<prompt> The International Neuroblastoma Staging System INSS stage 4S includes metastasis to all the following exceptLiverSkinBone marrowBone  <response>: INSS stage 4S refers to neuroblastoma in children younger than 1 yr of age with dissemination to liver, skin, andor bone marrow without bone involvement and with a primary tumor that would otherwise be staged as INSS stage 1 or 2. Reference: Nelson; Neuroblastoma; Page no: 2463 