MALIGNANT-LYMPHOMA WITH MYXOID CHANGE AND SARCOMATOUS FEATURES

We report a case of unusual B-cell malignant lymphoma of the kidney an d mediastinum. Renal biopsy showed prominent myxoid changes and sarcom atous features, leading to considerable difficulty in histologic diagn osis on routinely stained histologic sections. However, immunohistoche mical staining for lymphocyte markers led to the final histologic diag nosis of B-cell malignant lymphoma. Although myxoid change is not gene rally found in malignant lymphoma, malignant lymphoma should not be ex cluded from consideration when one encounters a small round cell sarco ma with myxoid stroma, especially in extranodal soft tissue tumors.