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Kuba K, Kawasaki T, Enoki Y, Inoue H, Matsumura S, Yamazaki T, Ebihara Y, Nakahira M, Sugasawa M. Follicular adenoma with a papillary architecture originating from an ectopic thyroid gland: a case report. BMC Endocr Disord 2024; 24:16. [PMID: 38287285 PMCID: PMC10826198 DOI: 10.1186/s12902-024-01547-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 01/24/2024] [Indexed: 01/31/2024] Open
Abstract
BACKGROUND Follicular adenomas with papillary architecture are rare tumors of thyroid origin and are composed of completely encapsulated follicular cells with a papillary architecture lacking the nuclear characteristics of papillary carcinoma. Herein, we present a case of follicular adenoma with papillary architecture originating from an ectopic thyroid gland, diagnosed from a mass in the submandibular region. CASE PRESENTATION A 70-year-old woman was referred to our hospital with the chief complaint of a painless left submandibular mass that had been present for one year. The patient underwent left submandibular dissection for therapy and diagnosis. Microscopically, papillary lesions with fibrovascular cores were observed in the interior, and the epithelial cells were cylindrical in shape with eosinophilic cytoplasm, round or oval nuclei, with no pathological features, leading to a diagnosis of papillary carcinoma or follicular carcinoma. The mass was diagnosed as a follicular thyroid adenoma with papillary architecture. This is the first report of a follicular adenoma with a papillary architecture originating from an ectopic thyroid gland. CONCLUSION This experience suggests that follicular adenoma should be included in the differential diagnosis of ectopic thyroid tumors.
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Affiliation(s)
- Kiyomi Kuba
- Department of Head and Neck Surgery, Ageo Central General Hospital, Ageo, Saitama, Japan.
| | - Tomonori Kawasaki
- Department of Diagnostic Pathology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Yuichiro Enoki
- Department of Head and Neck Surgery and Otolaryngology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Hitoshi Inoue
- Department of Head and Neck Surgery and Otolaryngology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Satoko Matsumura
- Department of Head and Neck Surgery and Otolaryngology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Tomoko Yamazaki
- Department of Head and Neck Surgery and Otolaryngology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Yasuhiro Ebihara
- Department of Head and Neck Surgery and Otolaryngology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Mitsuhiko Nakahira
- Department of Head and Neck Surgery and Otolaryngology, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Masashi Sugasawa
- Department of Head and Neck Surgery, Kameda Medical Center, Kamogawa, Chiba, Japan
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Wong KS, Barletta JA. Challenges in Encapsulated Follicular-Patterned Tumors: How Much Is Enough? Evaluation of Nuclear Atypia, Architecture, and Invasion. Surg Pathol Clin 2023; 16:27-44. [PMID: 36739165 DOI: 10.1016/j.path.2022.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Thyroid pathology is notoriously fraught with high interobserver variability, and follicular-patterned tumors are among some of the most challenging to assess accurately and reproducibly. Given that encapsulated or well-circumscribed follicular-patterned tumors often have similar molecular profiles, that is, frequent RAS or RAS-like alterations, the diagnosis usually relies on histopathologic examination alone. Unfortunately, many of the features that are used for diagnosis and prognosis of these tumors have long been controversial and frequently debated topics, both due to their subjectivity and their evolving (or not yet resolved) definitions. In more recent years, the introduction of noninvasive follicular thyroid neoplasm with papillary-like nuclear features has added further complexity to this discussion. In particular, the criteria and significance of nuclear features of papillary thyroid carcinoma, architectural patterns, and invasive growth still pose significant diagnostic challenges and confusion. This review explores some of the challenges in evaluating encapsulated follicular-patterned tumors, focusing on those histologic elements.
