BACKGROUND: Few studies have addressed the various types of @entity1901 apparent in @entity1 treated for ureteral stones, especially in those with impacted stones. Macroscopic and microscopic analyses of @entity1901 associated with impacted stones were therefore undertaken. METHODS: From May 1994 to October 1996, 36 @entity1 with ureteral stones, 21 of whom showed stone impaction, were treated with transurethral ureterolithotripsy. After ureteroscopic examination, biopsied specimens were obtained from six @entity1 with impacted stones and were examined microscopically by conventional @entity1710 and @entity1711 staining. RESULTS: Ureteroscopy revealed two types of @entity3137 in the @entity1 with impacted stones: Type 1 lesions were defined as @entity4 or @entity66 and occurred in 18 @entity1 , whereas type 2 lesions had a villous appearance and were present in three @entity1 . Microscopically, type 1 lesions appeared as @entity4 without specific findings, whereas type 2 lesions appeared as columnar mesenchymal tissue coated with several layers of transitional epithelium. With regard to factors that might contribute to lesion formation, duration of stone presence was significantly greater for @entity1 with impacted stones than for those with-non-impacted stones. However, no differences in such parameters were apparent between @entity1 with type 1 lesions and those with type 2 lesions. CONCLUSIONS: Two types of @entity1901 associated with impacted stones were confirmed microscopically. The duration of stone presence is a potential contributing factor in the development of @entity1901 , but factors that determine the type of @entity1901 remain unclear.

Characterization of XXXX associated with impacted stones.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity1901 :: ('MESH:D014515', 'Disease') :: ['ureteral lesions', 'ureteral lesion'] @entity66 :: ('MESH:D004194', 'Disease') :: ['cystic hemispheric lesions'] @entity4 :: ('MESH:D004487', 'Disease') :: ['edematous', 'submucosal edema'] @entity1711 :: ('MESH:D004801', 'Chemical') :: ['eosin'] @entity1710 :: ('MESH:D006416', 'Chemical') :: ['hematoxylin'] @entity3137 :: ('MESH:D009059', 'Disease') :: ['mucosal lesions']
@entity1901 :: (MESH:D014515,Disease) :: ['ureteral lesions']
