Details
Left partial nephrectomy for a tumour measuring 4.8 cm in a 54 year old male.
Mucinous tubular and spindle cell carcinoma is a relatively rare neoplasm, accounting for less than 1% of all renal neoplasms. It is characterized by a low-grade biphasic carcinoma, and it is usually associated with a favorable prognosis. Grossly, it is often a well-circumscribed mass with gray-white to tan or yellow cut surface, usually centered in the medulla of the kidney.
The section shows a well-circumscribed mass with tightly packed elongated, branching tubules lined by low columnar or cuboidal, with uniform, low-grade, round nuclei. There are scattered areas of foamy macrophages among the tubules. The bland spindle cells appear to be intimately admixed with the tubular component. The juxtaposition of these 2 features is typical in mucinous tubular and spindle cell carcinoma.