Syringobulbia is a medical condition in which syrinxes, or fluid-filled cavities, affect the brainstem. This defect normally results from congenital abnormality, trauma or tumor growth.
It mostly occurs within the lower brainstem as a slit-like gap. This may affect one or more cranial nerves, resulting in various kinds of facial palsies. Sensory and motor nerve pathways may be affected by interruption or compression of nerves. This disorder is associated with syringomyelia, a syrinx limited to the spinal cord.