The adrenal gland is located just above both the kidneys and secretes key hormones which regulate various functions of the body. The gland is divided into the cortex and medulla. The cortex released various hormones such as cortisol, mineralocorticoids which help in daily functioning and diurnal variations in activity levels.
The medulla releases enzymes such as adrenaline, noradrenaline, which mediate the fight or fright response from the sympathetic nervous system.
Tumors can develop in these glands, either from specific areas, or both the cortex and medulla. These can be either benign or malignant.