Answer:
Sagittal synostosis - resulting in a narrow, elongated cranial vault and reduced bitemporal dimension (a "boatlike" or "toaster head"). The incidence of increased ICP is 13% with single suture involvement. Treatment requires cranial vault remodeling with removal of the affected suture and performance of frontal, parietal, and occipital "barrel-stave" osteotomies. Typically sporadic.