Male patient, 48 years old, came to dental clinic for a routine visit. After panoramic radiography, it is evident the presence of large dimensions radiolucent image, unilocular and edges defined in the anterior mandibular region. The history revealed the occurrence of trauma to the anterior mandibular region. Enucleation of the lesion and guided bone regeneration with resorbable synthetic bone substitute and membrane was made. Schlagwörter: radicular cyst, trauma