Abstract
The development of immune checkpoint inhibitors such as programmed cell-death receptor 1 (PD-1) antagonists has rapidly advanced chemotherapy within the last several decades. PD-1 targeted immunotherapy drugs like pembrolizumab, ipilimumab, nivolumab, and durvalumab have known associations with several immune-mediated dermatological reactions. We report a case in which an elderly male experienced segmental vitiligo after use of durvalumab therapy for small cell lung cancer. Distinct from non-segmental vitiligo, segmental vitiligo presents in a unilateral blaschkoid distribution and typically does not cross the midline. To our knowledge, checkpoint inhibitor-induced segmental vitiligo has yet to be documented.
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