Cystic Metanephric Adenoma
Some metanephric adenomas show papillary areas potentially creating confusion with papillary renal cell carcinomas. The relationship between the two entities is controversial. There are cytogenetic and immunohistochemical differences between them suggesting that the two tumors are distinct. Case courtesy of: Dr. Abdul Haleem, Dept. of Pathology, King Abdul Aziz Hospital, Al-Ahsa, Saudi Arabia.