Which of the following is a characteristic of myelomeningocele?

Myelomeningocele is a severe form of spinal bifida, a type of neural tube defect where the spinal cord and surrounding membranes protrude through a defect in the vertebrae. In this condition, the spinal cord remains exposed or is partially covered, which can lead to significant complications, including neurological impairment.

The correct choice accurately reflects a fundamental aspect of myelomeningocele, which is the exposure of the spinal cord. This exposure can result in injury and increased risk of infection, further complicating the infant's clinical management.

The other potential characteristics do not accurately describe myelomeningocele: vertebral development in this condition is abnormal, as the defect in the vertebrae leads to the neurological problems associated. The presence of a solid tumor is not a characteristic of myelomeningocele but could relate to other conditions. Similarly, while displacement of internal organs can occur in various congenital conditions, it is not a defining characteristic of myelomeningocele in itself. Therefore, the exposure of the spinal cord is the most relevant and defining feature of this condition.