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Affiliation(s)
- Kristine S Wong
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Justine A Barletta
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
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Borges FA, Camilo-Júnior DJ, de Almeida EHC, Louzada MJQ, Xavier-Júnior JCC. Score system for cytological evaluation of fine-needle aspiration specimens to predict the diagnosis of papillary thyroid carcinomas. Ann Diagn Pathol 2023; 64:152129. [PMID: 36822052 DOI: 10.1016/j.anndiagpath.2023.152129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023]
Abstract
INTRODUCTION According to the World Health Organization's classification of endocrine tumors, papillary thyroid carcinoma (PTC) accounts for almost 90 % of malignant thyroid neoplasms. This study aimed to create a point system based on cytomorphological criteria for evaluating FNA products from thyroid nodules to predict the risk of papillary thyroid carcinomas. METHODS This was an analytical observational study based on a retrospective analysis of cytological reports and surgical specimens from January 1, 2016, to December 31, 2021. Cytological slides were analyzed using the following ten variables: Nuclear Grooves; Intranuclear Pseudoinclusion; Cellularity; Colloid (Quantity); Clarified Chromatin; Overlapping nuclei; Irregular Nuclear Membrane; Multinucleated Giant Cells; Psamoma bodies; and Papillae. We categorized these variables quantitatively from zero to three points as follows: zero (absent), one (mild), two (moderate), and three (intense). RESULTS Cytologies of 254 (4.9 %) cases were analyzed. The cut-off point was defined in this study as 6 ± 1 points. For the prediction of cases in benign, values < 5 points, malignant, values > 7 points and indeterminate, 5-7 points. Among the benign, there were 64 (69.5 %) cases <5 points, 17 (18.4 %) from 5 to 7 points and 11 (11.9 %) >7 points. Among the malignant ones, there were 12 (8.6 %) cases <5 points, 19 (13.6 %) from 5 to 7 points and 108 (77.6) >7 points. CONCLUSION In this context, through the quantitative analysis of the ten suggested cytological variables, scored from 0 to 3, a final score > 7 is suspicious for malignancy, while a score < 5 is related to benign lesions.
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Affiliation(s)
- Felipe Abrantkoski Borges
- School of Medicine, Centro Universitário Católico Unisalesiano Auxilium, Araçatuba, São Paulo, Brazil
| | | | | | | | - José Cândido Caldeira Xavier-Júnior
- School of Medicine, Centro Universitário Católico Unisalesiano Auxilium, Araçatuba, São Paulo, Brazil; Instituto de Patologia de Araçatuba (IPAT), Araçatuba, São Paulo, Brazil.
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The American Association of Endocrine Surgeons Guidelines for the Definitive Surgical Management of Thyroid Disease in Adults. Ann Surg 2020; 271:e21-e93. [PMID: 32079830 DOI: 10.1097/sla.0000000000003580] [Citation(s) in RCA: 236] [Impact Index Per Article: 59.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To develop evidence-based recommendations for safe, effective, and appropriate thyroidectomy. BACKGROUND Surgical management of thyroid disease has evolved considerably over several decades leading to variability in rendered care. Over 100,000 thyroid operations are performed annually in the US. METHODS The medical literature from 1/1/1985 to 11/9/2018 was reviewed by a panel of 19 experts in thyroid disorders representing multiple disciplines. The authors used the best available evidence to construct surgical management recommendations. Levels of evidence were determined using the American College of Physicians grading system, and management recommendations were discussed to consensus. Members of the American Association of Endocrine Surgeons reviewed and commented on preliminary drafts of the content. RESULTS These clinical guidelines analyze the indications for thyroidectomy as well as its definitions, technique, morbidity, and outcomes. Specific topics include Pathogenesis and Epidemiology, Initial Evaluation, Imaging, Fine Needle Aspiration Biopsy Diagnosis, Molecular Testing, Indications, Extent and Outcomes of Surgery, Preoperative Care, Initial Thyroidectomy, Perioperative Tissue Diagnosis, Nodal Dissection, Concurrent Parathyroidectomy, Hyperthyroid Conditions, Goiter, Adjuncts and Approaches to Thyroidectomy, Laryngology, Familial Thyroid Cancer, Postoperative Care and Complications, Cancer Management, and Reoperation. CONCLUSIONS Evidence-based guidelines were created to assist clinicians in the optimal surgical management of thyroid disease.
