PMC9983725_01
Large mass to left side of neck.
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On examination a large mass was visible to the left side of her neck measuring approximately 5 cm x 5 cm (Figure 1).
POCUS of neck mass level VB.
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POCUS of neck mass.
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RADUS of neck mass.
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This is shown in Figure 4. 
MRI soft tissue neck/thorax coronal plane.
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Nature of lesion - indeterminate - although sinister possibilities (e.g. sarcoma) should be considered. (See Figures 5 and 6 showing MRI images of neck lesion).
MRI soft tissue neck transverse plane.
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Nature of lesion - indeterminate - although sinister possibilities (e.g. sarcoma) should be considered. (See Figures 5 and 6 showing MRI images of neck lesion).
Example of POCUS algorithm for paediatric neck mass.
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Thickened or irregular walls, loss of the normal echogenic hilum or internal features such as increased echogenicity (suggesting calcification, other infiltration or internal cystic change) should prompt the user to consider a potentially sinister cause such as the algorithm in Figure 7 demonstrates.