1. There is a well-defined monolocular scalloped-shape radiolucence with a cortical margin between the root of the 35 and 37 extending from the distal of 35 to the root tip of 37 squeezing along the root outline ， measuring approximately 4 × 2 cm in diameter. The involved teeth from 35 to 37 are still alive with lamina dura.

2. Trauma bone cyst well-defined (corticated) radiolucence asymptomatic beyond 20 years old 60% male common in the mandibular premolar and molar areas margin along the root ， not push vital teeth scallop(several teeth)

3. lateral periodontal cyst Same-- male prefer asymptomatic corticated round radiolucency along the lateral root surface in alveolar bone Different-- old ages often in mandibular premolar-canine-lateral incicor area(rarely in molars) some are botryoid round lucency(botryoid odontogenic cyst)

4. aneurysmal bone cyst(ABC) same— well defined unilocular radiolucency different— large blood-filled spaces often described as "soap bubble" teeth moved and roots resorption

5. odontogenic keratocyst(OKC) Same— scalloping asymptomatic different– wide age range multiple(about10%) teeth moved and roots resorption

6. glangular odontogenetic cyst(GOC) same— painless scalloping different— usually anterior mandible middle aged teeth moved and roots resorption