toxic goiter, light micrograph

toxic goiter thyroid histology microscopy medical pathology gland enlargement tissue microscope scientific health disease examination diagnosis endocrinology microscopic hormones thyrotoxicosis histopathology condition disorder nodules hyperplasia follicular cells colloid iodinerich endocrine system histological illustration cellular structure dysfunction research anatomical iodine uptake function deficiency thyroxine science graves micrograph light photomicrograph