Abstract
B-cell chronic lymphocytic leukemia (CLL), a low-grade malignancy consisting of CD5(+), CD23(+), and CD43(+) small B lymphocytes, is the most frequent leukemia in the western world. Patients with CLL may exhibit skin changes characterized by histopathologic evidence of infiltration by atypical B lymphocytes, also known as "specific cutaneous infiltrates of CLL"; in addition, CLL is known to be associated with an increased risk of second cancers, including Kaposi sarcoma (KS). The combination of KS and CLL within the same cutaneous biopsy specimen has only rarely been described. We report a peculiar case of KS occurring in a patient with CLL, in which histopathological evaluation of KS lesions revealed prominent accumulation of CLL lymphocytes within neoplastic vascular spaces. We believe that our findings represent a novel example of intravascular colonization of vascular neoplasms by neoplastic lymphoid cells, further expanding the evergrowing spectrum of specific cutaneous infiltrates of CLL.
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