Dermoscopy of scalp cutaneous metastasis of sigmoid adenocarcinoma

Abstract

INTRODUCTION Cutaneous metastases from internal malignancy represent approximately 0.001% of all skin biopsies. 1 Cutaneous metastasis is a widespread disease with a poor prognosis. This disease is typically secondary to malignant melanoma, or carcinoma of the lung or the breast and rarely arises from colorectal adenocarcinoma. However, in the event that cutaneous metastases arise from colorectal adenocarcinoma, the abdominal skin is the most common site of involvement. Distant locations are rarely affected, and less than 10 cases have been reportedworldwide in which the cephalic area was affected. Here, we report a rare case of scalp skin metastasis from sigmoid colon adenocarcinoma and describe its dermoscopic features.