Jhulan Das, wife of the patient Ratan Das, 53, a small-time trader of Ampi Bazaar in southern Tripura, filed a complaint Saturday in this regard with the police and the state health minister.

In her complaint, she said: "Following the advice of senior doctors, my husband was admitted to the Gobinda Ballav Pant Medical College and Hospital last week. He was to undergo a biopsy of his mouth. But the doctors conducted surgery on his lower abdomen and urethra instead."