![Bare orbit sign. Frontal CT scan scannogram of the head (A) shows a bare and large orbit on the left, with absence of the greater wing of the left sphenoid bone, in this patient with neurofibromatosis type 1. Note the normal lesser (thick small arrow) and greater (thin long arrow) wings of the sphenoid on the right side. Frontal surface-shaded display, 3D view of the skull (B) shows a large left orbit with dysplasia of the sphenoid wing. Axial CT scan image (C) shows anterior herniation of the left temporal lobe (thin long arrow) because of the dysplastic sphenoid bone. The left globe is small and calcified (phthisis bulbi) (thick short arrow) due to plexiform neurofibromatosis of the left orbit

Chavhan GB, Shroff MM. Twenty classic signs in neuroradiology: A pictorial essay. Indian J Radiol Imaging. 2009 Apr-Jun;19(2):135-45. doi: 10.4103/0971-3026.50835. PMID: 19881070; PMCID: PMC2765171.](attachment:e4e25d96-7752-44c5-b1e3-24e6f2963a79:IJRI-19-135-g011.jpg)

Bare orbit sign. Frontal CT scan scannogram of the head (A) shows a bare and large orbit on the left, with absence of the greater wing of the left sphenoid bone, in this patient with neurofibromatosis type 1. Note the normal lesser (thick small arrow) and greater (thin long arrow) wings of the sphenoid on the right side. Frontal surface-shaded display, 3D view of the skull (B) shows a large left orbit with dysplasia of the sphenoid wing. Axial CT scan image (C) shows anterior herniation of the left temporal lobe (thin long arrow) because of the dysplastic sphenoid bone. The left globe is small and calcified (phthisis bulbi) (thick short arrow) due to plexiform neurofibromatosis of the left orbit

Chavhan GB, Shroff MM. Twenty classic signs in neuroradiology: A pictorial essay. Indian J Radiol Imaging. 2009 Apr-Jun;19(2):135-45. doi: 10.4103/0971-3026.50835. PMID: 19881070; PMCID: PMC2765171.