%0 Journal Article %A Mohammad Shameem %A Jamal Akhtar %A Rakesh Bhargava %A Zuber Ahmed %A Nafees Ahmad Khan %A Ummul Baneen %T Ruptured Pulmonary Hydatid Cyst With Anaphylactic Shock and Pneumothorax %D 2011 %R 10.4187/respcare.00821 %J Respiratory Care %P 863-865 %V 56 %N 6 %X Hydatid cyst is a disease caused by a parasitic tapeworm, Echinococcus granulosus, and most commonly involves liver and lung. Ruptured pulmonary hydatid cyst can present a diagnostic challenge, and radiograph can be inconclusive. Anaphylactic reaction is a rare complication of ruptured pulmonary hydatid cyst. A 22-year-old male came to our emergency department in shock with symptoms of shortness of breath and altered mental status from the previous day. Radiograph showed a thin-walled circular translucent area in the right upper lung field, which was misdiagnosed as pneumothorax, and an intercostal chest tube was inserted. After 5 days, repeat radiograph revealed a cavity with an air/fluid level. The chest tube was removed and contrast-enhanced computed tomogram showed a cavity with water-lily sign, which suggests ruptured hydatid cyst. Immunoglobin-G enzyme-linked immunosorbent assay for Echinococcus was positive. The patient responded well to treatment with crystalloid infusion, supplemental oxygen, and albendazole, and then underwent surgery. Anaphylactic reaction due to rupture of a hydatid cyst is rare, but hydatid disease should be suspected in patients from areas where Echinococcus is endemic. %U https://rc.rcjournal.com/content/respcare/56/6/863.full.pdf