Cytological features of well-differentiated tumors of uncertain malignant potential: Indeterminate cytology and WDT-UMP

Endocrine Journal

Zhiyan Liu²  Kennichi Kakudo²  Eisuke Koike¹  Emiko Taniguchi²  Takashi Ozaki²  Keiko Nishigami²  Ichiro Mori² 

[1] Koike Thyroid Hospital, Saga 840-0861, Japan;Department of Human Pathology, Wakayama Medical University, Wakayama 625-8509, Japan

关键词: Thyroid;    Borderline;    Well-differentiated tumor uncertain malignant potential;    Cytology;    Indeterminate;   

DOI  :  10.1507/endocrj.EJ11-0261

学科分类：内分泌与代谢学

来源: Japan Endocrine Society

【 摘 要 】

References(25)Cited-By(3)The purpose of this study was to clarify the cytopathological features of well-differentiated tumors of uncertain malignant potential (WDT-UMP), a possible borderline lesion of thyroid follicular cell tumor.We analysed the cytopathological findings of fine needle aspiration (FNA) smears from 6 cases histologically diagnosed as WDT-UMP.WDT-UMP, benign and malignant lesions were compared retrospectively and morphologically.No (0%) nuclear pseudoinclusions were found in adenomatous goiter (AG), follicular adenoma (FTA) and WDT-UMP.Nuclear pseudoinclusions were increased in number in papillary thyroid carcinoma (PTC) with indeterminate cytology (0.8%) and PTC with malignant cytology (1.2%).The incidence of nuclear grooves increased gradually from AG/FTA (0%), WDT-UMP (4.5%), PTC with indeterminate cytology (6.2%) and PTC with malignant cytology (6.5%).The nuclear area of WDT-UMP, an average of 40.0 μm2, was between that for benign AG/FTA and PTC with malignant cytology.The maximum/minimum axis of WDT-UMP (0.934) lied between that of AG/FTA and PTC.The degree of the nuclear circularity of WDT-UMP was less than that for PTC.WDT-UMP belong to indeterminate category between PTC and follicular adenoma morphologically, and this is one of the major reasons why some of PTC can be found in the indeterminate category.Questionable PTC-N including questionable nucler inclusions (artifact vacuole) may be seen in WDT-UMP, but absolute or definite nuclear inclusions with sharp border are not found in our 6 cases.Therefore this group of thyroid tumors (EnFVPTC and WDT-UMP) may be found in indeterminate category more often, because of intermediate nuclear morphology and incomplete nuclear vacuoles.

【 授权许可】

Unknown