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 dangling because its placement gives it nothing to modify. In many cases, the dangling modifier appears at the beginning of a sentence, although it can also come at the end. Sometimes the error occurs because the sentence fails to specify anything to which the modifier can refer.