A 6 year old boy presents with an acute loss of ability to s…

A 6 year old boy presents with an acute loss of ability to stand. This was preceded by a dramatic onset of headache. On examination he has short stature, microcephaly and bifid right thumb. He is alert and has a power of 2/5 on his right upper limb, 5/5 on the left upper limb, 3/5 on the right lower limb and 5/5 on his left lower limb.  What is the most likely cause of his limb weaknesses?

A 9 year old boy presents with a unilateral headache which o…

A 9 year old boy presents with a unilateral headache which occurs twice a week for the past 6 months. It is not associated with visual or auditory symptoms. The headache lasts about 2 hours and sometimes it is associated with nausea and vomiting. It is relieved by sleep or by painkillers. His systemic examination is normal. What is the most likely diagnosis?