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Zhu Y, Song Y, Xu G, Fan Z, Ren W. Causes of misdiagnoses by thyroid fine-needle aspiration cytology (FNAC): our experience and a systematic review. Diagn Pathol 2020; 15:1. [PMID: 31900180 PMCID: PMC6942345 DOI: 10.1186/s13000-019-0924-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 12/27/2019] [Indexed: 12/16/2022] Open
Abstract
Objective FNA is a simple, safe, cost-effective and accurate diagnostic tool for the initial screening of patients with thyroid nodules. The aims of this study were to determine the diagnostic utility of FNAC performed in our institution, assess the cytomorphologic features that contribute to diagnostic errors and propose improvement measures. Methods A total of 2781 FNACs were included in the study, and 1122 cases were compared with their histological diagnoses. We retrospectively reexamined our discordant (both false-negative and false-positive) cases and performed a systematic review of previous studies on causes of misdiagnoses. Results When DC V and DC VI were both considered cytologic-positive, the sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and diagnostic accuracy were 98.3, 30.9, 94.9, 58.3 and 93.5%, respectively. If DC VI was considered cytologic-positive, the sensitivity, specificity, PPV, NPV and diagnostic accuracy of FNAC were 98.0, 84.0, 99.4, 58.3, and 97.5% respectively. The main cause of false-negative diagnoses was sampling error (13/15, 86.7%), while interpretation error led to the majority of the false-positive diagnoses (38/47, 80.9%). Overlapping cytological features in adenomatous hyperplasia, thyroiditis and cystic lesions were the major factors contributing to interpretation errors, while the size and number of nodules may have led to false-negative diagnoses because of heterogeneity and unsampled areas. Conclusions The sensitivity and PPV of thyroid FNAC in our institution were higher than those in the published data, while the specificity and NPV were lower. Regarding the FNA category DC V, a frozen section analysis during diagnostic lobectomy is necessary. Multiple passes should be performed in various parts of a large nodule or from different nodules to reduce the risk of false-negative findings. Cytopathologists should strengthen their criteria for the identification of adenomatous hyperplasia, thyroiditis and cystic lesions to avoid false-positive diagnoses. NIFTP has little effect on diagnostic accuracy and the distribution of diagnostic errors.
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Affiliation(s)
- Yanli Zhu
- Key laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Pathology, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Yuntao Song
- Key laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Head and Neck Surgery, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Guohui Xu
- Key laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Head and Neck Surgery, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Zhihui Fan
- Key laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Ultrasound, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Wenhao Ren
- Key laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Pathology, Peking University Cancer Hospital and Institute, Beijing, 100142, China.
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Abstract
Immunohistochemical markers of thyroid tumors can be divided into two major categories: those related to the cell types and those related to the type of pathology. The most important markers in the first category are thyroglobulin and TTF-1 for follicular cells, and calcitonin, CEA, and chromogranin for C cells. Markers in the second category are primarily directed at papillary carcinoma and include cytokeratin 19, high-molecular weight keratin (identifiable with antibody 34βE12), S-100 protein, HBME-1, galectin 3, and p27kip1. At the practical level, cell type-related markers are much more useful than disease-related markers. Markers said to be of prognostic value in medullary carcinomas are calcitonin, bcl-2, and N-myc.
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Affiliation(s)
- Juan Rosai
- Department of Pathology, National Cancer Institute, Milan, Italy.
