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A mass in the right side of the prepontine cistern is largely isodense to CSF but contains some high attenuation strands. It measures approximately 34 x 30 mm in axial diameter and displaces the pons to the left and posteriorly. There is some compression of the fourth ventricle but no dilatation of the lateral or third ventricles. No calcification within the lesion and no haemorrhage.
No intra cerebral lesion elsewhere in the brain. No bone lesion.