A 10-ten-month old girl is referred to the neurosurgical out-patient clinic by a GP with a history of increasing head circumference, outside of normal parameters, and failure to thrive.

What is the most likely diagnosis? (1 mark)

What is the most common congenital anatomical cause of this condition? (1 mark)

209Give one classification for this condition. (1 mark)

What congenital central nervous system (CNS) disorder is often associated with this clinical presentation? (1 mark)

Give the clinical findings you may expect on examination. (3 marks)

What investigation may be performed in order to confirm the diagnosis? (1 mark)

What is the possible management option in this patient, and explain how it works? (2 marks)