Abstract:
AIM:It is difficult to differentiate follicular carcinomas (FC) from follicular adenomas (FA) because ultrasonography and cytology provide very similar findings. FC is histopathologically diagnosed to have capsular and/or vascular invasion. In a few patients, tumor protrusions are observed by preoperative ultrasonography as large forms of capsular invasion of follicular carcinomas. The aim of the study was to clarify the predictive value of tumor protrusions on preoperative ultrasonography for follicular carcinomas. MATERIAL AND METHODS:A total of 531 patients (FC: 184 patients, FA: 347 patients) undergoing thyroid surgery were included in this study. A tumor protrusion on ultrasonography was defined as follows: 1) a solid tumor extending beyond a marginal line of capsular zone of the main tumor on B-mode ultrasonography; 2) intensive blood signals observed within the protrusion area on Doppler ultrasonography. The large form of capsular invasion was defined if the protrusion lesion was histopathologically diagnosed to be a capsular invasion of follicular carcinoma. RESULTS:The sensitivity of tumor protrusion was 0.071, specificity 0.994, positive predictive value 0.867, and negative predictive value 0.669 for FC diagnosis. For the large form of capsular invasion in FC the sensitivity of tumor protrusion was 0.813, specificity 0.982, positive predictive value 0.684, and negative predictive value 0.982. CONCLUSIONS:A tumor protrusion with intensive blood signals extending from the main tumor on ultrasonography strongly suggests a large form of capsular invasion of follicular carcinoma.
journal_name
Med Ultrasonjournal_title
Medical ultrasonographyauthors
Kobayashi K,Hirokawa M,Yabuta T,Masuoka H,Fukushima M,Kihara M,Higashiyama T,Ito Y,Miya A,Amino N,Miyauchi Adoi
10.11152/mu.2013.2066.181.koksubject
Has Abstractpub_date
2016-03-01 00:00:00pages
25-9issue
1eissn
1844-4172issn
2066-8643journal_volume
18pub_type
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