What is meant by nodular thickening of the left adrenal gland related to hyperplasia without well defined nodule?

Size and location: The adrenal glands can increase in size due to hyperplasia (usually bilateral) or a tumor (adenoma or carcinoma). However, hyperplasia may give rise to a thickening of the gland by imaging. There is also nodular hyperplasia, which is often related to specific hormone production (cortisol, aldosterone, etc). Not sure if you are symptomatic.