Se presenta el caso de una paciente de 52 años de edad que acudió a la consulta de Ginecología por un aumento de volumen en el abdomen. Se le indicó ingreso, se estudió y se diagnosticó un tumor gigante de víscera ginecológica. Se decide tratamiento quirúrgico mediante laparatomía. Durante el acto quirúrgico se demuestra que la tumoración corresponde a la vejiga, por lo que se solicita la presencia de un urólogo. Continuamos la intervención y encontramos una tumoración grande, de base ancha, que ocupa la parte posterior y lateral izquierda de la vejiga, con áreas de necrosis de color blanquecino y consistencia algo blanda. Se cateteriza el meato ureteral derecho, el izquierdo no es visible y se realiza la exéresis del tumor. Se deja una sonda Foley No. 20 por cistostomía y uretral, se cierra la vejiga en dos planos y se revisa la cavidad abdominal. Se encontraron útero y ovarios normales; colón, intestino e hígado normales. En el estudio histológico se demostró que la tumoración es un rabdomiosarcoma pleomórfico. Se siguió su evolución y se realizaron interconsultas con el servicio de oncología para el tratamiento posteriorThe case of a 52-year-old female patient that was seen at the Gynecology office due to an increase of volume in the abdomen, is reported. She was admitted, studied and diagnosed a giant tumor of gynecological viscus. It was decided to perform laparotomy. During surgery, it was observed that the tumor corresponded to the urinary bladder, so an urologist was requested. The operation continued and a big tumor of wide base was found that occupied the posterior and lateral left part of the urinary bladder, with necrosis areas of whitish color and a little soft consistency. The right ureteral meatus was catheterized, the left was not visible, and exeresis of the tumor was performed. A Foley catheter no. 20 was left by cystotomy. The urinary bladder was closed in 2 planes, and the abdominal cavity was checked. Normal uterus, ovaries, colon, intestine and liver were found. In the histological study, it was proved that the tumor was a pleomorphic rhabdomyosarcoma. Its evolution was followed and interconsultations were made with the oncology service for further treatment