What are diffuse and nodular goiters?

Goiter is most common thyroid pathology, thyroid dysfunction linked to iodine deficiency. Two types: -Diffuse non toxic goiter (hyperplastic phase [gland diffuse and symmetrical increase in size (max 100-150g), follicules lined with tall epithelia form pseudopapilla, heterogenous appearance across the gland some giant some small], Colloid involution phase) -Multinodular Goiter (cause of largest increase in size [2kg], compresses surrounding organs, multiple nodules sometimes gelatinous colloid, areas of hemorrhage/fibrosis/cystic transformation, inactive follicles/hyperplastic follicles.