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Mesoblastic Nephroma : Gross Pathology

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Gross Pathology: Mesoblastic nephroma appears as a single, large, solid, well-circumscribed, unencapsulated mass centered on the hilum of the kidney. The classic variant has a firm, bulging, yellow-tan to gray cut surface with a whorled or trabeculated appearance (shown here) resembling uterine leiomyomas. It lacks areas of hemorrhage or necrosis.

The cellular variant (next image) is softer with a glistening, mucoid surface that lacks trabeculations. It frequently shows foci of cystic change, hemorrhage and necrosis. Image copyright: pathorama.ch.

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