Background: Cystic partially differentiated nephroblastoma (CPDN) is an uncommon childhood kidney tumor.
Case: For the first time, in this case report we describe the cytologic features of this entity. Predominant clusters and rows of cells with occasional discrete blastemal cells on cytologic smear along with multiple hypoechoic cystic spaces on radiology suggested CPDN.
Conclusion: It is essential to diagnose CPDN preoperatively because the tumor needs only nephrectomy for treatment.