{Reference Type}: Case Reports
{Title}: Mucinous tubular and spindle cell carcinoma of the kidney: Report of a case with imprint cytologic features.
{Author}: Otani M;Shimizu T;Serizawa H;Nagashima Y;
{Journal}: Acta Cytol
{Volume}: 50
{Issue}: 6
{Year}: Nov-Dec 2006
{Factor}: 3
{DOI}: 10.1159/000326041
{Abstract}: <B>BACKGROUND: </B>Mucinous tubular and spindle cell carcinoma of the kidney is a newly established subtype in the World Health Organization classification. The tumor has a good prognosis, and its diagnosis is clinically important. However, there are no reports of its cytologic features. Here we report the cytologic findings of this rare tumor.<BR><B>METHODS: </B>A 68-year-old female had left-sided abdominal pain, fatigue and hematuria. A large mass in the left kidney was removed. Histologically, the tumor was compatible with mucinous tubular and spindle cell carcinoma. Imprint cytologic examination revealed a large amount of tumor cells arranged in tubular, sheetlike and spindle structures. Some tumor cells showed clear cytoplasm. Nuclear atypia was mild, with occasional distinctive nucleoli.<BR><B>CONCLUSIONS: </B>The cytologic features of mucinous tubular and spindle cell carcinoma have a varied appearance. It should be included in the differential diagnosis to avoid overtreatment.