Abstract
1) A newly discovered case of the double superior venae cavae was described, in which the left superior vana cava descended symmetrically to the right one and connected with the coronary sinus.
2) An anastomosis between the right and left superior v enae cavae was not found. The present case belonged to Type 1 (RL) by the modified Yamadori's classification.
3) The complete pair e d azygos veins did not anatomose with each other. Both vessels communicated with the supreme intercostal vein emptying to the vertebral vein.
4) The right subclavian vein consisted of two channels, between which the M. subclavius was held. The bigger anterior channel was the main stream of the subclavian proper.
5) The left external iliac vein made a ring-formation through which the left iliolumbar artery passed.
Grateful acknowledgementi s made to P rof. Y. Ohta and Dr. T. Tokioka, lecturer, for their constant interest and guidance in this work.
