The radicular cysts represent the majority of all cysts maxillo-facial. It is nominated paradentais called cysts, periodontal, or apical root. The epithelium proceeds from epithelial rests of Malassez traces originated in the sheath of Hertwig. The transformation of these cells of epithelial cysts decay can occur with consequent necrosis pulp is formed as a defensive reaction granulomas hyperplastic front of a persistent inflammatory stimulus and not heavy. Treatment involves surgical enucleation. The rate of occurrence is low. Female patient, 30 years old, with 3 days of illness in taste, painless, making it difficult to feed. On physical examination notes the oroscopy a partially toothed mouth, with teeth in regular waste condition. The bombment the hard palate, approximately 2 cm in diameter, slightly painful, floating compatible with nasopalatine cyst. Rest of physical exam within normal parameters. Held tomography simple, where one finds the formation of cysts in relation to the medial left maxillary sinus, reaching the midline, over the posterosuperior central and lateral incisors, including the roots thereof. It is realized held curettage drainage and cyst. It is sent material for cultivation, in which negative returns. It is sent material for pathology, which tells fibrous cyst wall partially covered by squamous epithelium without atypia. Getting to the final diagnosis of radicular cyst periapical over the left central and lateral incisors. It is realized undertake follow-up no signs of recurrence.