Omar Salim underwent the surgery at the Sir Ganga Ram Hospital (SGRH) on January 31, which lasted for seven hours. He was discharged today.
"He came to us last October, with complaints of a large mass in abdomen and abdominal pain for a year. A previous attempt at surgery in his country had failed in view of the extent of the disease," the hospital said in a statement.
"There was another large mass in the left lobe of liver occupying nearly the whole of the left upper abdomen. Biopsy revealed a diagnosis of rectal GIST (Gastro Intestinal Stromal Tumour)," the statement said.
The liver tumour measured 15 x 14 cm and weighed 1.2 kg, while the rectal tumour was 24 x 13 cm in size and weighed 1.9 kg. Despite the extent of the tumour and surgery, the patient did not require any blood transfusion during the operation, the hospital said.
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Sharing the challenge involved, he said, there was very limited working space as most of the space was occupied by the tumour.
"Presence of vital structures in the area, including the urinary bladder and ureters, and nerves supplying the muscles which work to ensure proper urinary function, increased the complexity of the operation," he said.