<unk>  is tentatively diagnosed through radiographic examination and must be confirmed by histological examination through biopsy. Radiographically, the tumour area appears as a rounded and well-defined lucency in the bone with varying size and features. Numerous cyst-like radiolucent areas can be seen in larger tumours (multi-locular) giving a characteristic "soap bubble" appearance. A single radiolucent area can be seen in smaller tumours (unilocular). The radiodensity of an<unk>  is<unk> out 30 Hounsfield units, which is<unk> out the same as keratocystic odontogenic tumours. However,<unk> s show more bone expansion and seldom show high density areas. Lingual plate expansion is helpful in diagnosing<unk>  as cysts rarely do this. Resorption of roots of involved teeth can be seen in some cases, but is not unique to<unk> . Differential diagnosis * Keratocystic odontogenic tumour * Central giant-cell granuloma * Odontogenic myxoma
Ameloblastoma
Medulloblastoma
Hemangioblastoma
Sialoblastoma
Neurothekeoma
Glioblastoma
Pineoblastoma
Neuroma