下列哪种肾脏变异，通常无临床症状

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24734' and id < 2118516 and id<>'2118516' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24734' and id > 2118516 and id<>'2118516' order by id asc limit 5