Left orbital mass. There is a smoothly expansile mass involving the left superior lateral orbit extending into the left frontal sinus measuring approximately 2.4 x 2.8 x 2.8 cm in the AP, transverse, and craniocaudal dimensions. Mass exhibits diffuse T1 hyperintensity without fat suppression. No associated enhancement is demonstrated. Smooth expansile osseous changes are better appreciated on recent CT. There is mass effect on the left globe which appears inferiorly displaced and mildly compressed. There is mild left-sided proptosis. Adjacent structures including the lacrimal gland and superior rectus muscle are also displaced. No abnormal signal within the optic nerves.There is dehiscence of the left orbital roof. The inner table of the left frontal calvarium is severely thinned based on recent CT. There is partial opacification of the left anterior ethmoid air cells and minimal elsewhere.No significant mass effect on the adjacent left frontal lobe parenchyma. Brain parenchyma is unremarkable without evidence of edema, infarct, or hemorrhage. No abnormal parenchymal or meningeal enhancement. No hydrocephalus or extra-axial collections. Major flow-voids are preserved. Remainder of the bone marrow signal and extracranial soft tissues are unremarkable.
1. Smoothly expansile mass involving the left superolateral orbit and left frontal sinus is most consistent with a mucocele. There is mass effect on the left globe which is inferiorly displaced and mildly compressed.2. There is dehiscence of the left orbital roof and significant thinning/questionable dehiscence of the inner table of the left frontal bone.