2003 年 42 巻 3 号 p. 258-259
A 5-year-old boy admitted for abdominal pain and brownish urine was found in CT to have a 10 × 10 cm mass, in the left kidney, necessitating nephrectomy. Histological diagnosis was nephroblastic nephroblastoma. Imprint cytology showed a randomly diffuse proliferation of cells with round nuclei and sparse cytoplasm, partly forming an acinar structure. Overlapping clusters of spindle cells were also present. Cytology of nephrobastoma has seldom reported. In diagnosing this rare disease, however, it would be helpful to be aware of the cytological findings of nephroblastoma.