Cytological diagnosis of mesoblastic nephroma: A report of three cases with summary of prior published cases.

Congenital mesoblastic nephroma (CMN) is a rare pediatric renal neoplasm, occurring most commonly in the first few months of life, with a favourable clinical outcome. Accurate pre-operative cytological diagnosis of this entity is important as pre-operative chemotherapy is not recommended and surgery is the treatment of choice. Cytodiagnosis of this rare tumor is discussed in only a few case reports. Here two cases of CMN and one case of cellular congenital mesoblastic nephroma (CCMN) diagnosed on FNAC along with their morphological differential diagnoses has been reported. They also take this opportunity to compare the cytological features of CMN with cellular CMN. Diagn. Cytopathol. 2016;44:823-827. © 2016 Wiley Periodicals, Inc.