The article presents a clinical example of the removal of myxoma in a 14-month-old child with half resection of the mandible, disarticulation and one-stage replacement of the defect with a «Carbopol» endoprosthesis. The period of postoperative follow-up was 6.5 years, during which there were no signs of relapse. 2 years after the operation, complete coverage of the endoprosthesis with bone regenerate was determined, the configuration of which corresponded to the healthy branch of the mandible. The remodeling of the condylar and coronoid processes by this regenerate was noted, as well as the formation of the tooth germ 3.8 above the endoprosthesis.
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