Abstract
Four reticulosarcomas presenting as butterfly tumours are described. In all 4 cases, tumour was not found outside the brain. It turned out that reticulosarcomas in our series comprised nearly 1/3 of all butterfly tumours, whereas 1/3 of the reticulosarcomas of the brain showed this location. In view of the inoperability of butterfly tumours and the possible radiosensitivity of reticulosarcomas, it is urged, in a case of a butterfly tumour, to try to establish the diagnosis before any decision as to treatment is made.

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