Superficial siderosis of the nervous system

A male patient had been operated in 1990 at a different hospital for a suprasellar mass lesion causing progressive blindness. At exploration, the mass was felt to be inflammatory in nature with arachnoiditis and hydrocephalus. Deep yellow staining of tissues round the mass was recorded at the time of first surgery. The patient was readmitted in 1996 for progressive visual failure, ataxia, mental changes and deafness. MRI confirmed persistence of suprasellar mass and showed the characteristic findings of superficial siderosis of CNS. On reexploration, the mass had multiple vessels over the walls and contained xanthochromic fluid. It was excised and histologically examined to be an epidermoid with a cyst. The patient developed chest infection, became drowsy and died. The MRI picture, the CSF finding and the yellow staining of tissue confirmed the diagnosis of superficial siderosis of the CNS, which was first thought of after seeing the diagnostic MRI. The cause of the superficial siderosis was recurrent bleeding from the tumour.