Mucocoeles develop from paranasal sinuses. They are epithelium-lined, mucus containing lesions and present as slowly enlarging masses. The frontal sinus is most commonly involved, whereas sphenoid, ethmoid and maxillary mucocoeles are rare. Accumulation of mucus secretion, generally, is caused by paranasal sinus inflammation, fibrosis, trauma, previous surgery, anatomical abnormality, or mass lesion such as osteoma. Mucocoeles can spread both intraorbitally and intracranially.
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