"I wish to inform you that a biopsy of the lesion that Mr. Gross has behind his right shoulder was performed on October 24 last, which confirmed that said lesion is not carcinogenic. The biopsy tested negative for neoplastic cells and it was confirmed that the lesion is made up by isolated muscle cells and extensive areas of red blood-cells that could be associated to a hematoma," José Ramón Cabañas, chief of the Cuban Interests Section in Washington, D.C., wrote in a letter dated Nov. 28, 2012 that was obtained by ABC News. "This test could not be performed before due to Mr. Gross's refusal."
Despite the Cuban official's assurances, Shneyer said, "There are still concerns about the lump on his shoulder."
In today's request from the State Department, Toner asked that the Cuban government "grant Alan Gross's request to travel to the United States to visit his 90-year-old mother, Evelyn Gross, who is gravely ill," calling it a "humanitarian issue."
The letter from Cabañas included a summary of the U.S. case against a group of Cubans, known as the "Cuban Five," being held on espionage charges, about whom he said Cuba has "legitimate humanitarian concerns."
ABC News' Dana Hughes contributed to this report.