Rep. Joaquin Castro of Texas announced Monday that he had undergone successful surgery to remove tumors discovered last summer in the lining of his gastrointestinal tract. The tumors were identified as gastrointestinal neuroendocrine tumors, which are rare and slow-growing. Castro said his prognosis is good and he expects to return to Washington, D.C. in several weeks to continue his work for the people of San Antonio. He thanked the medical staff, his family, friends, and constituents for their support.