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Background: Meckle’s Diverticulum (MD) is a remnant of vitello intestinal duct found in approximately 2-4% of normal population and is usually located on the anti-mesenteric border of terminal ileum. Its variant, the mesenteric type is even rarer, with only a few cases reported in literature.Case: We describe a case of inflamed mesenteric MD that presented with clinical findings of acute appendicitis, but, upon exploration, was diagnosed as inflamed mesenteric MD, that was removed, and the patient recovered without any complications and went home in good condition. We also review all the mesenteric MD cases reported in the literature since 1941.Conclusion: MD is a rare operative finding, but knowledge of its rare variant must be kept in mind as the signs and symptoms closely resemble acute appendicitis.

Sonicates of several Mycobacterium avium complex (MAC) strains isolated from acquired immunodeficiency syndrome (AIDS) patients were characterized in order to study the prominent antigens of these strains. Sonicates of 6-week-old cultures were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting. A major 12 kDa glycoprotein antigen was observed in all the sonicates along with other proteins ranging up to 100 kDa. Western blotting, using the 12 kDa M. leprae ‘specific' murine monoclonal antibody (MAb) MLO6, indicated the presence of a determinant in the 12 kDa antigen (in all the MAC isolates studied) which was immunologically cross-reactive with the 12 kDa antigen of M. leprae . The transparent variant of MAC 101 also demonstrated MLO6 reactivity while the opaque variant did not. Polyclonal antiserum raised against MAC 101 sonicate reacted with all the MAC isolates in immunodiffusion. These observations point to the cross-reactivity between these strains and suggest that they possess a M. leprae ‘specific' determinant on a cross-reacting component which could be involved in virulence.