Odontogenic Tumours Flashcards
how are odontogenic tumours usually discovered
non-eruption of teeth/late stage bony expansion or other imaging
what is the classification of odontogenic tumours
epithelial
mesenchymal
mixed
what are the odontogenic sources of epithelium
rests of malassez
rests of serres
reduce enamel epithelium
name 3 epithelial tumours
ameloblastoma
adenomatoid odontogenic tumour
calcifying epithelial odontogenic tumour
name a mesenchymal tumour
odontogenic myxoma
name a mixed tumour
odontoma
where do ameloblastomas usually occur
posterior mandible
what is the radiological appearance of ameloblastomas
multicystic
(can be unicystic in young patients)
well-defined corticated margins
potentially scalloped margins
thick curved septa giving soap bubble appearance
radiolucent
what happens to the adjacent structures with an ameloblastoma
displacement
thinning of bony cortices
knife edge external root resorption
what is the histology of a follicular ameloblastoma
islands present within fibrous tissue background
islands have ameloblast like cells surrounding them
tissue in middle of follicles
cystic changes within follicles
no connective tissue
what is the histology of plexiform ameloblastoma
ameloblastoma like cells arranged in strands
stellate reticulum
fibrous tissue
no connective tissue
how does the lack of connective tissue in ameloblastomas impact prognosis
means it can easily grow and infiltrate into the jaw causing high recurrence rate
what is the management of ameloblastomas
surgically resect with 1cm margin
if an ameloblastoma turns malignant what is it then called
ameloblastic carcinoma
who usually gets an adenomatoid odontogenic tumour
teenagers
where do adenomatoid odontogenic tumours occur
anterior maxilla
what is an adenomatoid odontogenic tumour associated with
unerupted tooth
(maxillary canine)
what is the appearance of an adenomatoid odontogenic tumour
unilocular radiolucency with internal calcifications around crown of unerupted tooth
well defined corticated margins
what is the histology of an adenomatoid odontogenic tumour
epithelium in duct like structures
degree of calcification reflected in radiological appearance
fibrous tissue capsule
what does the presence of a fibrous tissue capsule in adenomatoid odontogenic tumours mean for prognosis
lower risk of recurrence and easier removal
where do calcifying epithelial odontogenic tumours occur
posterior mandible
what is the presentation of a calcifying epithelial odontogenic tumour
slow growing but large
radiolucency with internal radiopacities
multi or unilocular
well or poorly defined margins
potential internal septa
where do odontogenic myxomas commonly occur
mandible
what is the presentation of an odontogenic myxoma
well-defined radiolucency and thin corticated margin
slow growth along bone
scallops between teeth
what is the histology of an odontogenic myxoma
loose myxoid tissue with stellate cells
islands of inactive odontogenic epithelium
no capsule so is locally invasive
how do you manage an odontogenic myxoma
curettage or resection
what is an odontoma
malformation of a dental tissue similar to teeth
what are the 2 types of odontoma
compound
complex
what is a compound odontoma
ordered dental structures (multiple mini teeth)
anterior maxilla usually
what is a complex odontoma
disorganised mass of dental tissues
more common in posterior mandible
what is the histology of an odontoma
dentine
soft tissue resembling tooth germ
maybe some enamel if it is not fully calcified
