This document discusses sporadic goiter, also known as non-endemic goiter. It defines sporadic goiter as thyroid enlargement unrelated to iodine deficiency in a certain geographic region, characterized by hyperplastic changes and gland enlargement without signs of hyper- or hypothyroidism. It classifies goiters based on etiology and provides clinical and morphological classifications. It also discusses pathogenesis, physical exam findings, laboratory and imaging tests, biopsy, and treatment options for sporadic goiter.