When doctor say dentigerous cyst is "atypical" what do they penny-pinching?

When doctor say dentigerous cyst is "atypical" what do they penny-pinching?
The definition of "atypical" is irregular or unusual.
This is how the World Health Organization (WHO) grades tumors.
Grade I is benign, slow growing
Grades II and III are atypical, aggressive growth
Grade IV is malignant
Ask your DOCTOR, moron!
That is a autosomal dominate disorder,that produces abnormal dentin,to be precise a dull bluish to brown discoloration,that does not provide the teeth with all right strength,to withstand occulional( when teeth come together) stresses.The teeth are rapidly worn down by run of the mill chewing etc. Atypical= means not everyday or unusual. Dentin= is denser than bone,and makes up the body of the tooth. Take protection. SW RNP