[Langerhans cell histiocytosis of the thyroid: a case report].

Langerhans cell histiocytosis (LCH) is a rare monoclonal disease,its clinical presentation is highly variable because it can affect multiple organs, such as lung, bone, skin, lymph nodes, hypothalamopituitary axis, and other multiple sites. LCH involving the thyroid gland is extremely rare, here we reported a rare case of LCH involving thyroid, presenting as painless thyroid goiters.