What is the differential?
Ependymoma or haemangioblastoma are most likely. Astrocytoma including pilocytic astrocytoma should be considered. Cord metastasis is unlikely as they are rare, especially in young patients.
An enhancing nodule is present within the cord at the level of C5 with adjacent peritumoural cysts and extensive cord oedema. Posterior to the lesion a number of serpentine flow voids are noted. The mass has evidence of blood products (previous haemorrhage) and vivid enhancement.