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Topics Ryles Tube – indications, tests NJ Tube AOD – Commonest 2 causes AXR: BowelBonesCalcification(Stones) The upper limits for the normal diameter 3,6,9 rule (SBO >3cm LBO >6cm Caecum >9cm) LBO & Ileo-Caecal Valve Significance Notes Projection of the abdominal X-ray. Typical projections of an abdominal X-ray include: Anterior-posterior (AP) supine Anterior-posterior (AP) erect BBC approach: