BMJ Case Reports 2013; doi:10.1136/bcr-2012-008243
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Waterlily sign

  1. Ana Ortí Martín2
  1. 1Unit of Pediatrics, Hospital Universitari i Politècnic La Fe, València, Spain
  2. 2Division of Pediatric Infectious Diseases, Hospital Universitari i Politècnic La Fe, València, Spain
  1. Correspondence to Dr José Vicente Arcos Machancoses, jvicentearcos{at}


A 6-year-old boy, moved 2 years ago from rural northern Africa, was attended to in the emergency department showing productive cough and shortness of breath on effort, with decreased air inlet in right lung and under scapular isolated crackles. He presented with a 2-week history of physical decline and appetite loss. After no response to bronchodilators, a chest x-ray was performed, which revealed a giant cystic structure, occupying the middle lobe with typical features of hydatid cyst (figure 1). Contrast-enhanced CT (figure 2) revealed the waterlily sign that appears when …

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