Fine needle aspiration cytology of clear cell sarcoma of the kidney. A case report.

BACKGROUND

Fine needle aspiration cytology is an established method for cytodiagnosis. Its application is particularly suited to the pediatric age group. A correct cytodiagnosis of especially large tumors can result in timely cytoreductive chemotherapy, thereby facilitating surgery. While the cytomorphology of Wilms' tumor is well documented, there is a paucity of literature concerning other uncommon pediatric renal tumors.

CASE

A 2-year-old female underwent surgery for a renal mass following aspiration cytology. The histologic diagnosis was clear cell sarcoma of the kidney (CCSK). The cytologic smears were cellular and pleomorphic. The main feature of cytologic interest was the presence of deep nuclear indentations and grooves in many of the tumor cells.

CONCLUSION

The cytologic features of CCSK are distinct and different from those of other renal tumors in children. Its recognition in cytology is important because its behavior is more aggressive than that of Wilms' tumor. A correct diagnosis can result in the institution of appropriate treatment.