PMC9887545_01
Axial (A) and coronal (B) T2-weighted images, and sagittal T1-weighted images before (C) and after (D) contrast administration. The lesion has a heterogeneous signal on spontaneous T1 (C) and T2 images (A and B) - it is slightly hyperintense on T2 and markedly hyperintense on T1 peripherally, and iso/hypointense on T2 and hypointense on T1 centrally. On postcontrast images, there is a diffuse enhancement (D). Axial bone window CT image showing an ill-defined ground-glass density lesion centered in the clivus, with loss of normal bone cortication; The lesion has a maximum antero-posterior extension of 35mm, but there is no significant mass effect. (1-E)
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FIG1
MRI imaging showed a cystic sphenoidal extradural lesion, isointense on T1-weighted images (WI) with peripheral gadolinium enhancement and hyperintense on T2 WI (Figure 1).
Cystic lesion surrounded by bone tissue and lined by respiratory epithelium with no atypia, consistent with the diagnosis. Respiratory-type epithelium lining cyst (*), surrounded by mature osseous bone (#). A: 40x, B: 100x
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FIG2
Histopathological examination was also conducted on part of the cyst wall (Figure 2).
PMC9887545_02
Axial (A) and sagittal (B) bone window CT images of the same patient, after endoscopic surgical approach. There was partial removal of the lesion.
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FIG3
Headaches disappeared after one week, and the patient didn't develop neurologic symptoms or post-operative complications from the endoscopic surgery (Figure 3).