Hydromyelia is a medical condition that occurs when there is an abnormal accumulation of cerebrospinal fluid within the spinal cord's central canal. There are many other synonyms for this term that are used by medical professionals. One commonly used synonym is syringomyelia, which refers to a specific form of hydromyelia that occurs when the spinal cord cavity forms a syrinx or a tube-like indentation. Another synonym is cavity of spinal cord, which refers to the empty space within the spinal cord where the cerebrospinal fluid accumulates. Other less-often used synonyms for hydromyelia include spinal cord cyst, spinal cord hydrocele, and spinal cord dilation. Overall, understanding these synonyms can help individuals better understand and communicate about this medical condition.