[The transcallosal approach--surgical technics]

The transcallosal access as a surgical route to the supratentorial ventricular system is discussed. The experience gained in 31 microneurosurgical interventions with this access is dealt with. This route in particular permits an assessment of the local operability. Among the 25 histologically confirmed tumours of this region 19 belonged to the neuroepithelial tumours. Because of the peculiarities of this tumour type the final results are unsatisfactory in spite of the microsurgical procedure and the utilisation of an optimum access.