<prompt> The most common site of neuroblastoma is ___Posterior mediastinumAdrenal medullaParaveebral sympathetic chain in abdomenSkull  <response>: The most common sites of primary tumors are the adrenal gland 30, paraveebral retroperitoneum 28, posterior mediastinum 15, pelvis 5 and cervical area. Cervical neuroblastoma can present with Horner syndrome. Reference: Essential paediatrics; O.P.Ghai; Childhood Malignancies; Page no: 616 