GH1 and isolated hemihyperplasia: Seven studies22 31 32 37 38 41 43 included children with other pathology associated with IH, including hydrocephalus22 37 38 (n=16), papilloedema of unspecified aetiology32 (n=5), acute lymphoblastic leukaemia41 (n=1), aseptic meningitis43 (n=1), growth hormone replacement therapy31 (n=1), head injury43 (n=1), recurrent nephrotic syndrome31 (n=1), rickets41 (n=1), sagittal sinus thrombosis43 (n=3) and sigmoid sinus thrombosis43 (n=1).