PMC5340050_01
(a) Axial non-contrast computed tomography shows a well-defined, mixed density intraosseous abnormal lesion near the right orbital apex, extending through greater wing of sphenoid and bulging into the superior orbital fissure. The lesion appears predominantly isodense to brain (+26 Hounsfield units) with few areas of intralesion fat density (-71 Hounsfield units). (b) MRI T1-weighted image showing well defined, iso to hyper intense intraosseous abnormal lesion arrowhead) near the right orbital apex, extending through greater wing of sphenoid and bulging into the superior orbital fissure. (c and d) MRI STIR axial and coronal images exhibiting area of fat suppression (arrowhead) in the abnormal intraosseous lesion near the right orbital apex, extending through greater wing of sphenoid and bulging into the superior orbital fissure, again confirming the fat component of the lesion, thus signalling towards dermoid cyst.
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F1
The lesion appeared predominantly isodense to brain with few areas of intralesional fat density [Figure 1a]. Magnetic resonance imaging (MRI) T1-weighted images revealed an iso- to hyperintense intraosseous lesion extending through the greater wing of sphenoid into the superior orbital fissure near the apex of the orbit [Figure 1b]. MRI STIR images showed suppression of the hyperintensity seen in T1 weighted images, confirming the characteristic fat component of the lesion [Figures 1c and d].