Waterlily sign
Khanna, M.; Chauhan, S.; Dalal, U.; Lehl, S.S.
Medical Journal of Australia 186(12): 654
2007
ISSN/ISBN: 0025-729X PMID: 17576186 Document Number: 607994
A case of echinococcosis in a 32-year-old farmer from rural north-west India is presented. The patient had a history of paroxysms of cough with expectoration. He owned livestock (hens, goats, cattle and dogs) and lived alongside them. Physical examination was unremarkable except for reduced air entry in the left infra-axillary and infrascapular area. A chest X-ray showed a large, thin-walled cavity containing membranes in the lower lobe of the left lung, together with a left pleural effusion. A contrast-enhanced computed tomography scan of the chest revealed a cyst in the left lower lobe of the lung containing a freely floating endocyst (the "waterlily sign"). The diagnosis of Echinococcus infection (hydatid cyst) was confirmed by positive serology.