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There is a large ovoid mass within the thecal sac extending between the L1 and L3 levels with thick irregular peripheral enhancement. There is some peripheral susceptibility artefact with layering blood products. The upper aspect of the mass abuts the conus. The filum terminale appears to be displaced posterior to the mass, rather than incorporated within it, although this is not certain.
There is mass effect on the adjacent nerve roots which are largely compressed posteriorly and laterally and mechanical compression is evidenced by nerve root redundancy above and below the mass, and prominent of the pial veins.
Large intradural mass within the thecal sac with the differential diagnosis of a cystic nerve sheath tumour (schwannoma) and myxopapillary ependymoma.