Cryptogenic organizing pneumonia is an abnormal host defense reaction secondary to lung injury. A 35-year-old woman was admitted with cachexia, and tumor-like mass on chest radiograph. She underwent thoracotomy for hydatid disease. However, pathologic examination revealed histologic changes compatible with cryptogenic organizing pneumonia. Cryptogenic organizing pneumonia may present as an inflammatory cystic lesion. Introduction Cryptogenic organizing pneumonia (COP) is a rare disease, which is histopathologically defined by the presence of granulation tissue in the alveolar ducts and alveoli leading to plugging of the bronchiolar and alveolar lumen. COP is considered as a nonspecific response to many types of lung injury, including drugs, radiation, an underlying hematologic malignant neoplasm, autoimmune diseases, bacterial or virus infection, or an underlying lung disease, or occurs idiopathically, e.g. cryptogenic organizing pneumonia [1]. Clinical and radiologic manifestations of COP are nonspecific [2]. Depending on the clinicoradiologic presentation, a number of other diseases may have to be considered in the differential diagnosis of COP. To our knowledge, this is the first case in the literature, which is COP mimic hydatid disease. Case Report A 35-year-old woman was hospitalized with a 3-year history of non-productive cough, non-pleuritic chest pain, anorexia, and weight loss. The patient had smoked ? pack of cigarettes per day for 15 years. There was no history to suggest an underlying connective tissue disorders, nor relevant occupational history nor toxic fume inhalation. The physical examination except cachexia was otherwise normal. A chest CT showed a cystic lesion with consolidation in the right lung (Fig.1).
展开▼
