The lateral periodontal lateral cyst (LPC) is an uncommon developmental odontogenic cyst defined as a radiolucent lesion which develops along the lateral aspect of an erupted vital tooth. LPC represents approximately 0.8% to 2% of all odontogenic cysts. The most frequently reported location of a lateral periodontal cyst is the mandibular caninepremolar area, followed by the anterior region of the maxilla. The lateral periodontal cyst is usually asymptomatic and presents as a round, oval or teardrop-like well-circumscribed inter-radicular radiolucent area, usually with a sclerotic margin lying between the apex and cervical margin of the teeth. The lateral periodontal cyst usually is seen in the fifth to sixth decade of life with a male preponderance. This paper reports an atypical case of an inter-radicular radiolucent cystic lesion in located between the mandibular central incisor and the canine area in an 87-year-old female patient mimicking clinically and radiographically as a residual cyst but histopathologically
confirmed as a lateral periodontal cyst.
