Ann G... There were, at the time I had my pallidotomy 3 years ago, actually FOUR types of PD - A,B,C, and D. Then there are the sub-types: A-B, A-C, B-A, etc., which refer to the PD patient as having symptoms in more than one type, with the dominant symptom listed first. Sorry... I don't recall just what those types indicate, 'cause I haven't thought about this topic since the surgery. Barb Mallut [log in to unmask] ---------- From: Parkinson's Information Exchange on behalf of MR JOSEPH GIBBONS Sent: Saturday, November 08, 1997 4:28 AM To: Multiple recipients of list PARKINSN Subject: Type A & B PD >From time to time there are references to Types A & B PD on the List. Type B seems to be a PD condition without tremor that progresses more rapidly? Are there really two types of PD? Can anyone clarify this mystery? Thanks in advance. Ann Gibbons