type-6 epithelial cell of thymus 2010-09-13T02:37:26Z cystic thymic epithelial cells large medullary thymic epithelial cells FMA:72214 A thymic epithelial cell that has an eccentric, round, or irregularly shaped hetero or euchromatic nucleus. The hallmark of this cell type is the presence of vacuoles, which are clustered in one area of the cytoplasm in the vicinity of the nucleus. The vacuoles are small and acquire a grape-like form, occasionally showing delicate internal microvillous projections. large mTEC medullary thymic epithelial cell