Pituitary Hormone Deficiency, Combined, 4, also known as short stature-pituitary and cerebellar defects-small sella turcica syndrome, is related to pituitary hormone deficiency, combined 1. An important gene associated with Pituitary Hormone Deficiency, Combined, 4 is LHX4 (LIM Homeobox 4). Affiliated tissues include pituitary and thyroid, and related phenotypes are small sella turcica and hypothyroidism