A Large Extragnathic Keratocystic Odontogenic Tumour

Figure 5

(a) Hematoxylin and eosin stained histopathological section of the lesion showing cystic epithelium of odontogenic keratocyst with numerous infoldings (×40). (b) Corresponding IHC image showing nuclear expression of Ki-67 seen continuously in the basal layer (×40). (c) High power view showing 5–7 cell layer thick, corrugated parakeratinized cystic epithelium with columnar basal cells exhibiting palisading nuclear polarity (H&E stain, ×200). (d) Corresponding IHC image showing nuclear expression of Ki-67 continuously in the basal layer and sparsely in the parabasal layer. Superficial layers are completely free of Ki-67 expression (×200).

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