Hydrocephalus:

It is not a specific disease but complications of many intracranial acquired or congenital diseases. It results from impaired circulation and absorption of CSF. The clinical features depends upon the duration and rate of rise of intracranial pressure. The earliest sign in a child could be enlarging occipitofrontal circumference and the late sign could be setting sun eye sign as in this child. Long tract signs due to stretching of the pyramidal tract is also seen.