What is the purpose of Masson Trichrome stain and which tissues are suitable as controls?

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Multiple Choice

What is the purpose of Masson Trichrome stain and which tissues are suitable as controls?

Masson Trichrome is used to distinguish connective tissue components, especially collagen, from muscle and other tissue elements. It differentially colors collagen fibers blue (or green, depending on variant) while muscle fibers and cytoplasm stain red, with nuclei dark. This contrast makes it ideal for assessing fibrous tissue, fibrosis, and the presence of collagen-rich stroma within tumors. The best answer reflects that purpose: it states that collagen and smooth muscle are differentiated in tumors, which is exactly what this stain enables thanks to its color separation. Using tissues that show both collagen-rich areas (like dermis in skin) and smooth muscle (such as muscular walls of organs or vascular smooth muscle) provides reliable controls to confirm that the stain is producing the expected blue collagen and red muscle colors, while tissues like liver and kidney help demonstrate normal architecture and the absence of artifactual staining. In practice, the staining pattern—blue or green for collagen and red for muscle—helps pathologists evaluate tumor composition and degree of fibrosis, which is why those specific control tissues are appropriate choices.

Masson Trichrome is used to distinguish connective tissue components, especially collagen, from muscle and other tissue elements. It differentially colors collagen fibers blue (or green, depending on variant) while muscle fibers and cytoplasm stain red, with nuclei dark. This contrast makes it ideal for assessing fibrous tissue, fibrosis, and the presence of collagen-rich stroma within tumors.

The best answer reflects that purpose: it states that collagen and smooth muscle are differentiated in tumors, which is exactly what this stain enables thanks to its color separation. Using tissues that show both collagen-rich areas (like dermis in skin) and smooth muscle (such as muscular walls of organs or vascular smooth muscle) provides reliable controls to confirm that the stain is producing the expected blue collagen and red muscle colors, while tissues like liver and kidney help demonstrate normal architecture and the absence of artifactual staining.

In practice, the staining pattern—blue or green for collagen and red for muscle—helps pathologists evaluate tumor composition and degree of fibrosis, which is why those specific control tissues are appropriate choices.

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