Cancer of the adrenal cortex, a rare cancer, is a disease in which cancer (malignant) cells are found in the adrenal cortex, which is the outside layer of the adrenal gland. Cancer of the adrenal cortex is also called adrenocortical carcinoma. There are two adrenal glands, one above each kidney in the back of the upper abdomen. The adrenal glands are also called the suprarenal glands. The inside layer of the adrenal gland is called the adrenal medulla.