Hashimoto's thyroiditis,all are TRUE except-

In Hashimoto's thyroiditis, there is a marked lymphocytic infiltration of the thyroid with germinal center formation, atrophy of the thyroid follicles accompanied by oxyphil metaplasia, absence of colloid, and mild to moderate fibrosis. Its incidence increases with age (mean age at diagnosis is 60 yrs). Patients with Hashimoto's thyroiditis may present because of goiter rather than symptoms of hypothyroidism. The goiter may not be large, but it is usually irregular and firm in consistency. Reference : page 2290-91 Harrison's Principles of Internal Medicine 19th edition