PMC8769420_01
Imaging for present case. (A-D) Plain CT images. (E, F) Plain T1-weighted MRI. (A, B) Coronal CT shows both the larger lesion (*) and the smaller lesion ( ) located on the remodeled frontal base. (C, D, E) Sagittal images reveal the larger lesion located on the fractured part of supraorbital bone and partially involving the intraorbit. (A, B, F) The smaller lesion is sandwiched between remodeled medial frontal base bone. CT: computed tomography, MRI: magnetic resonance imaging.
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F1
The smaller mass was located in the remodeled frontal base (Fig. 1).
Intraoperative photo after left frontal craniotomy. (A) The main lesion (*) shows irregular development from the frontal base dura (arrow). (B) Yellowish, easily suctioned fluid overflows after making an incision in the cyst wall.
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F2
The smaller lesion was also removed in similar fashion (Fig. 2).
Histopathology slides. (A) Hematoxylin-eosin stain shows the cyst wall lined by ciliated columnar epithelium. (B) The lining epithelium is immunopositive for EMA. (C) PAS stain and Alcian blue stain shows scattered goblet cells. (D) Staining for multiple subtypes of mucin show few positive cells. EMA: epithelial membrane antigen, PAS: periodic acid-Schiff.
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F3
These findings were consistent with EC (Fig. 3).