Welcome to Classifications and Online Calculators in Radiology

This site was build along with the Atlas of Radiology Images to support your knowledge in radiology.

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that are used in radiology and related fields with free access.

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    Criteria of midgut malrotation (volvulus, malrotation) detected on fluoroscopy in children (Katz)

    Katz et al. described nine findings for distinguishing normal and abnormal duodenal / jejunal positioning on upper gastrointestinal studies to detect subtle abnormalities indicative of midgut malrotation.

    • One abnormality represents normal variation
    • Two abnormalities represent indeterminate finding
    • Three and more abnormalities found together indicate malrotation

    Pylorus:

    1) pylorus to left of the midline

    Duodenojejunal flexure:

    2) below level of L1-L2 intervertebral disk space in child under 18 years
    3) >1.3 corrected distance below apex of the duodenal bulb
    4) to right of the left pedicle

    Segment between inferior and duodenojejunal flexures:

    5) Intervening obstruction
    6) Connecting line not longest side of triangle
    7) Connecting line <2.6 (corrected distance)

    Jejunum:

    8) Corkscrewing or zigzagging beyond duodenojejunal flexure
    9) To right of the spine
     

    References:

    1. Katz ME, Siegel MJ, Shackelford GD, McAlister WH. The position and mobility of the duodenum in children. AJR Am J Roentgenol 1987; 148: 947–951. http://www.ajronline.org/doi/pdf/10.2214/ajr.148.5.947

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