What is the diagnostic method for Pneumocystis carinii according to the material?

What is the diagnostic method for Pneumocystis carinii according to the material?

• A. Surgical lung biopsy
• B. Bronchoscopy with lavage
• C. CT-guided biopsy
• D. Sputum culture

Answer: (A)

The main idea here is that Pneumocystis pneumonia is diagnosed by directly demonstrating the organism in lung tissue. According to the material, obtaining lung tissue through surgical lung biopsy provides the definitive evidence you need: the tissue can be examined histologically, and Pneumocystis organisms can be seen in the alveolar spaces using special stains (such as Gomori methenamine silver) or immunofluorescent techniques. This approach is particularly emphasized when less invasive tests don’t yield a conclusive result, because culture of Pneumocystis is not routinely reliable and noninvasive samples may be nondiagnostic. Bronchoscopy with lavage is less invasive and often used in practice, but the material highlights tissue diagnosis via biopsy as the diagnostic method. CT-guided biopsy could be used for focal lesions, which is not typical for Pneumocystis pneumonia, and sputum culture does not reliably grow Pneumocystis, so it isn’t diagnostic.

The main idea here is that Pneumocystis pneumonia is diagnosed by directly demonstrating the organism in lung tissue. According to the material, obtaining lung tissue through surgical lung biopsy provides the definitive evidence you need: the tissue can be examined histologically, and Pneumocystis organisms can be seen in the alveolar spaces using special stains (such as Gomori methenamine silver) or immunofluorescent techniques. This approach is particularly emphasized when less invasive tests don’t yield a conclusive result, because culture of Pneumocystis is not routinely reliable and noninvasive samples may be nondiagnostic.

Bronchoscopy with lavage is less invasive and often used in practice, but the material highlights tissue diagnosis via biopsy as the diagnostic method. CT-guided biopsy could be used for focal lesions, which is not typical for Pneumocystis pneumonia, and sputum culture does not reliably grow Pneumocystis, so it isn’t diagnostic.