FGFR1 and encephalocraniocutaneous lipomatosis: Somatic pathogenic variants in FGFR1—encoding the fibroblast growth factor receptor 1—in the embryo are responsible for another disorder belonging to mosaic RASopathies, namely a congenital overgrowth‐malformation phenotype known as encephalocraniocutaneous lipomatosis characterized by congenital anomalies of skin, scalp, eye, choristomas, and brain lipomas (ECCL, OMIM # 613001).