Fluorographic examination under roentgenographic control of 400,000 persons revealed rib doubling to be the rarest anomaly--3 cases (approximately, one case per 133,000 examined) and semi-doubling ribs--2 cases (1:200,000); in literature only one case of the right third rib doubling (P. V. Yashunin, 1936) is described. Our cases of rib doubling are: the third, left; the fourth, left and the only case of neighbouring ribs doubling--the first and second, left; semi-doubling: the third, left (demonstrated) and the fifth, left.
在X线控制下对40万人进行荧光摄影检查发现，肋骨双份是最罕见的异常情况——有3例（约每13.3万人检查出1例），半双份肋骨有2例（1:20万）；文献中仅描述了1例右侧第三肋骨双份的情况（P. V. 亚舒宁，1936年）。我们发现的肋骨双份病例有：左侧第三肋骨；左侧第四肋骨以及相邻肋骨双份的唯一病例——左侧第一和第二肋骨；半双份肋骨有：左侧第三肋骨（已证实）和左侧第五肋骨。
