HAVANA - Alan Gross, the American government contractor jailed in Cuba for crimes against the state, could be suffering from an untreated cancer, according to an independent review of his medical records, his US lawyer said on Tuesday.

"Gross has a potentially life-threatening medical problem that has not been adequately evaluated to modern medical standards," US-based radiologist Alan Cohen said in a statement released by Gross attorney Jared Genser.

Genser said Cohen had reviewed CT and ultrasound scans performed by Cuban doctors of an unidentified mass behind Gross's right shoulder, which wife Judy Gross cited after a recent visit to her husband.

The Cuban physicians diagnosed the mass as a "hematoma" and told Gross in May that it would disappear within a few months, according to Genser.

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