CategoriesPeriapical Radiolucencies – pulpal origin Periapical granuloma Radicular cyst Periapical Abscess Surgical defect Osteomyelitis, periapical Periapical Radiolucencies – non pulpal origin Cementoma (periapical cemental dysplasia) 1st stage Simple bone cyst (traumatic cyst) Nasopalatine duct cyst Eosinophilic granuloma (Langerhans cell histiocytosis) Periodontitis Pericoronal Radiolucencies Dental follicle Pericoronitis Dentigerous (follicular) cyst Buccal biffurcation cyst Mural Ameloblastoma Adenomatoid odontogenic tumor (AOT) Interradicular Lateral periodontal cyst Lateral radicular cyst Globulomaxillary cyst Nasopalatine duct cyst Simple bone cyst (traumatic cyst) Solitary (Cyst-like) Radiolucencies Tooth germ (early stage) Bone marrow cavity Residual cyst Odontogenic keratocyst (circumscribed) Ameloblastoma (circumscribed) Stafne’s bone cavity (Lingual salivary gland depression) Central giant cell granuloma (circumscribed) Cemento-Ossifying fibroma (1st stage) Benign tumors of neural origin Primordial cyst (Keratocyst) Multiple Radiolucencies Multiple cysts of the jaws Langerhans cell histiocytosis (eosinophilic granuloma) Multiple myeloma Metastatic tumors (multiple) Multilocular Radiolucencies Odontogenic keratocyst (multilocular) Ameloblastoma (multilocular) Odontogenic myxoma Central giant cell granuloma (Multilocular) Aneurysmal bone cyst Hemangioma, central Cherubism Odontogenic fibroma, central Malignant lymphoma (multilocular) Ill-defined Radiolucencies Osteomyelitis (ill defined) Squamous cell carcinoma Eosinophilic granuloma (Langerhans cell histiocytosis) Malignant lymphoma (ill defined) Metastatic tumors (ill defined) Osteogenic sarcoma (osteosarcoma) Ewing sarcoma Malignant salivary gland tumors Generalized rarefactions Hyperparathyroidism Osteoporosis Thalassemia Sickle cell anemia Leukemia Osteomalacia – Rickets Residual cyst . Residual cyst develops after the incomplete removal of a pre-existing cyst. It may occur at any age and usually is asymptomatic. Radiographically is a unilocular radiolucency with well-defined and most often well-corticated borders. Differential Diagnosis Odontogenic keratocyst (circumscribed) Case 1 Residual cyst in left side of maxilla Case 2 Asymptomatic residual cyst in the right side of the mandible
