An ethmoid mucocele is a form of paranasal sinus mucocele involving the ethmoid air cells. Depending on its anterior and/or posterior location, they can also include nasoethmoid and sphenoethmoid mucoceles. Ethmoid mucoceles are considered the second most common in location 2.
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Clinical presentation
Patients are commonly asymptomatic, although can occasionally present with ocular symptoms and signs, such as visual impairment 3, diplopia 5 or proptosis.
Radiographic features
CT
Homogeneously attenuating expansile lesion involving one of the ethmoid air cells, usually with bone thinning. Does not enhance with contrast and does not exhibit destructive features (i.e. outer bony margins are smooth).
MRI
Signal characteristics are similar to that of other paranasal sinus mucoceles.
Differential diagnosis
Possible differential considerations include
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