Where at in the head does a brain tumor cause pressure?

Any place: A large enough tumour can cause increased pressure in skull cavity no matter where it is located. However even relatively small tumors in posterior fossa cavity of skull can lead to high intra cranial pressure.

Pain, not pressure: Small brain tumors may cause pain, by irritating nerves in the lining of the skull (the dura/meninges). This pain could be perceived in many locations around the head, neck and face. Also, many brain tumors are discovered because an MRI is done to investigate a headache complaint, even though the tumor may have nothing to do with the headache.