Is shunt for hydrocephalus visible outside? can it be removed later if csf flow has been restored perfectly? what are the dangers of having a shunt?

It's visible on head: Intracranial shunts are visible on the scalp but if you've hair it's not apparent to the naked eye. The shunt valve is not easily visible but it can be felt. Shunts are very rarely taken out electively once they've been placed. They can be removed for malfunction or infection but are fixed ; replaced. Major complications are either mechanical or infection. In photo, shunt valve is under gauze.

Depends: It really depends on the reason for why the shunt was placed. For the most part, it is placed because there is no reversibility to restore CSF flow. Initial complications of placing a shunt include infection, long-term complications include obstruction or shunt failure. The shunt in tunneled under the skin and can be visible as a tube over the skull or neck.