Uncommon Presentation of a Residual Cyst

Purpose Residual cysts are inflammatory cysts of the jaws that develop when epithelium associated with a previous cyst is not completely removed. These cysts are often asymptomatic and discovered incidentally during radiologic examinations of edentulous areas. This case report documents an uncommon presentation of a residual cyst with internal calcifications.Methodology This study is a case report. An 82-year-old male patient presented to our clinic, where full mouth imaging revealed a corticated radiolucency extending from the area of tooth no. 8 to the area of tooth no. 13. CBCT imaging showe curvilinear calcification at the epicenter of the lesion. Following the biopsy with oral surgery and microscopic examination with oral pathology, the lesion was diagnosed as residual cyst.Conclusion This case report underscores the complexity of radiographic differential diagnosis and the importance of evaluating the patient, particularly when a lesion presents with atypical radiographic features.Impact The findings of this case report contribute to the existing literature on the diagnosis and management of residual cysts, particularly those with uncommon presentations. By documenting the diagnostic journey of a residual cyst characterized by an initial mixed-density appearance, this report emphasizes the critical role of a holistic approach in developing a differential diagnosis.