6 month old infant comes to physician for follow up. She has: -Difficulties swallowing and feeding since birht. -Weakness in extremities, nystagmus, weak cry. MRI shows: -Small posterior fossa -Downward displacement of cerebellar vermis/cerebellar tonsis/medulla through foraemn magnum. -Fluid fill cavity in cervical cord. 1. What condition does she likely have? 2. What other finding is often seen in this condition?

Neurology is the branch of medicine that focuses on the study, diagnosis, and management of conditions affecting the nervous system.