Most common cause of mass in posterior mediastinum in children –
Rhabdo sarcoma
Duplication cyst of oesphagus
Lymphoma
Neuroblastoma
"Most common posterior mediastinal masses in children are neurogenic tumors".
 Posterior mediastinal mass in children
1) Neurogenic tumors (Most common)                      
2) Foregut cyst (Second most common)
3)   Lymphoma (Third most common)                     
4) Germ cell tumors
5)   Lymphangiomas and agiomas

Mediastinal neurogenic tumors are
❑ Mediastinal neuroblastoma
❑ Ganglioneuroma                                                                                                          
❑ Ganglioneuroblastoma
❑ Schwannoma      
❑ Mediastinal pheochromocytoma