What is diffusely heterogeneous thyroid gland mean? Also have a 5x5 mm calcified nodule in upper left thyroid lobe. Help me understand this? Thx.

Nodule. Heterogeneous gland means you don't have a smooth gland. This typical happens in pts with autoimmune thyroid disease where the gland is attacked by antibodies. Thyroid nodules are common and mostly benign. You have 1 nodule and it's very small. You can just watch it for now. See your doctor for more personalized explanation.