PMC9899488_01
Axial CT (soft-tissue window) demonstrating hypodense right frontal lobe mass with hyperdense rim (arrows).
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FIG1
There was partial opacification of the right frontal sinus with erosion through the anterior wall of the sinus (Figures 1-2).
Axial CT without contrast demonstrating erosion of the posterior table of the right frontal sinus (arrow) and right frontal sinus opacification (arrowhead).
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FIG2
There was partial opacification of the right frontal sinus with erosion through the anterior wall of the sinus (Figures 1-2).
T1-weighted post-gadolinium demonstrating right frontal lobe mass, hypointense center with a thin enhancing rim.
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FIG3
MRI confirmed the findings of the CT scan (Figures 3-4).
T2-weighted images demonstrating hyperintense mass. There is moderate vasogenic edema in the right frontal lobe and severe mass effect with right-to-left midline shift.
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FIG4
MRI confirmed the findings of the CT scan (Figures 3-4).
Intraoperative-focused ultrasound of right frontal lobe demonstrating frontal lobe abscess (arrows) from frontal sinus disease, measuring 5 cm in diameter.
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FIG5
Intraoperative focused ultrasound of the right frontal lobe demonstrated a frontal lobe abscess of 5 cm in diameter (Figure 5).
Axial CT demonstrating postsurgical changes after right frontal craniectomy.
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FIG6
The residual gas in the abscess cavity extended along the operative tract into subcutaneous soft tissues (Figure 6).
PMC9899488_02
Axial CT without contrast, demonstrating erosion of walls of the frontal sinus.
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FIG7
CT scan revealed bony erosion of the anterior and posterior walls of the right frontal sinus (Figure 7).
Axial T1-weighted post-gadolinium demonstrating hypointense fluid collection with an enhancement of walls centered at the frontal sinus and extending subcutaneously.
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FIG8
MRI showed a subdural empyema measuring approximately 9 mm in diameter and a 6-7 mm midline shift to the left and right lateral ventricle compression due to mass effect (Figures 8-10).
Axial T2-weighted image demonstrating subdural collection with layering effect likely due to settled inflammatory debris or hemorrhage.
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FIG9
MRI showed a subdural empyema measuring approximately 9 mm in diameter and a 6-7 mm midline shift to the left and right lateral ventricle compression due to mass effect (Figures 8-10).
Sagittal T1-weighted post-gadolinium images demonstrating destruction in the interim anterior and posterior walls with intracranial extension as well as extension into the extracranial soft tissues of the frontal region. Fluid collection within the subdural space is also noted (subdural empyema).
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FIG10
MRI showed a subdural empyema measuring approximately 9 mm in diameter and a 6-7 mm midline shift to the left and right lateral ventricle compression due to mass effect (Figures 8-10).
Postoperative (Day 1) image demonstrates the gas within the abscess cavity extending along the operative tract into the subcutaneous soft tissues.
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FIG11
One-day postoperative CT demonstrated pneumocephalus (Figure 11).
A 16-month postsurgical axial CT demonstrating progressive ossification of the left frontal sinus.
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FIG12
Also, there was no focal mass, midline shift, abnormal enhancement, or acute intracranial hemorrhage (Figure 12).