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Ameloblastoma & Ameloblastic fibroma (Conventional solid …
Ameloblastoma
&
Ameloblastic fibroma
Conventional solid
(multicystic intraosseous ameloblastoma)
Follicular pattern
Histology
Core
Stellate reticulum
Peripheral
Tall columnar ameloblast-like cell
Reverse polarity nucleus
Cyst formation
Plexiform pattern
Histology
cord
Anastomosing of odontogenic epithelium
Peripheral
Cuboidal amloblast-like cell
Radiographic features
Mutilocular radiolucency
Honeycombed appearance
Soap bubble appearance
Unilocular radiolucency
Root resorption
Epidermiology
Third to seventh decade of life
Location
Mandible (80-85%)
Maxillary (15-20%)
Unicystic ameloblastoma
Luminal unicystic ameloblastoma
Histology
Fibrous cyst wall
Stella the reticulum
Ameloblastic epithelium
Radiographic features
Radiolucency at post. portion of mandible
CT imaging
Intraluminal mass
Intraluminal unicystic ameloblastoma
Histology
Plexiform nodules ameloblastoma
Mural unicystic ameloblastoma
Histology
Ameloblastoma nodules
Fibrous connective tissue wall
Epidemiology
Found in second decades of life
90% found in post. Region of mandible
Peripheral ameloblastoma
Histopathologic features
Ameloblastic epithelium Islands
Plexiform and follicular pattern are most common
Epidimiology
Uncommon and accounts for about 1-4% of all ameloblastoma
Middle-aged person
More common in mandible than maxilla
Clinical features
Painless swelling of jaw
Slow growing lesion
Asymptomatic
Pain and paresthesia (uncommon)
Differential diagnosis
Dentigerous cyst
Odontogenic keratocyst
Odontogenic myxoma
Ameloblastic fibroma
Clinical features
Asymptomatic
Large lesion may associated with swelling of jaw
Epidemiology
First two decades of life
More common in male than female
70% found in posterior mandible
Radiographic features
Unilocular, multilocular
Radiolucency
Well-defined, corticated margin
Histology
Mesenchymal pattern
Plump stellate cells
Plump ovoid cells
Epithelial pattern
Long narrow cords of odontogenic epithelium
Two cells in thickness
Cuboidal/columnar cells
Small discrete islands