Zosteriform Cutaneous Metastases: A Literature Meta‐Analysis and a Clinical Report of Three Melanoma Cases

BACKGROUND Despite frequent skin involvement with solid tumors, zosteriform metastases are a rare, not well‐defined entity, with only few cases published in literature. The unifying characteristic is merely topographic: cutaneous lesions were distributed along dermatomes, despite the variety of clinical features, including vesicobullous, papular, and nodular lesions. Several theories have been proposed to explain the pathogenetic mechanism of zosteriform dissemination, even if none was adequately proved. OBJECTIVE In this article, we report three new cases of patients with melanoma with skin zosteriform metastases and present a meta‐analysis of literature data. METHODS AND MATERIALS We collected all Entrez‐PubMed articles about zosteriform skin metastasis since 1970 and reviewed 56 cases, including our own taken from a 4,774‐patient series. RESULTS The histotypes mainly implicated were melanoma (18%); lymphoma (14%); breast cancer (12%); squamous cell carcinoma (12%); and digestive (10.7%), respiratory (10.7%), and urinary tumors (7%), with other histotypes accounting for 14%. In only one case in our series did we describe a typical herpetiform pattern, whereas in the others we found papulonodular lesions with a dermatomeric distribution. CONCLUSION Cutaneous metastases with zosteriform pattern are rare and show a wide clinicopathologic spectrum that could affect the disease course.