Factor(s) that would be consistent with a finding of Hashimoto's thyroiditis
(Right) Struma lymphomatosa in Hashimoto thyroiditis, gross. Note: diffuse, pale yellow infiltrate affecting the entire thyroid. The yellow infiltrate is caused by an influx of lymphocytes, which may form follicles. Normal thyroid (Left) copyright 1999 KUMC Pathology and the University of Kansas, used with permission; courtesy of Dr. James Fishback, Department of Pathology, University of Kansas Medical Center.