CD79A and Hashimoto thyroiditis: Only eleven patients (2.4%) were serologically positive for celiac disease, and two patients with documented villous atrophy were diagnosed with classic celiac disease (0.4%).21 In the Netherlands, Hadithi et al. found that sixteen (15%) out of 104 patients with Hashimoto's thyroiditis were positive for one or a combination of four celiac serological tests (AGA IgA/IgG, EMA and TTG).