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Figure 1 Photographs of the lesion taken in the first month of life (A), 1 week prior to presentation (B), and in the emergency room (C). US showing dilated vessels with calcifications within the mass (D), filling of the vessels with contrast during embolization (E), and MR imaging (F) at diagnosis. Photographs taken post VAc (G), 2 weeks on Larotrectinib (H), 4 weeks on Larotrectinib (I), and 10 weeks on Larotrectinib (J). MR imaging (K) and photograph (L) taken at 19 weeks.