Lypoma with blood veins. For the baby?

Hi , my 8 months daughter has been diagnosed with Lipoma on her back. We consulted a Pediatric surgeon and in the Ultrasound report, it was shown that the swell also had blood veins in it too which makes surgery not easy. I had below questions here Will it be okay to perform surgery or does it need any other way to take care of blood vessels? We came to know that, incase of blood vessels, the lump will be removed by injection, so what will be safe in this case? Surgeon said, to further examine the lump, do we need to get the MRI, is it safe to do MRI on such young girl? If MRI is required, the baby has to be sedated it seems, so it will make 2 Anesthesia, 1 st scan and the other during operation. Is it safe for the baby?