case_images: PMC11807260_01
case_images: Coronal Sinus CT. Coronal section of CT showing soft shadows in the bilateral frontal, maxillary, and ethmoidal sinuses.. CT: computed tomography
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case_images: FIG1
case_images: Axial Head MRI. a) Horizontal MRI section showing a low signal on T1-weighted images, b) high signal on T2-weighted images in the left frontal epidural space with an approximate dimension of 10x8 mm, c) a uniform low-signal area with contrast effect in the surrounding dura mater on T1-weighted images with gadolinium contrast.. A contrast effect was also observed in the frontal bone marrow.
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case_images: FIG2
case_images: A contrast effect was also observed in the frontal bone marrow (Figure 2).
case_images: T1-Weighted Gadolinium Contrast Images. a) Coronal MRI, b) axial MRI. Uniform low-signal areas with contrast effect on T1-weighted gadolinium contrast images were observed under the dura mater along the left interhemispheric fissure.
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case_images: FIG3
case_images: A uniform low-signal area with a contrast effect in the surrounding dura mater was observed on T1-weighted gadolinium contrast along the left interhemispheric fissure (Figure 3).
case_images: Foramen Cecum. a) Axial CT, b) axial MRI T1-weighted gadolinium contrast images.. Arrow: foramen cecum; arrowhead: subdural abscess; inside dotted line: subdural abscess. CT and MRI T1-weighted gadolinium-enhanced contrast images suggested that an abscess had formed in the epidural region of the left frontal lobe just above the frontal sinus. T1-weighted gadolinium contrast images showed a uniform low-signal area with contrast effect in the epidural region of the left frontal lobe just above the frontal sinus.
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case_images: PMC11807260_01_cureus-0017-00000077214-i04.jpg
case_images: FIG4
case_images: Sagittal Head Figures. a) Sagittal CT, b) sagittal MRI. The horizontal section shows a fissure from the right frontal sinus to the abscess area. Soft shadows were observed bilaterally in the maxillary, ethmoid, frontal, and sphenoid sinuses.
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case_images: FIG5
case_images: T1-weighted images, and a high-signal area was seen on T2-weighted images. The CT sagittal section showed a continuous gap from the frontal sinus to the intracranial space, and the T1-weighted gadolinium contrast sagittal section of the MR image showed a continuous contrast effect to the epidural abscess at the same site (Figure 5).
case_images: High-resolution 3D T1-weighted turbo field echo imaging of the brain.. a) Sagittal, b) coronal, c) axial. High-resolution 3D T1-weighted turbo field echo imaging of the brain shows a uniform low-signal area with a contrast effect under the dura along the left interhemispheric fissure. Extensive abscess formation was suspected.
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case_images: FIG6
case_images: However, MRI angiography showed an enlarged subdural abscess cavity on postoperative day 21, and the patient underwent a craniotomy for drainage by neurosurgery (Figure 6).