Focal necrosis of the ureter was observed in our patient 7 days after CT-guided chemical sympathectomy. The injection of phenol was apparently rendered remote from the ureter and still caused ureteric necrosis. Ureteric injury may thus result following chemical sympathectomy, not from direct puncture of the ureter, but from unpredictable individual diffusion pathways.
Trigaux, J.-P., Van Beers, B., & De Coene, B. (1992). Focal necrosis of the ureter following CT-guided chemical sympathectomy. Cardiovascular and Interventional Radiology, 15(3), 180-182. https://doi.org/10.1007/BF02735584 (Original work published 1992)