70 y.o. female w/ forehead swelling that grew over 2 years and caused progressive proptosis and loss of vision (Will provide Reference, patient consented). Etiology may surprise you. #neurosurgery #ent 
Mass effect on brain but contents similar attenuation on CT to brain parenchyma
Hint: Slow growth, bony structures w/ thinning and no destruction, no enhancement, homogenous nature, and no vascularity.
Giant frontal mucocele occur due to obstruction of the ostium sinus from inflammation, trauma, mass lesion. They can grow into cranial space & cause meningitis. Dislocated posterior frontal sinus wall fractures can cause. ncbi.nlm.nih.gov/pmc/articles/P…
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