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RID35065 bullet and bodkin sign

synonym

bullet-on-a-bodkin

definition

Sharp transition between dilated ureter proximally and narrow ureter distally resembles a bullet balancing on a bodkin (a long, slender tool). Caused by encasement of ureter; suggests extension from adjacent tumor, metastases, lymphoma, or retroperitoneal fibrosis.

comment

http://radiographics.rsna.org/cgi/content/full/24/suppl_1/S247