- Professor Katherine O'Hanlan , Douglas J. Ramos, M.D.
- United States (Stanford)
The largest tumor ever removed intact was a multicystic mass of the right ovary weighing 138.7 kg (306 lb). The operation, which took over six hours, was performed by Professor Katherine O'Hanlan and Douglas J. Ramos, M.D., of Stanford University Medical Center, California, USA. The growth had a diameter of 1 m (3 ft) and was removed in its entirety in October 1991 from the abdomen of an unnamed 34-year-old woman. The patient, who weighed 95 kg (210 lb) after the operation and has made a full recovery, left the operating theater on one stretcher and the cyst on another.