Lateral Periodontal Cyst

Etiology • Stimulus unknown • Dental lamina remnant proliferation within the alveolar
segment of the jaw, separate from the periodontal ligament
Clinical Presentation • Asymptomatic • Usually occurs in fourth decade and beyond • Usually in mandibular canine/premolar region (65%) • In the maxilla, the lateral incisor area predominates.
Radiographic Findings • Well delineated, round to ovoid lucency with thin, opaque
(corticated) margin • Located lateral to vital tooth roots • Usually unilocular; may be multilocular (botryoid odontogenic
cyst)

Glandular Odontogenic Cyst

Etiology • A developmental odontogenic cyst • A unique jaw cyst with microscopic evidence of glandular differentiation
Clinical Presentation • Slow growing; may be expansile • Located chiefly in the anterior mandible • May present a lateral periodontal relationship
Radiographic Findings • Usually a multilocular cystic radiolucency • Sharply defined with hyperostotic margins • May be extensive, locally invasive; may perforate cortical bone
Diagnosis • Radiographic qualities • Incisional biopsy results show cystic epithelium with mucous
cells and pseudoduct formation

Eruption Cyst

Etiology • Soft tissue cyst of attached gingiva secondary to fluid accumu-
lation within the follicular space of an unerupted tooth
Clinical Presentation • Gingival swelling on the alveolar crest • Usually soft, translucent to bluish (“eruption hematoma”)
Diagnosis • Location • Radiographic demonstration of erupting tooth