ArgentinaFil: Denegri, Guillermo Maria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biologia. Laboratorio de Zoonosis Parasitarias; ArgentinaFil: Dopchiz, Marcela Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biologia. Laboratorio de Zoonosis Parasitarias; Argentin