Craniopharyngiomas are benign tumours that arise from the remnants of Rathke's pouch (= area between pituitary and 3rd ventricle floor).
Technically it is not a pituitary tumour as it is derived from the embryonic remnants of the pituitary gland rather than the gland itself. However, in terms of the mass effects/how it presents it is very similar. Amenorrhoea and decreased libido are often sited as symptoms.
Craniopharyngiomas frequently calcify (50%)
Investigation of choice is MRI, treatment is surgery.
After that brief squirmish its on to the last battle of the day, the pneumothorax