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The optic chiasm is one of the most important structures in neuro ophthalmologic diagnosis. The  arrangement of visual fibres in the chiasm accounts for            characteristic defects in the visual fields caused by such  diverse processes as compression , inflammation , demyelination, ischemia and infiltration. Two cases are  presented here. The first case presented with right temporal field defect with central scotoma of the left eye and bilateral papilledema. MRI SCAN showed it as suprasellar   astrocytoma. The second case presented with temporal field defect and left eye optic atrophy. MRI SCAN showed it as pituitary macro adenoma or dorsal sella meningioma. Thus showing the importance of ocular examination in identifying intracranial tumours.


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