The huge 68lb growth was removed from Stoja Popovic after the woman had let it grow and grow without ever going to the doctor.
The woman had flat-out refused to go, despite growing concerns from friends and family about the ever larger lump that had starting to protrude from her belly over the years.
She explained: "At first I thought I was putting on weight, but very soon I realised there was something wrong. But I didn't feel pain... so I just continued to live as usual."
Experts at the Bosnian University Clinical Centre in the capital Sarajevo said the tumour had to be removed immediately.
I would have never gone to a doctor if I hadn’t hurt my leg
Stoja, from Banja Luka in Bosnia, is now recovering from the surgery at home after having spent a few days in hospital.
A statement from the hospital read: "The diagnosis confirmed the existence of a tumour of a large size inside her abdomen. Due to the extensive surgery, several specialists from the Department of Obstetrics and Gynaecology were included in the team as well as some from the Clinic for Plastic and Reconstructive Surgery.
"The surgery lasted four hours and ended successfully."