PMC6633968_01
CT of the neck. (a) Axial noncontrast CT at the level of the hyoid bone shows a well-defined, low-density mass expanding the cortex of the hyoid bone with partial bone destruction (arrow). Punctate calcifications are seen within the mass (arrowhead). (b) Axial contrast-enhanced CT at the same level as (a) shows marked enhancement of the solid component (arrow). (c, d) Sagittal at the midline (c) and axial at the infrahyoid level (d) images of contrast-enhanced CT show the mass consists of a solid component and a marginal cystic component (arrows). Left submental lymphadenopathy is also seen (arrowhead).
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Computed tomography (CT) demonstrated a heterogeneous mass at the level of the hyoid bone, 35 x 47 x 38 mm in size, expanding the cortical bone of the hyoid (Figure 1).
MRI of the neck. (a) T2-weighted image at the level of the hyoid bone shows intermediate signal intensity corresponding to the solid component (arrow) and high signal intensity corresponding to the cystic component (arrowhead). (b) Contrast-enhanced fat-suppressed T1-weighted image at the same level as (a) shows marked enhancement of the solid component (arrow). Left submental lymphadenopathy is also seen (arrowhead).
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On magnetic resonance imaging (MRI), the solid component appeared hypointense on T1-weighted images and slightly hypointense on T2-weighted images, with marked enhancement on contrast-enhanced fat-suppressed T1-weighted images (Figure 2).
Histopathological finding of the hyoid bone tumor. (a) Microscopically, the tumor comprises atypical cell forming papillae, corresponding to thyroid papillary carcinoma. (b) Thyroid follicles are also seen around the malignant component [hematoxylin-eosin staining; magnification: 400x (a), 100x (b)].
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Histopathological examination showed papillary adenocarcinoma with calcification (Figure 3).