Echinococcosis is a rare infectious disease of human being that occurs by the larval stages of taeniidcestodes of the genus Echinococcus. Cystic Echinococcosis may often be diagnosed accidentally because the individual may remain asymptomatic for a long time due to the silent nature of the pathogen. Human are the accidental host and usually affected by handling an infected dog. The liver is the most frequently involved organ (65%) followed by lungs (25%). Characteristically the cysts are seen as solitary or multiple circumscribed or Oval masses on imaging. Sometimes symptoms of hydatid diseases like chest pain, breathlessness, expectoration, fever and hemoptysis can result from the release of antigenic material and secondary immunological reactions that develop from cyst rupture [1]. We report a case of incidental finding of Pulmonary Hydatid Cyst presenting as Neck of Femur fracture. A middle aged female with chief complaints of pain in the hip joint & unable to walk for 2 months was found to have decreased breath sound in left infraclavicular& mammary area. Chest x-ray showed well-defined homogenous opacity in left middle zone & some part of upper zone. The CECT thorax showed a large well defined cystic lesion with regular margin & parenchymal consolidation around the cystic lesion with mild pleural effusion. The liver parenchyma was normal. The patient was having leucocytosis with neutrophilia