Does having a pituitary tumor shorten your lifespan?

Pituitary tumor. It really depends on the type of tumor, its surgical removal or treatment by therapy. Some of these tumors are benign and with treatment can lead to a normal lifespan - it is all based on the tumor type and the available treatment.
No. The answer depends on the size of the tumor (> or < 1cm) and whether or not it is producing any hormones. The most common type of pituitary tumor is a non-functioning tumor. This type, if small and not affecting the optic chiasm, does not cause any problems and does not "shorten your lifespan.".