Arteriography is of importance and practical value in the differential diagnosis of borderline lesions of bone. It will reveal and clearly determine the malignant or benign character of the lesion, and it thus becomes of primary consideration in the early diagnosis of bone malignancy.

The advantages of arteriography as a method for the early diagnosis bone malignancy are dependent primarily on how early in the disease this form of investigation is undertaken. Arteriography will afford a definite diagnosis of a bone neoplasm in an accessible region when the contrast obtained by the opaque substance used is clear and the technique employed is so exact that the slightest deviation from normal in the arterial circulation is detectable.

The author has found, from both clinical and experimental work, that the use of ascending arteriography broadens the field for the employlnent of this method of investigation, since it may be employed when the use of descending arteriography would be either impractical or impossible.

This procedure deserves further trial, especially in large institutions devoted to the study of cancer, where its real value may be ascertained. All contributions leading to a better understanding of this method and the minimizing of the errors in technique should be encouraged, so as to make possible a complete evaluation of its present and future possibilities as a diagnostic aid.