New nomenclature of renal calices and morphological classification of pelvicaliceal system：preliminary report

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  • 新しい腎杯の命名法と腎盂腎杯の形態学的分類の試み
  • アタラシイジンハイ ノ メイメイホウ ト ジンウジンハイ ノ ケイタイガクテキ ブンルイ ノ ココロミ

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Abstract

The aim of this study is to propose the new nomenclature of renal calices and morphological classification of pelvicaliceal system. We investigated 237 kidneys by three-dimensional images of CT-Urography. We systematically named each renal calyx into five level：top（T）, upper（U）, middle（M）, lower（L）, and bottom（B）. The upper, middle and lower calices are usually found in pairs：anterior（A）and posterior（P）. When a compound calyx is counted as one calyx, the total number of renal calices is most often eight. We classified the form of the pelvicaliceal system into type I（68.4%）and type II（31.6%）by the difference in the branch patterns. The type I is subclassified into three types：type Ia（56.5%）which is the standard type, type Ib（4.6%）where the renal pelvis is large in a convex shape, and type Ic（7.2%）where the renal pelvis is small in a concave shape.

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