PMC4508748_01
Lateral skull radiograph revealing an osteolytic lesion in the parietal bone (arrows). L: left, R: right.
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F1
Skull radiography and bone window computed tomography (CT) scans revealed an osteolytic lesion on the right parietal bone (Figs. 1, 2).
Bone window computed tomography (CT) scan depicting erosion on the inner table of the skull.
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F2
Skull radiography and bone window computed tomography (CT) scans revealed an osteolytic lesion on the right parietal bone (Figs. 1, 2).
A: T1-weighted magnetic resonance (MR) images showing iso- to hypointense lesion. B: T2-weighted MR images showing a hyperintense lesion. C: T1-weighted MR images with gadolinium showing enhancement of the margin of the lesion.
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F3
T1-weighted imaging (Fig. 3A) and hyperintense in T2-weighted imaging (Fig. 3B). T1-weighted MR imaging with gadolinium enhancement showed prominent enhancement of the margin of the lesion (Fig. 3C).
Intraoperative findings. A: Erosion of the outer tables is observed and watery fluid was expelled. B: The inner table of the skull is disrupted, and both sides of the outer table are eroded. Tumor mass is not observed. C: Dura mater has a visible defect, whereas the arachnoid mater is preserved.
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F4
After reflecting the scalp, a slight erosion was noticed in the outer tables of the right parietal bone (Fig. 4A), and fluid leakage was expelled. The inner table of the skull was disrupted prominently (Fig. 4B). A small defect was found in the underlying dura mater, whereas the arachnoid mater was preserved (Fig. 4C).
A: Photomicrograph showing meningioma cells in the inner part of the bone defect. Hematoxylin and eosin stain (original magnification, 40x). B: Variably sized cystic spaces and vacuolated cytoplasm. Hematoxylin and eosin stain (original magnification, 200x).
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F5
Histological examination of the specimen revealed microcystic meningioma in the inner part of the bone lesion and defective dura mater (Fig. 5A). The tumor had a myxoid appearance, was loosely textured and hypocellular, with widespread formation of microcysts (Fig. 5B).