"Lorenzo's Oil" is a wonderful film about a terrible disease that attacks children. Susan Sarandon is as fierce as a mother lion as she and her husband (Nick Nolte), as Michaela and Augusto Odone, battle a medical establishment that moves too slowly for the pain and terror they feel. The best thing about the picture is its remorseless refusal to sentimentalize or trivialize: It shows how savage the disease is and how angry Michaela Odone could become. PG-13 rated. *** 1/2 . "The World Goes 'Round," the clever, zippy musical revue at the Morris A. Mechanic Theatre, consists of 31 songs by composer John Kander and lyricist Fred Ebb, whose credits include "Cabaret," "Zorba" and the movie, "New York, New York." What makes the show so thoroughly delightful, however, isn't just the raw material -- though that's an unquestionable delight. It's the spirit and talent of the five-member cast coupled with highly creative choreography and direction. Show times are 2 p.m. and 8 p.m. today and 3 p.m. tomorrow. Tickets are $25-$45. Call (410) 625-1400.