Grocott's methenamine silver stain

In pathology, the Grocott-Gomori's (or Gömöri) methenamine silver stain, abbreviated GMS, is a popular staining method in histology. The stain was originally named after György Gömori, the Hungarian physician who developed the stain.

A liver biopsy stained using the grocott's methenamine silver stain demonstrating histoplasma (black round balls) in a granuloma.

It is used widely as a screen for fungal organisms. Particularly useful in staining carbohydrates.

It can be used to identify the yeast-like fungus Pneumocystis jiroveci[1] which causes a form of pneumonia called Pneumocystis pneumonia (PCP) or pneumocystosis.

The cell walls of these organisms are outlined by the brown to black stain.

See also


  1. Nassar A, Zapata M, Little JV, Siddiqui MT (November 2006). "Utility of reflex gomori methenamine silver staining for Pneumocystis jirovecii on bronchoalveolar lavage cytologic specimens: A review". Diagn. Cytopathol. 34 (11): 719–23. doi:10.1002/dc.20540. PMID 17041954.
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