Fig. 2

Case 2. (a) CT image before the first surgery shows a circular-like lesion with a hyperdense supraorbital area in the axial scan of the orbit; (b) CDU before surgery shows an irregular hypoechoic to isoechoic mass with well-defined border behind the eyeball, in which there is acoustic attenuation behind the hyperechoic mass, the optic nerve is compressed to the inferior temporal area, the wall of the eyeball is sunken under pressure, and there is no blood flow in the mass; (c) Histopathology of the specimen of first surgery (\(\:\times\:\)20), yellow\(\:\to\:\), undifferentiated mesenchymal round cells; blue\(\:\to\:\), areas of immature cartilage; \(\:{\Delta\:}\), antler-like vascular gaps; (d and e) MRI of 2 years after first surgery shows an irregular hyperintense lesion of 3 cm × 3 cm in the muscle cone behind the right eyeball, compressing the optic nerve to displace to the nasal side in the axial scan of the orbit on T1-weighted image. The lesion is hyperintense compressing adjacent extraocular muscle to displace on T2-weighted image