References:
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  2. Atilgan D, Kudat H, Tükek T, et al. Role of transesophageal echocardiography in diagnosis and management of cardiac hydatid cyst: report of three cases and review of the literature. J Am Soc Echocardiogr . 2002;15:271-74
  3. WHO Informal Working Group. International classification of ultrasound images in cystic echinococcosis for application in clinical and field epidemiological settings. Acta Trop . 2003;85:253-61