Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA 94143-0628, USA.
Pediatr Radiol. 2011 May;41(5):620-6; quiz 681-2. doi: 10.1007/s00247-011-2019-1. Epub 2011 Mar 16.
Ultrasound (US) is used to identify causes of neonatal cholestasis. We describe a potential sonographic pitfall, the "pseudo gallbladder," in biliary atresia (BA).
To describe the Pseudo Gallbladder sign (PsGB sign).
Sonograms/clinical records of 20 confirmed BA infants and 20 non-BA cases were reviewed retrospectively. For the BA group, preoperative sonography and surgical and pathological findings were examined. For the non-BA group, sonographic features and pathological findings were examined. The PsGB sign is defined as a fluid-filled structure, located in the expected region of the gallbladder, measuring ≤ 15 mm in length but without a well-defined or normal-appearing gallbladder wall.
A recognizable gallbladder and normal gallbladder wall were present in all non-BA infants. However, none of the BA infants had a sonographically normal gallbladder. Seventy-three percent of BA patients had a PsGB, and in 27% no gallbladder or gallbladder-like structure was detected.
A gallbladder-like structure in BA is common and can be misinterpreted as a normal gallbladder, delaying diagnosis and therapy. Recognition of this imaging pitfall, described here as the pseudo gallbladder sign, will help avoid this error.
超声（US）用于确定新生儿胆汁淤积的原因。我们描述了胆道闭锁（BA）中潜在的超声陷阱，即“假性胆囊”。
描述假性胆囊征（PsGB 征）。
回顾性分析 20 例确诊 BA 婴儿和 20 例非 BA 病例的超声检查/临床记录。对于 BA 组，检查术前超声检查和手术及病理结果。对于非 BA 组，检查超声特征和病理结果。PsGB 征定义为位于胆囊预期区域的充满液体的结构，长度≤15mm，但无明确或正常的胆囊壁。
所有非 BA 婴儿均有可识别的胆囊和正常的胆囊壁。然而，没有 BA 婴儿的胆囊在超声检查下是正常的。73%的 BA 患者有 PsGB，27%的患者未检测到胆囊或胆囊样结构。
BA 中的胆囊样结构很常见，可能被误诊为正常胆囊，从而延误诊断和治疗。认识到这里描述的这种影像学陷阱，即假性胆囊征，将有助于避免这种错误。
