PMC9699888_01
Computed tomograms on admission ((a), axial, (b) coronal, (c), and (d) three-dimensional imaging) showing thinning of the right parietal bone and cranial deformity.
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F1
Computed tomography (CT) showed that the skull of the right parietal bone was thin but no significant neoplastic lesions are shown in [Figures 1 and 2].
Computed tomograms showing temporal changes ((a) 10 years ago, (b) 5 years ago, and (c) on admission). A gradual thinning of the right parietal bone is observed (white arrows).
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F2
Computed tomography (CT) showed that the skull of the right parietal bone was thin but no significant neoplastic lesions are shown in [Figures 1 and 2]. Retrospective review showed no abnormalities on CT scan done 10 years earlier [Figure 2a] but slight thinning and deformation of the skull were visible on CT scan done 5 years earlier [Figure 2b].
Intraoperative image (a) showing depressed and deformed bone. The outer layer of the excised bone is pigmented and depressed (b), but the inner layer looks intact (c).
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F3
When the skin over the depressed area was turned over, there was an area of 6 x 10 cm in the right parietal bone that was thinned out and was creating a small crater in the calvaria [Figure 3a]. The outer layer of bone was slightly darkened and thinned but the inner layer and dura mater were normal [Figures 3b and c].
Pathological specimens of the normal part (a and c) and thinning part (b and d) are shown. In the low magnification area (b), there is a decrease in bone volume, mainly in the cavernous bone, in the thinned areas. However, no obvious cellular abnormalities exist even at high magnification (d). No lymphatic vessel proliferation, malformation, or lymphocyte proliferation is observed, nor is there any obvious tumor, inflammation, osteolysis, or necrosis.
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F4
No lymphatic vessel proliferation, malformation, or lymphocyte proliferation was observed, nor was there any obvious tumor, inflammation, osteolysis, or necrosis [Figure 4].