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Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Axial non enhanced CT of the brain demonstrates an expansile mass involving both frontal sinuses, with most involvement in the left frontal sinus. The lesion has sclerotic and fibrous components, the former along its anterior aspect and the latter along its supero-posterior aspect; it measured 5.4 x 4.0 x 4.0 cm (maximum transverse, anteroposterior, and craniocaudal dimensions respectively) . The fibrous component causes thinning, and in some regions erosion of the posterior cortex of the left frontal sinus wall and extended inferiorly into the ipsilateral frontoethmoid recess. The dense component scalloped the anterior frontal sinus cortex and eroded through the left orbital roof with minimal impingement on superior rectus muscle resulting in minimal secondary proptosis. Technique: KVp = 120; mA = 37; Slice Thickness = 5.00 mm.

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Axial non enhanced CT of the brain in bone window demonstrates an expansile mass involving both frontal sinuses, with most involvement in the left frontal sinus. The lesion has sclerotic and fibrous components, the former along its anterior aspect and the latter along its supero-posterior aspect; it measured 5.4 x 4.0 x 4.0 cm (maximum transverse, anteroposterior, and craniocaudal dimensions respectively) . The fibrous component causes thinning, and in some regions erosion of the posterior cortex of the left frontal sinus wall and extended inferiorly into the ipsilateral frontoethmoid recess. The dense component scalloped the anterior frontal sinus cortex and eroded through the left orbital roof with minimal impingement on superior rectus muscle resulting in minimal secondary proptosis. Technique: KVp = 120; mA = 37; Slice Thickness = 5.00 mm.

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Axial noncontrast fast spin echo T2 weighted MRI images through the brain. The sclerotic component on CT scan shows low signal intensity on T1W and T2W images and no enhancement. The fibrous component on the other hand is of intermediate signal intensity on both unenhanced sequences and shows avid enhancement following intravenous contrast administration. The soft tissue component seen on CT consistent with secretions, has intermediate T1W and bright T2W signal intensity and shows faint peripheral enhancement. [1.5 Tesla (TR/TE = 4000 msec./112 msec.) Slice Thickness = 5.00 mm].

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Axial FLAIR images through the brain. The sclerotic component on CT scan shows low signal intensity on T1W and T2W images and no enhancement. The fibrous component on the other hand is of intermediate signal intensity on both unenhanced sequences and shows avid enhancement following intravenous contrast administration. The soft tissue component seen on CT consistent with secretions, has intermediate T1W and bright T2W signal intensity and shows faint peripheral enhancement.

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Axial noncontrast T1 weighted MRI images through the brain. The sclerotic component on CT scan shows low signal intensity on T1W and T2W images and no enhancement. The fibrous component on the other hand is of intermediate signal intensity on both unenhanced sequences and shows avid enhancement following intravenous contrast administration. The soft tissue component seen on CT consistent with secretions, has intermediate T1W and bright T2W signal intensity and shows faint peripheral enhancement. [1.5 Tesla (TR/TE = 437 msec./14 msec.) Slice Thickness = 5.00 mm].

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Axial postcontrast T1 weighted MRI images through the brain. The sclerotic component on CT scan shows low signal intensity on T1W and T2W images and no enhancement. The fibrous component on the other hand is of intermediate signal intensity on both unenhanced sequences and shows avid enhancement following intravenous contrast administration. The soft tissue component seen on CT consistent with secretions, has intermediate T1W and bright T2W signal intensity and shows faint peripheral enhancement. [1.5 Tesla (TR/TE = 500 msec./14 msec.) Slice Thickness = 5.00 mm, 15 cc Gadobenate Dimeglumine, Multihance].

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Coronal T1W spin echo post contrast [1.5 Tesla (TR/TE = 500 msec./14 msec.) Slice Thickness = 6.00 mm, 15 cc, Gadobenate Dimeglumine, Multihance) clearly shows the enhancing fibrous component extending into the left frontoethmoid recess while the sclerotic non enhancing component extends through the left orbital roof and causes mass effect on the superior rectus muscle.

Click 23-year-old male patient with frontal sinus osteoblastoma who presented with headache and blurry vision in left eye. Sagittal T1W spin echo post contrast [1.5 Tesla (TR/TE = 500 msec./14 msec.) Slice Thickness = 6.00 mm, 15 cc, Gadobenate Dimeglumine, Multihance) clearly shows the enhancing fibrous component extending into the left frontoethmoid recess while the sclerotic non enhancing component extends through the left orbital roof and causes mass effect on the superior rectus muscle.