· Most common type(Between 20-60yrs)
· Slowly progressing pain less swelling
· Pain and rapid exantion if inflammation/infection occurs.
· First swelling is hard,then become thinner and thinner.(creckling sensation->then fluctuent bluish colour swelling when par of the wall is entirely resorbed.
· Epithelium derived from-epithelial cell rests of malassez-stratified squamous epithelium.Hyaline/Rushton bodies may be seen in the epi.
· Cyst capsule-Colagenous fibrous connective tissue.
· Clefts-within the cyst capsule there are often areas split up by the fine needle shaped clefts.
· form in bone in relation to the root of non vital tooth
· arise by epithelial proliferation in an apical granuloma
· usually asymptomatic unless infected
· Diagnosis-radiograph+non vital tooth+histology
· Do not recur after complete enucleation
· Residual cysts can remain after the causative tooth has been extracted and diagnosis is then less obvious
· Cholesterol crystals often seen in the cyst fluid but not specific to radicular cyst.