The performance of serum cryptococcal capsular polysaccharide antigen test, histopathology and culture of the lung tissue for diagnosis of pulmonary cryptococosis in patients without HIV infection

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2018
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Abstract
The performance of serum cryptococcal capsular polysaccharide antigen test, histopathology and culture of the lung tissue for diagnosis of pulmonary cryptococosis in patients without HIV infection Ying Zhou,1,* Peng-Cheng Lin,1,* Jun-Ru Ye,1 Shan-Shan Su,1 Li Dong,1 Qing Wu,2 Han-Yan Xu,1 Yu-Peng Xie,1 Yu-Ping Li1 1Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, China; 2The Center of Laboratory and Diagnosis, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, China *These authors contributed equally to this work Background: Clinicians may fail to make an early diagnosis of pulmonary cryptococcosis (PC) without HIV infection. Serum cryptococcal capsular polysaccharide antigen (CrAg) test, histopathology and culture of lung tissue play different roles in diagnosis of PC. Objective: To investigate the performance of serum CrAg test, histopathology and culture of the lung tissue in diagnosis of PC without HIV infection. Patients/methods: From January 2011 to September 2017, patients with proven PC were recruited from a teaching hospital in southern China. Those patients with HIV infection, PC confirmed by surgery or PC with probable or possible diagnosis were excluded from the study. Latex agglutination test and CrAg lateral flow assay were used for detection of serum CrAg. Lung biopsy and needle aspiration were performed under computed tomography guidance. Results: Eighty-nine patients with proven PC including 41 male (46.1%) and 48 female (53.9%) were enrolled. Fifty-one (57.3%) patients had underlying disease. Positive CrAg test was found in 83 (93.3%) cases. Among six cases with negative CrAg test, PC was confirmed by histology in two cases and positive culture in four cases. The histopathological results of 77 (86.5%) cases revealed cryptococcal granuloma and 12 cases showed chronic inflammation, which was confirmed by positive culture. Among 65 cases, the diseased tissue of 46 (70.8%) cases presented Cryptococcus neoformans in the culture and one case was diagnosed with lung cancer coexisting with PC. Conclusion: Our findings showed that serum CrAg test is rapid and sensitive in diagnosing PC, histology is important for confirming PC and culture plays a complementary role. Biopsied lung tissue should be submitted for cultures whenever feasible. Keywords: pulmonary cryptococcosis, fungal infection, Cryptococcus neoformans, cryptococcal capsular polysaccharide antigen, diagnosis
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Authors Ying Zhou;Peng-Cheng Lin;Jun-Ru Ye;Shan-Shan Su;Li Dong;Qing Wu;Han-Yan Xu;Yu-Peng Xie;Yu-Ping Li and
Journal Infection and drug resistance
Year 2018
DOI
10.2147/IDR.S178391
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