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[An unusual cause of dysphagia: cervical schwannoma of the prevertebral space. Radioclinical correlations].

The authors report a case of cervical schwannoma with an atypical clinical expression, site and imaging features. The anteromedian lesion lying in the prevertebral and retropharyngeal spaces accounts for its clinical expression in the form of dysphagia. The target appearance on computed tomography and on the T2-weighted MRI sequence was suggestive of a neurofibroma and was due to deposition of fibrin and haemorrhagic exudates in the center of the lesion. The presence of a prevertebral ansa cervicalis in front of the long muscles of the neck, between the longus capitis and longus colli muscles, accounts for the vertical, elongated appearance of this tumour involving the prevertebral space.