Goiter

Goiter is swelling of the thyroid gland, this lead to swelling of the neck or larynx. This is an enlargement of the thyroid referred to as thyromegaly.  Hypothyroidism is related to goiter, the symptoms are weight loss and heat intolerance. Hypothyroidism is when the thyroid gland do not produce enough of thyroid hormones thyroxine and triiodothyronine. The most common cause of goiter is iodine deficiency, mostly where there is a lack of iodized salt. Worldwide 90.54 percent is caused by the lack of iodine. There is three different growth patterns uninodular (struma uninodosa), multinodular (struma nodosa), diffuse (struma diffuse). It size is classified in three different sizes class I (palpation struma) : can not be seen, class II: can be easily seen, class III: very large.

http://en.wikipedia.org/wiki/Goitre

http://en.wikipedia.org/wiki/File:Thyroid,_Diffuse_Hyperplasia.jpg

http://medicalpicturesinfo.com/goiter/