[Pulmonary cryptococcosis coexisting with lung cancer confirmed by pathological examinations: report of 3 cases and literature review].

Objective: To describe the clinical characteristics of pulmonary cryptococcosis(PC)coexisting with lung cancer. Methods: We reported 3 cases of PC coexisting with lung cancer confirmed by pathology in Qingdao Municipal Hospital from January 2017 to December 2021.We reviewed the literature with"pulmonary cryptococcosis" and "lung cancer" as the keywords to search Wanfang database, China HowNet and PubMed database. Results: The patients consisted of 2 males and 1 female. Two patients were diagnosed with nodular type of PC and one with diffuse mixed type of PC. One patient had underlying cardiovascular diseases and the other two had no medical history. The clinical manifestations varied including fever, cough, sputum, and no specific symptoms. All the patients received surgery and postoperative medical therapy, and all 3 patients were pathologically confirmed with adenocarcinoma. A total of 18 cases were retrieved from related literatures. To our knowledge, one of our cases was the first one with diffuse mixed type of PC coexisting with lung cancer. Conclusions: Coexistence of pulmonary cryptococcosis and lung cancer is rare and the clinical symptoms are nonspecific. When PC coexists with lung cancer, it is extremely easy to be misdiagnosed. Therefore, PC should be considered in the differential diagnosis of pulmonary nodules and multiple imaging changes.