A follicular lumen is the closed cavity within a follicle of the thyroid gland. It is surrounded by follicular cells and filled with colloid, a concentrated solution of thyroglobulin. [ http://en.wikipedia.org/wiki/Follicular_lumen ]

Synonyms: thyroid follicular space thyroid follicle lumen lumen of thyroid follicle

This is just here as a test because I lose it