The combination of bicoronal craniosynostosis, broad thumbs and great
toes, and partial variable soft tissue syndactyly of the hands and fee
t (i.e., Pfeiffer syndrome) classically followed a benign clinical cou
rse. A review of the clinical features of those Pfeiffer syndrome pati
ents presenting to our unit confirm another subgroup in whom the crani
ofacial and associated manifestations are more extreme, with a signifi
cant risk of early demise. The early aggressive surgical management of
craniostenosis, hydrocephalus, exorbitism, faciostenosis, and upper a
irway obstruction has provided the potential for prolonged useful surv
ival in these cases.