Hydromyelia is a medical condition that involves widening of the intraspinal cavity or is a marked dilatation of the central spinal canal. The central canal of the spinal column is the main area of affectation that results to increased pressure due to fluid accumulation.
dangling participle - a participle (usually at the beginning of a sentence) apparently modifying a word other than the word intended: e.g., `flying across the country' in `flying across the country the Rockies came into view'.
A dangling modifier is a modifier that has nothing to modify. Remember, modifiers describe a word or make its meaning more specific. A dangling modifier is an error caused by failing to use the word that the modifier is meant to be describing. Here is an example of a dangling modifier (shaded): Having read your letter, my cat will stay indoors until the ducklings fly off.