Which finding best differentiates Graves disease from toxic multinodular goiter?

Which finding best differentiates Graves disease from toxic multinodular goiter?

• A. Diffuse thyroid enlargement with ophthalmopathy
• B. Nodular goiter with eye involvement
• C. Diffuse goiter without ophthalmopathy
• D. Hypothyroidism

Answer: (A)

Graves disease is an autoimmune hyperthyroidism where stimulating antibodies to the TSH receptor cause diffuse thyroid activation and often also involve orbital tissues, leading to ophthalmopathy. Toxic multinodular goiter, by contrast, results from autonomous thyroid nodules producing hormone, giving a nodular, nonuniform thyroid enlargement and generally no eye involvement. Because eye findings are distinctive and strongly associated with Graves, the best way to differentiate the two is the presence of diffuse thyroid enlargement with ophthalmopathy. The nodular pattern without eye disease points away from Graves, and eye involvement alone without diffuse enlargement isn’t typical for toxic multinodular goiter.

Graves disease is an autoimmune hyperthyroidism where stimulating antibodies to the TSH receptor cause diffuse thyroid activation and often also involve orbital tissues, leading to ophthalmopathy. Toxic multinodular goiter, by contrast, results from autonomous thyroid nodules producing hormone, giving a nodular, nonuniform thyroid enlargement and generally no eye involvement. Because eye findings are distinctive and strongly associated with Graves, the best way to differentiate the two is the presence of diffuse thyroid enlargement with ophthalmopathy. The nodular pattern without eye disease points away from Graves, and eye involvement alone without diffuse enlargement isn’t typical for toxic multinodular goiter.