A rare form of malformation where the cerebellumThis word means the “little brain” and refers to a large part of the brain that sits in lowermost part of the skull, at the back of the head, immediately above the top of the spine. This part of the skull is known as the posterior fossa. and brain stemThis is the most primitive part of the brain, connecting the rest of the brain to the body, via the spinal cord. In addition to feeding signals to and from such “higher centres”, the brain stem contains a number of important control centres, regulating vital functions such as breathing and blood pressure. are herniated into a meningocœleThis is a sac-like expansion of the membranes that enclose the brain and spinal cord. It is an abnormality of normal development that is usually evident at birth and surgical correction is usually carried out. It is associated with abnormal development of the bones of the spinal canal, referred to as spina bifida. If there are neural elements inside the meningocœle then the term myelomeningocœle is used., at the back of the neck.
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