Fig. 4.

Immunohistochemical features. a CK19 was diffusely positive in both the cyst wall and solid nest (arrows, cysts wall; arrowheads, solid nest). b CK7 was focal positive indicating that there were no duct structures. c SMA was negative in the solid nest and stromal cells, whereas the internal control was positive. d Nuclear accumulation of β-catenin was detected (arrows, positive cells; left figure, cyst wall component; right figure, solid nest). e Dentin matrix protein-1 was positive in the cell nuclei with dentinoid material deposition (arrows, positive cells). f The Ki-67 index was low. Scale bar = 500 µm (a), 50 µm (b–f). Images were taken using an OLYMPUA BX53 and scaled with PLYMPUS cellSens Standard