Heterogeneous thyroid, my ultrasound stated that diffusely heterogeneous thyroid with no discrete cystic or solid nodule identified.

Autoimmune thyroid?: Autoimmune thyroid disease can cause the description that you just described. Heterogenicity can occur due to destruction of thyroid antibodies.

May be autoimmune: Heterogeneous thyroid on ultrasound refers to a thyroid that looks mottled with both dark and light areas throughout. This is a typical finding in people with autoimmune thyroid disease such as hashimoto's thyroiditis or grave's disease. It sounds like there is nothing suspicious that would require biopsy.