An unusual cause of acute abdominal pain in a young man.

To cite: Meshikhes A-WN. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/ bcr-2013-200285 DESCRIPTION A 19-year-old boy presented with a sudden onset of severe lower abdominal pain which was associated with nausea and vomiting, but no change in bowel habits, fever or weight loss. He gave a 2-year history of recurrent mild colicky lower abdominal pain, but no history of previous abdominal surgery. Clinical examination revealed low-grade fever (37.9°C) with generalised lower abdominal peritonism (tenderness with guarding, rigidity and rebound). Blood investigations showed leukocytosis (13.8×10/L), normal renal and liver panels, but negative hydatid serology. The CT scan revealed an 8.3×8 cm right hepatic cystic mass with splitmembrane sign consistent with complicated hydatid cyst (figure 1A). There were also multiple pelvic cystic masses of variable sizes (figure 1B). At laparotomy, an infected right hepatic hydatid cyst and another smaller cyst in the lesser sac were drained after taking the standard precautions against spillage. Multiple hydatid cysts were found attached to the greater omentum and in the pelvic cavity. Some were infected and one was already leaking its infected contents (figure 2A). All omental cysts were completely excised (figure 2B) and the others were drained. He was discharged on three cycles of albendazole (400 mg twice daily for 28 days, repeated thrice with 2-week drug-free interval after each cycle). He remained well 5 years later with no recurrence. Spontaneous or traumatic rupture of a hepatic hydatid cyst is not always associated with anaphylactic shock and sometimes remains silent and the patient presents many years later with disseminated peritoneal hydatidosis. Hence, hydatidosis is almost always secondary to hepatic hydatid disease. It may remain silent and asymptomatic for many years, or it may present with an acute abdominal pain whenever one of the cysts is complicated by either infection or leakage. Treatment in such patients requires careful surgical excision. 3 However, surgery is associated with a high recurrence rate that can be reduced by the use of drug therapy such as albendazole.