What is the differential diagnosis? Which do you favour and why?
Metastasis and hemangioblastoma are the two most likely diagnoses. The age of the patient and absence of flow voids should push you towards metastasis.
What is the role of neurosurgical resection of brain metastases?
Cerebral metastases, especially posterior fossa metastases, often impact negatively on patient palliation and as such in many instances, especially when a solitary or dominant metastasis is present, resection may be beneficial. Posterior fossa lesions can result in hydrocephalus, and as such are more likely to benefit from resection.
MRI demonstrates a partially cystic enhancing nodule in the inferior aspect of the right cerebellar hemisphere. No haemorrhage or flow voids is evident. On the single coronal image, there does not appear to be significant hydrocephalus.