Metanephric Adenoma : Gross Pathology
Section Editor: Dharam M. Ramnani, MD
Virginia Urology, Richmond, VA, USA
Image Description
Gross Pathology: Metanephric adenomas (MA) are generally unilateral, solitary, well-circumscribed and unencapsulated tumors that are sharply demarcated from the adjacent normal kidney. Rare cases have discontinuous or continuous capsule.
The cut surface is solid, homogenous and light tan, yellow, or gray in color. The tumor size ranges from 0.5 to >15 cm, with a mean diameter of 5 to 6 cm. Foci of hemorrhage, necrosis, or cystic degeneration may be present. Some tumors show areas of calcification and may even be entirely calcified in rare instances.
This 3.0 cm metanephric adenoma in the upper pole of the kidney was detected on the CT scan of abdomen during work-up for microscopic hematuria in a 50 y/o female. The tumor bulges out of the upper pole but there was no capsular invasion.
The cut surface is solid, homogenous and light tan, yellow, or gray in color. The tumor size ranges from 0.5 to >15 cm, with a mean diameter of 5 to 6 cm. Foci of hemorrhage, necrosis, or cystic degeneration may be present. Some tumors show areas of calcification and may even be entirely calcified in rare instances.
This 3.0 cm metanephric adenoma in the upper pole of the kidney was detected on the CT scan of abdomen during work-up for microscopic hematuria in a 50 y/o female. The tumor bulges out of the upper pole but there was no capsular invasion.