PMC5909087_01
Axial computed tomography scan (a) and magnetic resonance images (b-d) showing a well-demarcated mass in the tip of the left temporal fossa extending into the orbital apex, and accompanying bony erosions in the medial sphenoid ridge (a). The tumor appears isointense on both T1- (b) and T2-weighted (c) sequences, and intensely enhanced on contrast examinations (a and d). The left optic nerve is considerably compressed by the tumour at the orbital apex (b, arrow)
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F1
Cranial computed tomography scans revealed an isodense mass at the tip of the left middle fossa, 2 x 2 cm in maximal dimension, extending into the orbital apex, and accompanying bony erosions in the medial sphenoid ridge [Figure 1a]. T2-weighted sequences and intensely enhanced on contrast examination [Figure 1b-d]. The left optic nerve was considerably compressed by the tumor at the orbital apex [Figure 1b]. The patient underwent a microsurgical tumor resection.
(a and b) Intraoperative photos showing drilling of the medial sphenoid ridge overhanging the tumour (a) and exposure of a dura-based, capsulized tumour (a and b asterisk). TD: Temporal dura
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F2
A frontotemporal craniotomy followed by drilling of the sphenoid ridge revealed a dura-based, capsulized tumor [Figure 2a]. It was elastic, hard, entirely located epidurally, and moderately vascular [Figure 2b].
Microscopic appearance of the tumor comprised by spindle-shaped cells, lacking findings of atypia or necrosis (a). Immunohistochemical stains showing positive staining for bcl2 (b), CD34 (c), CD99 (d), and STAT6 (e), with the MIB-1 index of 10% (f). A: Hematoxylin and eosin stain, x200; b: bcl2; c: CD34; d: CD99; e: STAT6; f: MIB-1, x100
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F3
Microscopically, the tumor comprised spindle-shaped cells, lacking findings of atypia or necrosis [Figure 3a]. Immunohistochemical stains were positive for bcl2, CD34, CD99, and STAT6 [Figure 3b-e], whereas negative for S100 and epithelial membrane antigen. The MIB-1 index was 10% [Figure 3f].