Fig. 1

Neck radiological findings of KD initially presenting as retropharyngeal abnormality. a, b Axial and sagittal enhanced neck CT images showing a widening of the retropharyngeal space with a hypodense area without significant ring enhancement (arrow). c, d Axial T2fs MR image and sagittal postGd T1fs MR image showing a retropharyngeal fluid collection with soft tissue oedema without significant ring enhancement (arrow)