Question 98 · LDEK · Benign tumors
Indicate the true statements concerning the keratocystic odontogenic tumour (KCOT):
1) KCOT derives from the dental-forming epithelium, and its source could be remnants of the dental lamina and the cells of basal layers of the epithelial mucosa;
2) most often KCOTs are located in the mandible (according to various sources 65-83% of cases); half of them in the region of the angle;
3) KCOT located in the maxilla penetrates very slowly the maxillary sinus;
4) there are two basic types of KCOT developing intraosseously: parakeratotic and ortokeratotic;
5) in the beginning KCOT radiologically takes the form of a small, oval or circular multilocular intraosseous clearing, which is poorly demarcated and has no distinct osteosclerotic sheath.
The correct answer is:
2) most often KCOTs are located in the mandible (according to various sources 65-83% of cases); half of them in the region of the angle;
3) KCOT located in the maxilla penetrates very slowly the maxillary sinus;
4) there are two basic types of KCOT developing intraosseously: parakeratotic and ortokeratotic;
5) in the beginning KCOT radiologically takes the form of a small, oval or circular multilocular intraosseous clearing, which is poorly demarcated and has no distinct osteosclerotic sheath.
The correct answer is:
- A. 1,2,3.
- B. 2,3,4.
- C. 2,5.
- D. 3,5.
- E. 1,2,4.
Hint
Recall the origin of KCOT, its favourite site, how it behaves in the maxilla and what its early radiological margins look like.
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