Ureter Obstructed by Lymphoma Detected on Bone Scan and SPECT/CT: Cutoff sign

Alev Çinar, Abdulbaki Erkovan, Ibrahim Kılıccalan, Aslı Ayan
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Abstract

Obstructive uropathy occurs due to common causes such as kidney stones, vesicoureteral reflux, posterior urethral valve and urothelial tumors. In addition, there are rare causes such as solid tumors, retroperitoneal fibrosis, primary lymphomas (Non-Hodgkin lymphomas etc.). A 20-year old male with lower back pain underwent a bone scan for differential diagnosis of back pain. The bone scan findings were normal, except for the presence of unilateral renal stasis accompanied by a short segment ureteral stasis. Due to the abrupt termination of the ureteral activity, namely the “cutoff sign”, a subsequent SPECT/CT imaging was focused for differential diagnosis of ureteral stasis. Non-diagnostic CT sections revealed a para-aortic soft tissue mass compressing the ureter. This case underlines the added value of SPECT/CT imaging in subtle scintigraphic findings. The abrupt termination of stasis in the ureter may warrant the application of SPECT/CT in cases with no previous history of urinary tract pathology. SPECT / CT may provide additional benefits of clarifying the etiology.
骨扫描和 SPECT/CT 检测到淋巴瘤阻塞输尿管:临界信号
阻塞性尿路病发生的常见原因包括肾结石、膀胱输尿管反流、后尿道瓣膜和尿路上皮肿瘤。此外,还有一些罕见病因,如实体瘤、腹膜后纤维化、原发性淋巴瘤(非霍奇金淋巴瘤等)。一名 20 岁的男性因下腰痛接受了骨扫描,以鉴别诊断腰痛。骨扫描结果正常,只是出现了单侧肾淤血并伴有短段输尿管淤血。由于输尿管活动突然终止,即 "截止征",随后的SPECT/CT成像被聚焦于输尿管瘀血的鉴别诊断。非诊断性 CT 切片显示主动脉旁软组织肿块压迫输尿管。该病例强调了 SPECT/CT 成像在细微闪烁成像发现方面的附加价值。对于既往无泌尿道病史的病例,输尿管瘀血的突然终止可能需要应用 SPECT/CT 检查。SPECT/CT在明确病因方面可能会带来额外的益处。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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