PMC3287138_01
Preoperative imaging by CT and MRI. (a) Computed tomography of his neck. A gourd-shaped distension of bone was present on the right side of his hyoid bone. A multilocular cystic area of low density was observed in the distention. Central ossification was evident in the anterior lesion. (b) Magnetic resonance imaging T1-weighted image with low signal intensity. (c) MRI T2-weighted image high signal intensity. A mosaic pattern was visible in the high signal area.
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F1
A multilocular cystic area of low density was observed inside the distension, and central ossification was evident in the anterior lesion (Figure 1a). The signal intensity was low in T1-weighted images and high in T2-weighted images, with a mosaic pattern being observed in the high signals (Figure 1b, c).
Positron emission tomography-computed tomography. No abnormal accumulation in the hyoid tumor or systemic abnormalities were evident.
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F2
No abnormal accumulation was detected by bone scintigraphy or fluorodeoxyglucose positron emission tomography (FDG-PET) (Figure 2).
Macroscopic and histopathological examination. (a) The extirpated specimen was revealed to be a semi-lobular cartilaginous tumor mass covered by a thin fibrous coat. (b,c) Histopathological findings: (b) hematoxylin-eosin (HE)-stained, x2; (c) HE-stained, x40. The cartilaginous tumor mass is relatively well differentiated, the cell density is somewhat high and many binuclear cells were seen; an open chromatin pattern is evident with intranuclear structures observable in many cells.
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F3
The condition was diagnosed as chondrosarcoma, grade one (Figure 3a-c).