This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Leisegang rings are found in: 
Select and explain. 
A. Calcifying epithelial odontogenic cyst, B. Primordial cyst, C. Calcifying epithelial odontogenic tumor, D. Odontoma
C: Calcifying epithelial odontogenic tumor
Answer: C: Calcifying epithelial odontogenic tumor 
Explanation: Characteristic feature of the Calcifying epithelial odontogenic tumor (Pindborg tumour) is the presence of calcification, sometimes in large amounts and often in the form of Liesegang rings.
This calcification actually appears to occur in some instances in globules of the amyloid-like material, many of which have coalesced and are transformed from being PAS (periodic acid-Schiff)-negative to PAS-positive during this calcification process. There does not appear to be necessarily a relationship between the amount of amyloid material formed in a given lesion and the amount of calcification occurring.