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Supernumerary tooth is a developmental anomaly and has been argued to arise from multiple etiologies. In general, hyperdontia is of two types according to shape: Supplemental (teeth of normal shape and size) and rudimentary (teeth of abnormal shape and size which include conical, tuberculate, and molariform types). We hereby present a case of a 7-year-old male child who reported with a crescent-shaped white mass in the anterior part of palate since 6 months with associated pain and swelling for past 1 week. The mass was excised under local anesthesia. On clinical, radiographic, and histological examination a crescent-shaped white mass measuring 1.3 mm×0.5 mm×0.5 mm showing the normal thickness of enamel, dentin, and cementum enclosing a pulp space was seen. Hence, a diagnosis of crescent-shaped supernumerary tooth was given.

Incisive canal cyst or nasopalatine duct cysts (NPDCs) are the most common non-odontogenic cysts of the maxilla. These are the common intraosseous developmental cyst occurring in the midline of the maxillary anterior region. They are usually asymptomatic and are discovered incidentally during the routine radiographic examination. They can be described as a well-circumscribed radiolucency between the root apices of the maxillary central incisors. Since these lesions show diagnostic dilemma in clinical and radiological study, a definitive diagnosis is required to be confirmed by histopathology. Surgical approach with enucleation of the cyst is the definitive treatment of NPDC. Hereby, we report an unusual presentation of NPDCs mimicking as residual cyst which was associated with missing upper anterior teeth.