We herein report a rare case of diffuse pulmonary metastasis occurring approximately one year after surgical excision of cutaneous squamous cell carcinoma that had been thought to be stage I with a free margin of healthy tissue. In addition, this case had chest imaging findings unusual for a skin cancer patient, showing a miliary pattern on computed tomography (CT). Distant metastases may develop even if early-stage cutaneous squamous cell carcinoma is completely resected. When observing a miliary shadow on chest CT, metastatic lung tumor from skin cancer should be considered as a differential diagnosis.
Keywords: cutaneous squamous cell carcinoma; miliary shadow; pulmonary metastasis.