{Reference Type}: Case Reports {Title}: Beyond Tumors: Gastric Syphilis Emulating a Gastric Neoplasia. {Author}: Guerrero Muñoz C;Castañeda Agredo A;Romero Valle MJ;Silva Silva AM;León Del Campo M;Azpirtarte Sánchez C;Domínguez Fraga M;Milán Pilo MV;Polo Lorduy BA;González Guirado A;Martín Relloso MJ;Sánchez-Fayos Calabuig P;Bosch Esteva O; {Journal}: Medicina (Kaunas) {Volume}: 60 {Issue}: 4 {Year}: 2024 Apr 13 {Factor}: 2.948 {DOI}: 10.3390/medicina60040629 {Abstract}: We present the case of a 35-year-old male with a first-degree family history of gastric cancer (his father was diagnosed at the age of 45), who was presumed to have gastric cancer himself when evaluating the features of his upper endoscopy performed after hematemesis. Surprisingly, no cancer cells were found in the biopsies. Thanks to a different diagnostic suspicion subsequent to performing a full clinical history, a more favorable diagnosis was reached: gastric syphilis.