Cryptogenic organizing pneumonia masquerading as lung carcinoma: A case report and review of the literature

Cryptogenic organizing pneumonia (COP) is a rare pulmonary disorder of unknown etiology. COP with hemoptysis as the primary presenting symptom has rarely been reported. The present study reported a case of COP that resembled lung carcinoma with hemoptysis as the only clinical symptom. The patient recovered well following thoracoscope surgery. A literature review of 119 COP cases between 1995 and 2015 was presented. Cough, fever and dyspnea were the most common clinical manifestations. The most common imaging manifestations were multiple or single consolidation, lung nodules, migratory sign, reversed halo sign, and multiple ground-glass opacity. A total of 3 cases exhibited COP accompanied by lung cancer. Glucocorticoids were effective for the majority of cases and invasive surgeries were implemented in most cases. The majority of cases recovered or relieved, and the prognosis of COP was relatively good. COP was easily confused with lung tumor and it is necessary to make differential diagnosis between COP and lung cancer. Invasive surgery should be avoided when possible to avoid or reduce patient trauma.