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Deshmukh SD, Patil PA, Khandeparker SGS, Naik C. Oncocytic adenoma of thyroid with papillary architecture: A diagnostic dilemma. South Asian J Cancer 2015; 4:50-1. [PMID: 25839028 PMCID: PMC4382792 DOI: 10.4103/2278-330x.149958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Sanjay D Deshmukh
- Department of Pathology, Smt. Kashibai Navale Medical College and Hospital, Narhe, Pune, Maharashtra, India
| | - Pallavi A Patil
- Department of Pathology, Smt. Kashibai Navale Medical College and Hospital, Narhe, Pune, Maharashtra, India
| | - Siddhi G S Khandeparker
- Department of Pathology, Smt. Kashibai Navale Medical College and Hospital, Narhe, Pune, Maharashtra, India
| | - Chetana Naik
- Department of Otorhinolaryngology, Smt. Kashibai Navale Medical College and Hospital, Narhe, Pune, Maharashtra, India
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Vigliar E, Varone V, Pettinato G, Bellevicine C, Troncone G. How should a follicular adenoma with papillary architecture be classified on thyroid FNA? Case report with histological correlation. Cytopathology 2014; 26:256-8. [PMID: 25073478 DOI: 10.1111/cyt.12172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2014] [Indexed: 11/28/2022]
Affiliation(s)
- E Vigliar
- Department of Public Health, University of Naples 'Federico II', Naples, Italy
| | - V Varone
- Department of Advanced Biomedical Science, University of Naples 'Federico II', Naples, Italy
| | - G Pettinato
- Department of Advanced Biomedical Science, University of Naples 'Federico II', Naples, Italy
| | - C Bellevicine
- Department of Public Health, University of Naples 'Federico II', Naples, Italy
| | - G Troncone
- Department of Public Health, University of Naples 'Federico II', Naples, Italy
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9
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Pusztaszeri MP, Krane JF, Cibas ES, Daniels G, Faquin WC. FNAB of benign thyroid nodules with papillary hyperplasia: A cytological and histological evaluation. Cancer Cytopathol 2014; 122:666-77. [DOI: 10.1002/cncy.21441] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2014] [Revised: 05/01/2014] [Accepted: 05/02/2014] [Indexed: 01/21/2023]
Affiliation(s)
| | - Jeffrey F. Krane
- Harvard Medical School; Boston Massachusetts
- Department of Pathology; Brigham and Women's Hospital; Boston Massachusetts
| | - Edmund S. Cibas
- Harvard Medical School; Boston Massachusetts
- Department of Pathology; Brigham and Women's Hospital; Boston Massachusetts
| | - Gilbert Daniels
- Harvard Medical School; Boston Massachusetts
- Thyroid Unit and Department of Medicine; Massachusetts General Hospital; Boston Massachusetts
| | - William C. Faquin
- Harvard Medical School; Boston Massachusetts
- Department of Pathology; Massachusetts General Hospital; Boston Massachusetts
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10
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Arora N, Scognamiglio T, Zhu B, Fahey TJ. Do benign thyroid nodules have malignant potential? An evidence-based review. World J Surg 2008; 32:1237-46. [PMID: 18327528 DOI: 10.1007/s00268-008-9484-1] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Benign thyroid tumors account for most nodular thyroid disease. Determination of whether a thyroid nodule is benign or malignant is a major clinical dilemma and underlies the decision to proceed to surgery in many patients. Although the accuracy of thyroid nodule fine-needle aspiration (FNA) has reduced the need for surgery over the years, questions regarding how to follow FNA-designated benign nodules remain unresolved. This is true at least in part because of uncertainty over whether some benign nodules harbor malignant potential. METHODS An evidence-based review of recent clinical, pathologic, and molecular data is presented. A summary of data and observations from our own experience is also provided. RESULTS Review of our recent 10-year experience indicates that 2% of thyroid malignancies arise within a preexisting benign thyroid nodule. In addition, both cytologic and molecular tumor markers, including Gal-3, CITED1, HBME-1, Ras, RET/PTC, and PAX8/PPAR gamma, have been identified in some histopathologically classified benign nodules. Gene expression profiling suggests that follicular adenomas and Hürthle cell adenomas have similarities to both benign and malignant tumors, suggesting that some of these tumors are premalignant. In addition, 10% of surgically excised follicular tumors are encapsulated follicular lesions with nuclear atypia, which have been termed "well-differentiated tumors of uncertain malignant potential." The data available suggest that these tumors could be precursors to carcinoma. CONCLUSION Some benign thyroid nodules have malignant potential. Further molecular testing of these tumors can shed light on the pathogenesis of early malignant transformation.
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Affiliation(s)
- Nimmi Arora
- Department of Surgery, New York Presbyterian Hospital-Cornell University, 1300 York Avenue, New York, NY 10065, USA
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Faquin WC. The thyroid gland: recurring problems in histologic and cytologic evaluation. Arch Pathol Lab Med 2008; 132:622-32. [PMID: 18384214 DOI: 10.5858/2008-132-622-ttgrpi] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2007] [Indexed: 11/06/2022]
Abstract
Nodules of the thyroid gland are frequently encountered, occurring in up to 7% of the population, and although most of these nodules are benign, carcinomas of the thyroid gland are the most common malignancy of the endocrine system. Although the different types of thyroid carcinoma are few, a wide variety of recurring problems exists in both their histologic and cytologic evaluation. Here, I will review a selected group of problematic areas, including unusual histologic variants of follicular adenoma, criteria for diagnosing minimally invasive follicular carcinoma, the use of fine-needle aspiration as a screening test for follicular neoplasia, challenging variants of papillary carcinoma, and features of poorly differentiated carcinoma.
