<prompt> Tumours of anterior mediastinum include the following exceptThymomaLymphomaGerm cell tumourSchwannoma  <response>: Schwannoma is a benign nerve sheath tumor arising from Schwannneurilemmalcells.Anterior mediastinal tumors include retrosternal goitre,aoic arch aneurysm,lymph node enlargement,thymoma,teratomas,dermoid,Pleuro-pericardial cyst. 