When Jeannie Noth Gaffigan experienced gradual hearing loss in her left ear, she was sent for a routine MRI. Noth Gaffigan, who, with her husband, is the co-writer of “The Jim Gaffigan Show,” and the mother of their five children, was stunned when the results of her scan revealed a large left-sided tumor in the posterior fossa — a small space located near the brainstem.