Vascular malformationhttps://en.wikipedia.org/wiki/Vascular_malformation
Vascular malformation is a blood vessel or lymph vessel abnormality. The lesion may cause aesthetic problems as they grow. The lesion can continue to become large throughout life.

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      References Congenital arteriovenous malformation (ISSVA classification for vascular anomalies) - Case reports 38435403 
      NIH
      Presenting a Magnetic Resonance Imaging (MRI) finding of a 7 year, 5-month-old male who was brought to our rural hospital by his father with chief complaints of swelling over his right hand since birth. His father narrated that the swelling is increasing significantly and the child has tenderness over swelling. The child underwent an angioembolism 1 month ago and has been brought for re-embolism. Now sclerotherapy has been planned for the patient.