increased head circumference


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macrocephaly

An abnormally large head and/or brain; in children, macrocephaly is defined as an occipitofrontal circumference of > 3 SD ≥ the mean.

DiffDx—non-hydrocephalic causes of macrocephaly
Benign familial form (siblings also have large heads), achondroplasia, Banayan syndrome, cerebral gigantism (with macrosomia or Sotos syndrome), cutis marmorata telangiectatica congenita, fragile X syndrome, Klippel-Trenauny-Weber syndrome, mucopolysaccharidosis, neurofibromatosis, Weaver syndrome.

increased head circumference

Macrocephaly, see there.
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