Introduction: The aim of this report is to describe a rare clinical situation in oncology, a gastric tumor with metastatic implants in subcutaneous tissue. This case demonstrates a rare scenario of gastric adenocarcinoma, with very few cases described in the literature, which evolved with subcutaneous metastases and whereby the role of systemic and even surgical treatment remains unclear. Case Report: The case reported refers to a patient with an advanced gastric adenocarcinoma that evolved with multiple metastases implanted in the subcutaneous tissue, in addition to peritoneal, non-regional lymph nodes, and bone involvement, requiring first-line chemotherapy treatment. Conclusion: This case manifests a rare presentation of advanced gastric neoplasm. The subcutaneous metastasis of internal malignancies is unusual, corresponding to less than 10% of neoplasms. The occurrence of skin or subcutaneous metastasis is still less usual in solid neoplasms, including gastric cancer, with a few cases reported in the literature. In this context, the role of diagnostic medicine is fundamental.