A 45-year-old female patient came to our OP with chief complaint of pain in left lower back tooth region for past 6 months. Patient was apparently normal before 6 months, then she developed pain in relation to left lower mandibular region which was dull, intermittent and aggravated on mastication. There was no significant medical or family history. After routine clinical examination, radiographic investigation was planned and explained to patient. Initially IOPA was taken, which revealed well-defined radiopaque mass structure. Then, to know about the exact location and the size of the mass structure, OPG was taken which again revealed well-defined radiopaque structure measuring approximately about 1.5 x 1.5 cm in dimension. Because of pain in that region, biopsy was planned under local anaesthesia and informed consent was obtained from the patient. Then, the mass structure was removed, and the specimen was sent to histopathological examination, which revealed the presence of enamel dentin pulp and cementum suggestive of a complex odontoma. An eccentric odontoma is a hamartomatous lesion or malformation of odontogenic origin, in which both epithelial and mesenchymal cells reveal complete differentiation and all the dental tissues are represented. Though all structures may be present, it will be mostly in a disorderly model not resembling a tooth. 1 The term "odontoma" was coined by Paul Broca in 1867. Broca defined the term as tumours formed by the overgrowth of dental tissue. 2 World Health Organisation (WHO) classified it based upon their gross and radiographic features into compound (small tooth like structures) or complex (a conglomeration of dentin, enamel and cementum). 3 A deformity in which all dental tissues are formed, but taking place in less orderly pattern is complex odontoma. A deformity in which all dental tissues are arranged in a more orderly pattern is compound odontoma. 4
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