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Photographic documentation of dinutuximab beta extravasation in the soft tissue of the left upper arm in a 3-year-old patient on the day of diagnosis (a) and on day 6 (b): a palpable lesion on day 6 (black arrow) was further investigated by sonography, which demonstrated an anechoic non-vascularized liquid encapsulation of 2 mL volume surrounded by panniculitis (c).
