Radiological findings of primary localized amyloidosis of the ureter.
Localized amyloidosis is a rare condition, especially that involving the ureter. Because of its rarity and the difficulty in differentiating this condition from urothelial carcinoma by intravenous urography and computed tomography, nephroureterectomy has often been performed unnecessarily for this disease. The authors encountered two cases of this disease, both of which showed a negative urine cytology, no obvious mass effect, and a hypointensity on T2-weighted imaging. Because these findings are very rare in urothelial carcinoma, ureteroscopy-guided biopsy was performed, which yielded the diagnosis of amyloidosis. The patients were then treated and followed up at our institute. Primary localized amyloidosis of the ureter should be considered when evaluating ureteric lesions visualized as hypointensities on T2-weighted images that do not show an obvious mass effect, which could help in the avoidance of unnecessary surgery.
Department of Diagnostic Radiology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan.
Yuko
Y
Tsujioka
Masahiro
M
Jinzaki
Akihiro
A
Tanimoto
Ken
K
Nakagawa
Hirotaka
H
Akita
Eiji
E
Kikuchi
Shigeo
S
Okuda
Shuji
S
Mikami
Mototsugu
M
Oya
Sachio
S
Kuribayashi
D000368:Aged; D000686:Amyloidosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D001706:Biopsy; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D000075363:Immunoglobulin Light-chain Amyloidosis; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed; D014515:Ureteral Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging
D003287:Contrast Media; C064925:gadodiamide; D019786:Gadolinium DTPA