abnormal adrenal gland x-zone size enlarged adrenal gland x-zone 2014-04-29T00:00:00Z MP:0020145 MPheno.ontology enlarged adrenal gland x zone increased size of the x-zone compared to the average on the pair of endocrine glands located above the kidney that are responsible for steroid hormone secretion from the cortex and neurotransmitter (such as epinephrine and norepinephrine) secretion from the medulla nvasilevsky