Photomicrographs showing diagnostic pitfalls for keratinized odontogenic cysts. (A) Parakeratosis and hyperchromatic palisaded basal cells in a keratocyst (HE ×175). (B) Odontogenic orthokeratinized cyst are covered by a lamellar hyperorthokeratosis and don't have polarization features within their basal cell layer (HE ×175). (C) Inflammation mask histological characteristics of keratocyst (HE ×175). (D) Transition between an inflamed non-specific epithelium (*) and a non-inflamed parakeratinized epithelium (**) within a keratocyst (HE ×400).