ADC measurements were possible from the clivus of children. Values showed a significant negative correlation with age. Following puberty, there was a reduction in ADC and a left shift in centile histogram values, likely as a result of fat replacement. This was independent of gender. Bone marrow within the clivus behaves like marrow from tubular bones after puberty, and does not retain a cellular morphology expected from red hematopoietic bone marrow.