Dexter Manley, the former All-Pro defensive end for the Washington Redskins, underwent 10? hours of brain surgery Wednesday and, as expected, is experiencing minor, isolated memory loss. According to his wife, Lydia, Manley was hospitalized June 16 after police found him "disoriented." She said a CT scan showed an enlarged colloid cyst that was collecting fluid and causing increased intracranial pressure. Doctors recommended surgery, and Manley, 48, is now resting in the intensive care unit at Georgetown University Hospital. His prognosis is for a relatively full recovery, although doctors have told his wife that memory loss is a common side effect of the operation.