MRI of the pituitary should be would becould very well be considered necessary whilst GH deficiency is suspected to rule out structural reasons
https://marioylyf390.scriblorax.com/posts/hgh-and-height-can-growth-hormone-help-children-grow-taller
MRI of the pituitary is perhaps needed when GH deficiency is suspected to rule out structural causes and to securely plan medicine techniques.