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Comparison of performances of laboratory methods in diagnosing pulmonary cryptococcosis in 1508 patients having lung biopsy tissues collected: a 6-year retrospective study
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Comparison of performances of laboratory methods in diagnosing pulmonary cryptococcosis in 1508 patients having lung biopsy tissues collected: a 6-year retrospective study
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Comparison of performances of laboratory methods in diagnosing pulmonary cryptococcosis in 1508 patients having lung biopsy tissues collected: a 6-year retrospective study
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Journal Article
Comparison of performances of laboratory methods in diagnosing pulmonary cryptococcosis in 1508 patients having lung biopsy tissues collected: a 6-year retrospective study
2024
Overview
PurposeThe diagnosis of pulmonary cryptococcosis (PC) remains challenging, particularly in patients presenting with lobar or patchy consolidation on chest radiographs. Biopsies are sometimes performed for histopathologic examination and microbiological culture to differentiate infections, including PC, from lung cancers. However, to date, the clinical value of small biopsy samples and their reasonable processing methods for detecting Cryptococcus are rarely evaluated. Furthermore, the cryptococcal antigen (CrAg) test has been widely used in cryptococcosis diagnosis due to its high specificity. This 6-year retrospective study aimed to assess the efficacy of four tests commonly used for detecting Cryptococcus in the diagnosis of pulmonary cryptococcosis, and reveal that the combination of 2 or 3 methods would raise diagnosis sensitivity.MethodsThe results of CrAg test, histopathologic examination and routine cryptococcal culture of sputum/bronchoalveolar lavage fluid (BALF) were collected from hospitalized patients between June 2019 to May 2024. Additionally, the results of 4 above-mentioned methods were analyzed to compare their effectiveness in PC diagnosis.ResultsAmong 1508 patients whose biopsy specimens were sent for pathogen detection, 63 PC cases were diagnosed, and 24 C. neoformans strains were cultivated using the Myco/F Lytic culture, which was more than those by sputum/BALF culture (9 strains). CrAg was positive in 82.5% (52/63) PC patients and remained the most sensitive method. The combination of CrAg and biopsy culture will increase the overall diagnostic yield to 95.2% (60/63).ConclusionsIn summary, for those having biopsy tissue collected, the combination of CrAg and biopsy culture using Myco/F could effectively identify most PC cases.
Publisher
Springer Nature B.V
Subject
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