Rare case of the hyaline vascular type of Castleman''s disease of the kidney

Castleman's disease (CD) is a rare disorder characterized by a benign proliferation of lymphoid tissue. Most cases tend to present as a mediastinal mass. A few extrathoracic cases involving nodal and extranodal locations have previously been reported. To the best of our knowledge, however, only one case of CD of the kidney has been published in an English report. We herein report a rare case of CD presenting as a left renal tumor. A 70-year-old male was examined by computed tomography for a follow-up for colonic diverticulitis and a left renal mass measuring 2.0 cm in diameter was incidentally found. The patient underwent a left partial nephrectomy for a left renal mass and a histopathological analysis demonstrated the hyaline vascular type of CD. Based on our findings, CD should be included in the differential diagnosis of renal tumors.