An announcement came Monday from the group, which is canceling its tour dates and postponing an album release.
A statement says the tumor was found early. It's confined to one area and is considered very treatable.
He will need surgery and other treatment, but the statement says his vocal cords will not be affected.
The 43-year-old Yauch is not only part of the pioneering rap group, but has also emerged as a film producer.
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