Hi. The apparent signs of elevated intracranial pressure, such as headaches, vomiting and lethargy would make the suspicion a shunt malfunction obvious. If your child has these symptoms, a CT or MRI scan may be used to compare the ventricular size from previous scans and show the most definitive signs of a malfunction. In cases where scanning shows no evidence, the next step involves a strictly aseptic shunt tap test. However, tapping the shunt is invasive and carries a risk of infection. Once the blocked shunt is replaced promptly, full recovery can be anticipated. Hope this helps.
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