Which condition involves a brain within a cranial protrusion extending from the calvaria, most commonly in the occipital region?

Which condition involves a brain within a cranial protrusion extending from the calvaria, most commonly in the occipital region?

• A. Encephalocele
• B. Anencephaly
• C. Hydrocephalus
• D. Microcephaly

Answer: (A)

This describes an encephalocele. It’s a neural tube defect where brain tissue (often with meninges) herniates through a defect in the skull, forming a protrusion at the calvarial surface. The occipital region is the most common site for this herniation, which matches the scenario of a brain within a cranial protrusion extending from the skull. Anencephaly involves failure of the cranial end of the neural tube, resulting in absence of much of the brain and skull rather than a protruding sac through a skull defect. Hydrocephalus is characterized by enlarged ventricles and head due to CSF accumulation, not herniation of brain tissue through the skull. Microcephaly refers to a small head with a normally formed skull and brain, lacking a skull defect or protrusion.

This describes an encephalocele. It’s a neural tube defect where brain tissue (often with meninges) herniates through a defect in the skull, forming a protrusion at the calvarial surface. The occipital region is the most common site for this herniation, which matches the scenario of a brain within a cranial protrusion extending from the skull.

Anencephaly involves failure of the cranial end of the neural tube, resulting in absence of much of the brain and skull rather than a protruding sac through a skull defect. Hydrocephalus is characterized by enlarged ventricles and head due to CSF accumulation, not herniation of brain tissue through the skull. Microcephaly refers to a small head with a normally formed skull and brain, lacking a skull defect or protrusion.