Invasive pulmonary cryptococcosis mimicking metastatic lung cancer:A case report and review of literature  

作　　者：Cheng-Yan Gao Xue-Jiao Yang E Guo Yu-Lan Zheng 

机构地区：[1]School of Medicine,Wuhan University of Science and Technology,Wuhan 430081,Hubei Province,China [2]Department of Respiratory and Critical Care Medicine,Xiangyang Central Hospital,Affiliated Hospital of Hubei University of Arts and Science,Xiangyang 441000,Hubei Province,China [3]Department of Respiratory and Critical Care Medicine,Xiangyang Central Hospital,Xiangyang 441000,Hubei Province,China

出　　处：《World Journal of Clinical Cases》2025年第20期85-93,共9页世界临床病例杂志(英文)

摘　　要：BACKGROUND Worldwide,there has been a steady increase in the number of cases of pulmonary cryptococcosis diagnosed in immunocompetent patients,where symptoms can range from mild to severe.Clinical and radiological distinction of disease may be made when compared with immunodeficient cases and in those presenting with primary lung carcinoma.In the latter case confusion can lead to initial misdiagnosis and delayed treatment.We report a case of disseminated cryptococcosis in an immunocompetent patient which mimicked a primary lung carcinoma with brain metastases.CASE SUMMARY A 51-year-old male farmer with a 30-year smoking history presented with a twoweek history of productive cough,streaky hemoptysis,and low-grade fever.He had no history of immunosuppression,tuberculosis,or specific risk factors.Chest computed tomography revealed a posterior basal left lower lobe mass,but tumor markers and transbronchial tests were negative.Brain magnetic resonance imaging showed an enhancing left frontal lobe lesion,raising suspicion for metastatic lung cancer.However,computed tomography-guided biopsy confirmed fungal pneumonia with“titan”cells,and a positive serum cryptococcal antigen test confirmed Cryptococcus neoformans infection.Bronchoscopy and lavage detected fungal spores,while cerebrospinal fluid cytology and culture were negative.Fluconazole(0.4 mg/day)was initiated,but progressive central nervous system lesions required amphotericin B.A six-week combination of fluconazole(600 mg/day)and flucytosine led to resolution.At 24-month follow-up,he remained asymptomatic with no recurrence.CONCLUSION Cryptococcosis is increasing in immunocompetent individuals in China and should be considered in pneumonia and lung or brain lesions.

关 键 词：Pulmonary cryptococcus infection Cryptococcal encephalitis Cryptococcus neoformans Magnetic resonance imaging Transbronchial biopsy Case report 

分 类 号：R519[医药卫生—内科学]