Pfeiffer-type cardiocranial syndrome is a rare condition reported prev
iously in three patients, two of whom were sibs. All three patients sh
ared features that included growth and developmental retardation, sagi
ttal synostosis, hypertelorism, low set ears, micrognathia with mandib
ular ankylosis, congenital heart defects, and genital anomalies. The p
urposes of this report are to present a fourth patient with features o
f the Pfeiffer-type cardiocranial syndrome, to expand the clinical phe
notype of this condition, and to present evidence that supports the co
ncept that this phenotype represents a distinct nosological entity.