Protrusion or bulging of the forehead associated with hydrocephalus is described as which finding?

• A. Frontal Bossing
• B. Acromelia
• C. Banana Sign
• D. Hydrocephalus

Answer: (A)

Frontal bossing is the protrusion or bulging of the forehead. In infants with hydrocephalus, the ventricles enlarge and intracranial pressure rises, and because the cranial sutures are still open, the skull can expand outward. This expansion often gives a prominent, bulging forehead—the characteristic sign described. This finding helps signal hydrocephalus when seen alongside other signs like ventriculomegaly on imaging. Other terms here point to different ideas—acromelia refers to shortened limbs, the banana sign indicates a cerebellar configuration seen with Chiari II, and hydrocephalus is the overall condition rather than a specific facial feature.