Some children will require additional diagnostic imaging procedures, such as computed tomography scan (CAT scan), x ray, and magnetic resonance imaging (MRI), to determine the cause of the macrocephaly and the appropriate treatment.
However, the magnetic field generated during an MRI examination is so strong that metal objects or objects with metal in them, such as jewelry, eyeglasses, oxygen canisters, and even wheelchairs, will be pulled toward the machine.
If the rare infection malignant otitis externa is suspected, computed tomography scan (CT scan) or magnetic resonance imaging (MRI) scans will be performed to determine how widely the infection has spread within bone and tissue.
If there is no history of a recent infection, the doctor will order tests such as a commuted topography (CT) scan or a magnetic resonance imaging (MRI) scan to help rule out other possible causes of vertigo, such as tumors.
This type is usually diagnosed in adolescence or early adulthood when symptoms most commonly appear; however, with the availability of magnetic resonance imaging (MRI), many children are diagnosed at a much younger age.
Occasionally, magnetic resonance imaging (MRI) is used as a diagnostic tool, primarily to look more closely at the condition of the spinal cord and nerve roots extending from it if neurological problems are suspected.
Cardiac MRI, a scanning method that uses magnetic fields and radio waves to create three-dimensional images of the heart, can help physicians evaluate congenital cardiovascular defects, but is not always necessary.
Laboratory tests are helpful but not as important as the individual patient's symptoms and signs, family history, and complete neurological evaluation including a magnetic resonance imaging (MRI) scan of the brain.
Only one type of MRI scan, called a magnetic resonance cholangiopancreatography (MRCP), which scans the bile ducts, requires that the child not eat or drink anything for two to three hours prior to the scan.
In addition, it means that usable MRI images can be obtained in a very short period of time (1.5-2 minutes on average) rather than the longer periods of testing required when radioactive materials are used.