Skip lesions are seen in

in ileocaecal tuberculosis,.Ulcerative--commonest 60%. Circumferential transverse often multiple 'girdle' ulcers - with skip lesions. It i common in old, malnourished people. skip lesions are typical in the case of crohn&;s diseaseskip lesions are also observed in wet gangrene and necrotizing enterocolitis . ref:SRB&;s manual of surgery,ed 3,pg no 513