A 6 year old boy has been complaining of headache, ignoring to see the objects on the sides for four months. On examination he is not mentally retarded, his grades at school are good, and visual acuity is diminished in both the eyes. Visual chaing showed significant field defect. CT scan of the head showed suprasellar mass with calcification. Which of the following is the most probable diagnosis?
Astrocytoma Craniopharyngioma Pituitary adenoma Meningioma