What are five causes of a posterior mediastinal mass?

1. Neurogenic tumor (most common): 95% arise from sympathetic ganglion cells, 5% from peripheral nerves
Neuroblastoma (patients younger than 2 years): least differentiated, most malignant
Ganglioneuroblastoma (patients younger than 10 years)
Ganglioneuroma (patients 6 to 15 years)
Neurofibroma or schwannoma (patients older than 20 years)
2. Neurenteric cyst
3. Extramedullary hematopoiesis
4. Adjacent lung mass, sequestration
5. Lateral meningocele