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'.
Dangling participles should not be confused with clauses in absolute constructions, which are considered grammatical. Because the participle phrase in an absolute construction is not semantically attached to any single element in the sentence, it is easily confused with a dangling participle. The difference is that a participle phrase is intended to modify a particular noun or pronoun, but is instead erroneously attached to a different noun, whereas as an absolute clause is not intended to modify any noun at all.