CT SCAN (COMPUTERISED AXIAL TOMAGRAPHY)

This is a sophisticated x-ray that is carried out without any risk to the patient. It is obtained by the patient lying on a table which then moves the head into a doughnut shaped scanner. It normally takes about 10 minutes.

MRI SCAN (MAGNETIC RESONANCE IMAGINING)

This provides more detailed information than a CT scan and is only required for some tumours. In this case the table slides into a tunnel. It takes about 20 minutes to complete. This scanner is quite noisy and is often described as sounding like a washing machine. As this is based on magnetic fields, all metal objects such as pins or clips are removed before entering the MRI room.

Other tests

BLOOD TESTS

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EEG

This test is sometimes performed before CT scanning for patients who present initially with fits. It involves placement of a series of small electrodes on the scalp which are used to record electrical brain wave signals.

ANGIOGRAM

This is a test performed in the x-ray department whereby a dye is injected into the groin and a series or x-rays are taken of the head whilst the dye is circulating in the blood vessels within the head. It is sometimes necessary before surgery to provide more information on tumours which are close to major blood vessels. Occasionally, such tumours may be treated with a technique called embolization at the same sitting to reduce their blood supply before surgery. When this is planned, the radiologist visits the ward and explains the procedure to the patient beforehand.

VISION/HEARING/BALANCE TESTS

These special tests are performed as part of the routine work-up for certain tumours in certain locations.