Which lesion is characteristic of EMV in the lung?

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Multiple Choice

Which lesion is characteristic of EMV in the lung?

The main idea here is the cytopathic effect produced by this virus in lung tissue. EMV tends to cause a fusogenic infection, meaning its viral fusion proteins drive neighboring infected cells to merge. As a result, you get giant multinucleated cells formed by the fusion of multiple epithelial cells—syncytia—in the affected respiratory passages. Histologically, you’d see large cells containing many nuclei, derived from bronchiolar or alveolar epithelium, often with accompanying signs of viral cytopathic change. This specific fusion-driven change is what makes giant multinucleated syncytial cells the characteristic lesion for EMV in the lung. Other patterns like granulomatous inflammation, predominant lymphocytic infiltrates, or unrelated lesions don’t reflect this fusogenic cytopathology.

The main idea here is the cytopathic effect produced by this virus in lung tissue. EMV tends to cause a fusogenic infection, meaning its viral fusion proteins drive neighboring infected cells to merge. As a result, you get giant multinucleated cells formed by the fusion of multiple epithelial cells—syncytia—in the affected respiratory passages. Histologically, you’d see large cells containing many nuclei, derived from bronchiolar or alveolar epithelium, often with accompanying signs of viral cytopathic change. This specific fusion-driven change is what makes giant multinucleated syncytial cells the characteristic lesion for EMV in the lung. Other patterns like granulomatous inflammation, predominant lymphocytic infiltrates, or unrelated lesions don’t reflect this fusogenic cytopathology.

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