What differentials can be entertained?
The differential diagnosis for a posterior mediastinal mass is broad and includes: neurogenic tumours (schwannoma, neurofibroma, malignant peripheral nerve sheath tumour, neuroblastic tumours, neuroblastoma, or ganglioneuroma), paraspinal abscess, lymphadenopathy or lymphoma, extramedullary haematopoiesis, and foregut duplication cysts.
There is a large mass in the left paravertebral region projected behind the heart on the frontal view. The lungs and pleural spaces are clear. No obvious bony abnormality. The heart size is within normal limits.