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so many thanks for your kind and prompt answers. Below i will paste a report, from a colleague of a surgeon that my brother knows, who was privvy to my dad's scans.
Diffuse glyoma grade 4, started in one region (left occipital lobe) but appears to be crossing the central pathway and also heading down to the basal ganglia. Central is 4cm but has many arms. Considered inoperable, suggested course of radiotherapy, median expectancy 9 months. I saw the MRI scans in detail and even I could tell that an operation would be impossible, there seemed to be so many parts to it. Immediate prognosis is gradual loss of use of right arm and leg, but this is actually secondary as the tumour spreads forward. It is aggressive and fast growing. RT will only be to hold things at bay. Not expected to treat the tumour at all and may be irrelevant.