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Description:This Grocott's methenamine silver-stained (GMS) photomicrograph reveals some of the cytoarchitectural pathology found in a lung tissue sample extracted from a patient ill with pulmonary pneumocystosis. Of importance, you’ll note the presence of Pneumocystis jirovecii, formerly Pneumocystis carinii, fungal organisms in the alveolar spaces.
The specific diagnosis is based on identification of P. jirovecii in bronchopulmonary secretions obtained as induced sputum, or bronchoalveolar lavage (BAL) material. In situations where these two techniques cannot be used, transbronchial biopsy or open lung biopsy may prove necessary. Microscopic identification of P. jirovecii trophozoites and cysts is performed with stains that demonstrate either the nuclei of trophozoites and intracystic stages (such as Giemsa) or the cyst walls (such as the silver stains). In addition, immunofluorescence microscopy using monoclonal antibodies can identify the organisms with higher sensitivity than conventional microscopy.
High Resolution: Click here for hi-resolution image (18.36 MB)
Content Providers(s):CDC/ Francis W. Chandler, DVM, PhD
Creation Date:1986
Photo Credit:
Links:CDC – Div. of Parasitic Diseases (DPDx); Pneumocystis infection
CDC – Emerging Infectious Diseases, Pneumocystis jirovecii in General Population”, by Francisco J. Medrano, et. al., Vol. 11, No. 2 – February, 2005, Research
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.