Primary renal lymphoma of mucosa-associated lymphoid tissue.

Mucosa-associated lymphoid tissue-type lymphomas have recently been recognized as a distinctive form of B-cell malignant lymphoma. In contrast to other types of low-grade lymphomas, these tumors have a tendency to be localized at diagnosis and to be curable with local therapy. We report an unusual case of primary localized low-grade lymphoma of mucosa-associated lymphoid tissue arising in the kidney. The patient underwent radical nephrectomy and was free of disease at 28 months of follow-up without additional treatment. Once properly staged and classified, lymphoma of mucosa-associated lymphoid tissue involving the kidney can be managed by radical nephrectomy and follow-up.