"Question ID","Question","Discussion","Answer","Year" "20021202","Primary Site--Head & Neck (Middle ear): How do you code site for a skull based tumor consistent with a low grade papillary adenocarcinoma of ""endolymphatic sac origin""?","","Code Primary Site to C30.1 [Middle ear]. The endolymphatic sac is part of the inner ear labyrinth located with in the petrous portion of the temporal bone.","2002"