Janardhan Dwivedi said the "surgery is over [and] the surgeon had indicated that it was successful".
Mrs Gandhi was "likely to be away for two to three weeks", he said.
Mrs Gandhi, 64, is India's most powerful politician. She holds no official post.
But many consider her the de facto head of the government.
Mr Dwivedi said Mrs Gandhi was recovering in an intensive care unit of a hospital.
India has some of the best medical facilities and doctors in the world and speculation is rife as to why Mrs Gandhi chose to go elsewhere for surgery.
Some reports suggest she may need specialist treatment not yet available in India, but these are unconfirmed.
"As this is a personal matter that pertains to her health and medical treatment, her family requests that her privacy be respected," Mr Dwivedi said.
Yen vietyen sao to yen Cong dung yen sao nuoc yen mua yen sao
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