Clinical and histological findings on 3 cases of primary chiasma-glioma are reported. Visual disturbance and atypical hemianopsia was the chief complaint of all 3 cases. Moreover, hypothalamic syndrome, that is diabetes inspidus, dystrophia adiposogenitalis, developmental retardation etc. were present. Diagnosis of primary chiasma-glioma was established by craniotomy and tumor tissue was removed for biopsy findings and sufficient dosis of radiation therapy was applied. In 2 cases, the results were excellent and recovery from visual disturbance was remarkable. But in 1 case, radiation was not sufficient because of radiation sickness. Histological findings revealed glioma but classification was very difficult in all 3 cases. The 1st case was a unipolar glioma type, the 2nd case bipolar spongioblastoma type, and the 3rd case polymorphous astrocytoma type. Proliferation of glia fibre was not pronounced in all 3 cases. Histological findings of these cases are reported in detail.

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