Segmental vitiligo-like hypopigmentation associated with metastatic melanoma.

VOLUME 99, JUNE 2017 E1 WWW.CUTIS.COM To the Editor: Melanoma-associated hypopigmentation frequently has been reported during the disease course and can include different characteristics such as regression of the primary melanoma and/or its metastases as well as common vitiligolike hypopigmentation at sites distant from the melanoma.1,2 Among patients who present with hypopigmentation, the most common clinical presentation is hypopigmented patches in a bilateral symmetric distribution that is similar to vitiligo.1 We report a case of segmental vitiligo–like hypopigmentation associated with melanoma. A 37-year-old man presented with achromic patches on the right side of the neck and lower face of 2 months’ duration. He had a history of melanoma (Breslow thickness, 1.37 mm; mitotic rate, 4/mm2) on the right retroauricular region that was treated by wide local excision 12 years prior; after 10 years, he began to have headaches. At that time, imaging studies including computed tomography, magnetic resonance imaging, and positron emission tomography–computed tomography revealed multiple nodules on the brain, lungs, pancreas, left scapula, and left suprarenal gland. A lung biopsy confirmed metastatic melanoma. Intravenous fotemustine (100 mg/m2 weekly for 3 weeks) was initiated, followed by maintenance treatment (100 mg/m2 once daily for 5 days) every 4 weeks. On physical examination using a Wood lamp at the current presentation 2 months later, the achromic patches were linearly distributed on the inferior portion of the right cheek (Figure). A 2×3-cm atrophic scar was present on the right retroauricular region. No regional or distant lymph nodes were enlarged or hard on examination. Although vitiligo is diagnosed using clinical findings,3 a biopsy was performed and showed absence of melanocytes at the dermoepidermal junction (hematoxylin and eosin stain) and complete absence of melanin pigment (Fontana-Masson stain). The patient was treated with topical tacrolimus with poor improvement after 2 months. The relationship between melanoma and vitiligolike hypopigmentation is a fascinating and controversial topic. Its association is considered to be a consequence of the immune-mediated response against antigens shared by normal melanocytes and melanoma cells.4 Vitiligolike hypopigmentation occurs in 2.8%2 of melanoma patients and is reported in metastatic disease1 as well as those undergoing immunotherapy with or without chemotherapy.5 Its development in patients with stage III or IV melanoma seems to represent an independent positive Segmental Vitiligo–like Hypopigmentation Associated With Metastatic Melanoma