CSF1R and dysosteosclerosis: His CSF1R defect was compound heterozygous in a patient with “brain abnormalities, neurodegeneration, and dysosteosclerosis” (BANDDOS: OMIM # 618476).(22) The father, who was heterozygous, had mild cortical hyperostosis and normal cranial tomography, yet short‐term memory loss from age 70 years, and parenchymal calcification were detected in the 76‐year‐old paternal grandfather, who was also heterozygous.(22)