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Dolichocephaly refers to a condition characterized by a relatively long head. This is determined by a cephalic index of less than 75, meaning the head is longer than it is wide. A more extreme form is hyperdolichocephaly, where the head is very long and narrow, with a cephalic index below 70. These terms describe head shape and are related to anatomy, specifically the skull. Craniosynostosis, the premature fusion of skull bones, can also lead to abnormally shaped heads, such as long, high, and narrow skulls (scaphocephaly).123

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