A Rare Case of Lymph Node Metastasis Of Hepatoid Adenocarcinoma of the Stomach Presenting as an Abdominal Tumor

BACKGROUND Hepatoid adenocarcinoma of the stomach(HAS)is a rare subtype of gastric cancer, which is often misdiagnosed or missed in clinical work due to the lack of case characteristics and other reasons. It is rarer for HAS metastasizes to lymph nodes and manifests as an abdominal tumor. CASE SUMMARY A 58-year-old man came to the hospital for treatment due to elevated AFP. After enhanced CT and MRI, we found a round like tumor near the duodenum. Due to the patient's economic factors, the patient refused PET-CT and gastroscopy. We found and removed this tumor after laparoscopic exploration. The postoperative pathological diagnosis was hepatoid adenocarcinoma; see residual lymphoid tissue and lymphoid follicular structure. To clarify its origin, gastroscopy revealed gastric adenocarcinoma in the gastric horn. Based on pathological diagnosis, we consider HAS lymph node metastasis CONCLUSION We found a rare case of gastric hepatoid adenocarcinoma. Only gastric adenocarcinoma was present in the stomach. The hepatoid adenocarcinoma area metastasized to gastric lymph nodes. And it is very rare to be found clinically in the form of abdominal cavity tumor. This special location and the rarity of gastric hepatoid adenocarcinoma make clinicians prone to misdiagnosis or missed diagnosis. We hope that this report can provide references for the clinical diagnosis and treatment of this kind of rare cancer