Ogilvie syndrome (not Oglivie) is a condition where there is a sudden blockage of the colon despite there being no mechanical reason for the obstruction. This means that there is no mass or narrowing causing the obstruction. In fact, the colon is actually widened (dilatation) abnormally. Ogilvie syndrome is also known as acute colonic pseudo-obstruction. It is appears to arise as a consequence of dysfunction of the nerves controlling motility. It should not be confused with a similar condition which is known as Hirschsprung disease where these nerves are absent from birth. In Ogilvie syndrome some of the nerves are dysfunctional but the normal number of nerves are present.