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The conventional excretory urogram may provide valuable information in the diagnosis of polyarteritis nodosa. A finding of imprints on the ureteral wall or a nodular appearance of the ureter simulating a string of pearls would seem to be pathognomonic for this disorder. Two cases with these manifestations are presented and the differential diagnosis is discussed.

In the diagnosis of multiple myeloma (MM), the radiological skeletal survey (RSS) was proven to be most useful for the detection of bone lesions. Since 1961, a new technique radioisotopic bone scan (RIBS), for the detection of such lesions, using ⁸⁵Sr and ^99mTc, has been shown to be highly sensitive for the detection of skeletal metastases of epithelial tumors. We have studied 30 patients with plasma cell dyscrasia (PCD) by both methods and concluded that RSS is clearly superior to RIBS in PCD. As RIBS detected less than 50% of the lesions demonstrated by RSS there seems to be no indication for a routine RIBS in the initial work-up of patients suspected to have PCD. However, due to the fact that RIBS is useful for the detection of new bone formation it has a certain value in the localization of pathological fractures in MM, mainly in vertebral compression.