Abstract
A randomized, placebo-controlled trial including 43 patients with hypothyroidism caused by chronic autoimmune thyroiditis without nodules on ultrasonography study (US) was conducted from March 2006 to March 2009. Among them, 23 were submitted to low-level laser therapy (LLLT) and 20 to placebo. The LLLT was effective in improving the echogenicity, the volume and of the thyroid vasculariza…