PMC9635314_01
Images of acute calcific retropharyngeal tendinitis. (A) Sagittal cervical CT. (B) Axial cervical CT. (C) Three-dimensional reconstruction of cervical CT images. All cervical CT scans reveal nodular calcification in front of the C1-C2 vertebra (arrow). (D,F) T2-weighted cervical MRI before treatment. (E,G) T2-weighted cervical MRI after treatment. Before treatment, MRI reveals swelling and prevertebral edema (arrows). After treatment, swelling and edema have disappeared.
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F1
Cervical computed tomography (CT) identified a nodular calcification in front of the second cervical vertebra (Figures 1A-C), and cervical magnetic resonance imaging (MRI) showed a hyperintense signal in the right longus colli muscle on T2-weighted imaging (Figures 1D,F). One month after symptom onset, a cervical spine MRI showed no abnormalities in the longus colli muscle (Figures 1E,G).
PMC9635314_02
Images of crowned dens syndrome. (A) Cervical sagittal CT. (B) Cervical axial CT. (C) Cervical coronal CT. All cervical CT scans reveal calcified lesions around the dens. (D-G) Cervical T1-weighted imaging [(D) axial; (F) sagittal] and T2-weighted imaging [(E) axial; (G) sagittal] before treatment. A cervical MRI reveals no swelling or prevertebral edema.
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CT showed a curvilinear peri-odontoid calcification in the transverse ligament of the atlas on an axial view (Figures 2A-C). Cervical MRI showed normal signal intensity in the longus colli muscle on T2-weighted imaging (Figures 2D-G).