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Affiliation(s)
- William C Faquin
- Department of Pathology, WRN 219, Massachusetts General Hospital, 55 Fruit St, Boston, MA 02114, USA.
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12
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Mai KT, Elmontaser G, Perkins DG, Thomas J, Stinson WA. Benign Hürthle cell adenoma with papillary architecture: a benign lesion mimicking oncocytic papillary carcinoma. Int J Surg Pathol 2005; 13:37-41. [PMID: 15735853 DOI: 10.1177/106689690501300105] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We studied the significance of encapsulated Hürthle cell thyroid nodules with papillary structures lacking the nuclear features of papillary thyroid carcinoma (PTC); 19 cases fulfilling these criteria were encountered The patients' ages ranged from 22 to 40 years (32+/-6), and the F:M ratio was 3:1 The tumors measured from 0.5-5 cm (2+/-1.1). The diameter of the tumor cell nuclei ranged from 5.6 to 7.2 microns. Many nodules had nuclei displaying a fine chromatin pattern somewhat resembling those of PTC, but these were present in <20% of the tumor cells. Immunohistochemically, there was reactivity for MIB-1 in the papillary structures, negativity to focally weak reactivity for HBME and galectin-3, and negativity to moderate diffuse reactivity for CK19. Clinical follow-up from 1 to 19 years revealed no evidence of metastases in any of the cases. It is unlikely that the papillary structures in the study cases represent degenerative changes in view of the proliferative activity we have demonstrated in them. In view of (1) the encapsulation and the uniformity of the constituent cells, (2) the negative or weak immunoreactivity for galectin-3 and HBME and negative to moderate immunoreactivity for CK19, and (3) the absence or paucity of nuclear criteria for the diagnosis of PTC and the absence of lymph node metastasis in all study cases, we believe that these lesions represent the papillary variant of oncocytic follicular adenoma (Hürthle cell adenoma). Recognition of this entity is important to avoid an overdiagnosis of oncocytic PTC.
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Affiliation(s)
- Kien T Mai
- Anatomical Pathology, Department of Laboratory Medicine, The Ottawa Hospital, University of Ottawa, Ottawa, Ontario, Canada
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Mai KT, Bokhary R, Yazdi HM, Thomas J. Hybrid thyroid carcinoma with a coarse chromatin pattern and nuclear features of papillary thyroid carcinoma. Pathol Res Pract 2002; 198:253-60. [PMID: 12049333 DOI: 10.1078/0344-0338-00251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Hybrid follicular carcinoma (FC) and papillary thyroid carcinoma (PTC) have not been previously well described. Consecutive cases of 29 FC, 12 Hurthle cell carcinomas (HC), 247 PTC and 13 Hurthle cell PTC (HPTC) were reviewed with special attention to the coarse (CC) and fine chromatin patterns (FIC), as well as to the presence of nuclear grooves, pseudoinclusions or optically clear appearance. Limited nuclear features of PTC (LNF-PTC) are defined as areas of tumor with FIC in addition to some other nuclear features, but insufficient for the diagnosis of PTC. Tumors with nuclei showing an admixture of CC and PTC or LNFPTC were submitted for immunostaining for cytokeratin 19, HBME and Ret/PTC. FC and HC contained areas of LNFPTC in 25 tumors and focal PTC in 3 tumors. None of these cases was associated with lymph node metastasis. Areas with CC were found in 54 PTC and 3 HPTC. The rates of vascular invasion and distant metastasis tended to be higher for PTC with areas of coarse chromatin pattern than for PTC without such areas; however, the difference was not statistically significant. Immunoreactivity for cytokeratin 19 and HBME was moderate to strong for PTC and focal areas of PTC or LNFPTC in FC without Hurthle cell changes. Ret/PTC immunostaining was positive in areas of LNFPTC or focal PTC in three FC. Focal PTC or areas of LNFPTC are frequently seen in FC. Likewise, areas of CC are often present in PTC. The presence of these focal areas does not appear to change the clinical behavior of the tumor and therefore does not warrant a change of nomenclature.
