A mucocele is any dilatation (typically pathologic) with accumulation of mucus.
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Examples
Diagnosis
Superficial mucoceles can often be diagnosed by appearance and consistency alone. Sometimes, it is indicated to perform diagnostic imaging and/or needle biopsy.
On a CT scan, a mucocele is fairly homogenous, with an attenuation of about 10-18 Hounsfield units.
References
Mucocele Wikipedia(Text) CC BY-SA