Toyonaga H, Hayashi T, Ueki H, Chikugo K, Ishii T, Nasuno H, Kin T, Takahashi K, Takada M, Ambo Y, Shinohara T, Yamazaki H, Katanuma A. An intact boundary between the tumor and inner hypoechoic layer discriminates T1 lesions among sessile elevated gallbladder cancers.
J Hepatobiliary Pancreat Sci 2021;
28:1121-1129. [PMID:
33826798 DOI:
10.1002/jhbp.961]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 03/06/2021] [Accepted: 03/21/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND
The depth of invasion determines the surgical method for treating gallbladder cancer (GBC). However, the preoperative correct diagnosis of invasion depth, especially discrimination of T1 lesions among sessile elevated GBCs, is difficult. We investigated the utility of preoperative endoscopic ultrasound (EUS) findings for diagnosing the invasion depth.
METHODS
We studied a sessile elevated GBC specimen diagnosed as a T1 lesion before developing our study protocol. EUS evidenced an intact boundary between the tumor and the inner hypoechoic layer (the intact boundary sign). To evaluate the potential of using this sign to diagnose T1 GBC as a primary outcome indicator, we retrospectively analyzed patients who underwent surgical resection of sessile elevated GBCs between April 2009 and March 2020.
RESULTS
Of the 26 surgically resected sessile elevated GBC specimens, 20 were included and six were excluded due to difficulty in evaluating the overall tumor or layer structure. The Kappa coefficient for interobserver agreement regarding the intact boundary sign was 0.733. The sensitivity and specificity of the sign for diagnosing T1 lesions were 0.857 and 1.000, respectively.
CONCLUSION
This new EUS finding could guide the accurate diagnosis of T1 lesions in patients with sessile elevated GBC.
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