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Affiliation(s)
- Kien T Mai
- Department of Laboratory Medicine, The Ottawa Hospital, Ontario, Canada.
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Arif S, Blanes A, Diaz-Cano SJ. Hashimoto's thyroiditis shares features with early papillary thyroid carcinoma. Histopathology 2002; 41:357-62. [PMID: 12383219 DOI: 10.1046/j.1365-2559.2002.01467.x] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Neoplastic transformation is a multistep process that results in a continuous spectrum from the normal (physiological) state to a fully established neoplasm. The gold standard for diagnosis of papillary thyroid carcinoma is conventional histology, the essential element being the characteristic nuclear features, regardless of whether papillary structures are present or not. However, other criteria are being used increasingly in the diagnosis of neoplasms, including immunohistochemical staining and molecular profile. The RET/PTC gene rearrangement is highly specific for papillary thyroid carcinoma and is associated with the characteristic nuclear features seen in papillary thyroid carcinoma. There is an overlap in the morphological features, immunohistochemical staining pattern, and most importantly, molecular profile between papillary thyroid carcinoma and Hashimoto's thyroiditis. Although considered a 'benign' condition, Hashimoto's thyroiditis almost always harbours a genetic rearrangement that is strongly associated with and is highly specific for papillary thyroid carcinoma. Submicroscopic foci of papillary thyroid carcinoma must be present in Hashimoto's thyroiditis, although the clinical behaviour is still benign. Further studies are required to predict which foci will progress to papillary thyroid carcinoma.
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Affiliation(s)
- S Arif
- Department of Histopathology, Barts and The London NHS Trust, The Royal London Hospital, Whitechapel, London, UK
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15
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Mai KT, Khanna P, Yazdi HM, Perkins DG, Veinot JP, Thomas J, Lamba M, Nair BD. Differentiated thyroid carcinomas with vascular invasion: a comparative study of follicular, Hürthle cell and papillary thyroid carcinoma. Pathology 2002; 34:239-44. [PMID: 12109784 DOI: 10.1080/00313020220131291] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
AIM Non-medullary thyroid carcinomas arise from follicular cells. The purpose of this study is to correlate clinical and pathological properties of these tumours with the rate of distant metastasis from a series of thyroid tumours excised at one institution. METHODS A total of 311 non-medullary thyroid tumours were identified and divided into: 29 follicular carcinoma (FC), 12 Hürthle cell carcinoma (HC), 13 Hürthle cell papillary thyroid carcinoma (HPTC) with vascular invasion (VI), 32 papillary thyroid carcinoma (PTC) with VI and 225 PTC without VI. The mean follow-up was 6.5 years with a range of 1-17 years. The tumours were histologically subdivided into minimal or wide invasion for FC and HC and focal or extensive invasion for PTC and HPTC, and stratified according to status of VI. RESULTS The rate of distant metastasis was similar for FC, malignant Hürthle cell tumours and PTC with VI, and increased with extent of invasion. VI was seen in 12% of all PTC and 0% of HPTC in this study. PTC without VI were associated with a much lower potential of distant metastasis, were smaller in size and occurred in patients of younger age than PTC with VI. In addition, there was a tendency for increased potential for distant metastases with increased tumour size and patient age for all groups of tumours in the study. Patient age and tumour size appeared to play a smaller role than that of VI in predicting distant metastasis. CONCLUSIONS Our study suggests that the rate of distant metastasis relates to VI, patient age and tumour size, regardless of Hürthle cell, FC or PTC differentiation. PTC of large size, and in patients older than 45 years, have a high propensity for vascular invasion.
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Affiliation(s)
- Kein T Mai
- Department of Laboratory Medicine, The Ottawa Hospital, Ontario, Canada.
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Stephenson TJ. Papillary carcinoma of the thyroid: a tumour still with no benign neoplastic counterpart. Histopathology 2001; 39:536-8. [PMID: 11737313 DOI: 10.1046/j.1365-2559.2001.01169.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- T J Stephenson
- Department of Histopathology, Sheffield Teaching Hospitals, Sheffield, UK.
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