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Ryu H, Wu HG, Lee KE, Chung EJ, Ahn SH, Park YJ, Choi HS. Effect of postoperative radiotherapy for patients with differentiated thyroid cancer. Clin Endocrinol (Oxf) 2022; 98:803-812. [PMID: 36535908 DOI: 10.1111/cen.14865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 11/14/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022]
Abstract
OBJECTIVE We evaluated the efficacy and safety of postoperative radiotherapy (PORT) for differentiated thyroid cancer (DTC) with high risk features. MATERIALS AND METHODS This retrospective study analyzed 187 patients treated for DTC from 1985 to 2019. DTC referred to nonanaplastic thyroid cancer originating from follicular cells. PORT was defined as the administration of external beam radiation to the thyroid and regional lymph nodes following surgery for initially diagnosed DTC. The patients were included in the analysis if they received PORT or exhibited any of the following features: (a) pT4 or pN1b according to the 8th American Joint Committee on Cancer, (b) poorly differentiated thyroid cancer (PDTC), or (c) unfavourable variants such as anaplastic foci and etc. After 1:1 propensity matching, a total of 108 patients were analyzed according to PORT receipt. The median follow-up duration of the matched group was 10.4 years. RESULTS After matching, most of the variables became balanced, but the PORT group still had more PDTC and DTC with anaplastic foci. Radioactive iodine (RAI) was less frequently administered in the PORT group. PORT yielded a significantly higher 5-year locoregional recurrence free survival (LRFS) than the No PORT group (5-year LRFS 86.1% vs. 72.7%, p = 0.022), but the 10-year cancer specific survival (CSS) was similar between them (97.8% vs. 85.9%, p = 0.122). The multivariable analysis indicated that PORT was a favourable prognostic factor (Hazard ratio 0.3, 95% Confidence interval 0.1-0.8, p = 0.02) for LRFS, but not for CSS. Among 133 patients without PORT for initial disease, 39 of them received salvage surgery followed by salvage PORT. No severe toxicity after PORT was reported. CONCLUSION PORT reduced locoregional recurrence in DTC patients without severe toxicity. PORT can be an effective and safe treatment to improve locoregional control in DTC with high risk features. However, further study is warranted to identify those who can benefit from PORT.
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Affiliation(s)
- Hyejo Ryu
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
| | - Hong-Gyun Wu
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
- Medical Research Center, Institute of Radiation Medicine, Seoul National University, Seoul, Korea
| | - Kyu Eun Lee
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Eun-Jae Chung
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Korea
| | - Soon-Hyun Ahn
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Korea
| | - Young Joo Park
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Hoon Sung Choi
- Department of Internal Medicine, Chungang University Gwangmyeong Hospital, Gyeong-gi, Korea
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Zhang X, Chen L, Zhang H, Nong L, Wang F. Ultrasonic Characterization of Primary Squamous Cell Carcinoma of the Thyroid. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2022; 41:2317-2322. [PMID: 34927280 DOI: 10.1002/jum.15918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/29/2021] [Accepted: 12/05/2021] [Indexed: 06/14/2023]
Abstract
OBJECTIVES To identify the ultrasonographic characteristics of primary squamous cell carcinoma of the thyroid (PSCCT), and to assess the value of the 2015 American Thyroid Association (ATA) guideline and 2017 American College of Radiology (ACR) Thyroid Imaging, Reporting and Data System (TI-RADS) in the evaluation of this disease. METHODS Eight patients with 9 PSCCTs over a 20-year study period were enrolled. Ultrasonic characteristics including nodule echogenicity, composition, shape, margin, calcification, size, vascularity, and cervical lymphadenopathy were reviewed. All nodules were then evaluated by 2017 ACR TI-RADS and 2015 ATA guidelines. RESULTS The average size of PSCCTs was 3.87 ± 1.41 cm. All PSCCTs were hypoechoic or very hypoechoic, solid nodules with intranodular vascularity. The average resistive index (RI) was 0.84 ± 0.18. Near half of PSCCTs (44.4%) demonstrated extrathyroidal extension. Taller-than-wide signs and cervical lymphadenopathy were observed in 33.3% of PSCCTs, and microcalcification was observed in 11.1% of them. All PSCCTs were classified as high suspicion patterns by 2015 ATA and recommended for fine-needle aspiration (FNA). Six PSCCTs (66.7%) were classified as grade 5 by 2017 ACR TI-RADS, while the remaining were grade 4. 88.9% of PSCCTs were recommended for FNA based on 2017 ACR TI-RADS. CONCLUSION PSCCT has certain ultrasonic features, including relatively large, hypoechoic, or very hypoechoic solid nodules with intranodular vascularity and extrathyroidal extension. Both 2015 ATA and 2017 ACR TI-RADS could identify PSCCT as suspicious for malignancy.
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Affiliation(s)
- Xiumei Zhang
- Department of Ultrasound, Peking University First Hospital, Beijing, China
| | - Lei Chen
- Department of Ultrasound, Peking University First Hospital, Beijing, China
| | - Hong Zhang
- Department of Pathology, Peking University First Hospital, Beijing, China
| | - Lin Nong
- Department of Pathology, Peking University First Hospital, Beijing, China
| | - Fumin Wang
- Department of Ultrasound, Peking University First Hospital, Beijing, China
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Wan Sohaimi WF, Lee YF, Mat Nawi N, Mohd Rohani MF, Sapiai NA. A Case Rarity: Papillary Thyroid Carcinoma with Squamous Metaplasia Complicated with Chronic Discharging Ulcers. Indian J Surg Oncol 2019; 10:676-678. [PMID: 31857764 DOI: 10.1007/s13193-019-00977-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 08/07/2019] [Indexed: 10/26/2022] Open
Abstract
We report a unique case of differentiated thyroid carcinoma (DTC) with squamous metaplasia complicated with chronic discharging ulcer. A 76-year-old gentleman was referred to us after defaulted treatment 1 year post-total thyroidectomy. He presented to us with long-standing chronic, non-healing, ulcerative and discharging wound at the anterior neck at previous total thyroidectomy scar. The primary tumour was histologically diagnosed as papillary malignant cells with extensive squamous metaplasia. Squamous metaplasia is a rare finding in thyroid carcinoma that carried a poorer prognostic factor.
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Affiliation(s)
- Wan Fatihah Wan Sohaimi
- 1Department of Nuclear Medicine, Radiotherapy and Oncology, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan Malaysia.,2Hospital Universiti Sains Malaysia (Hosp USM), 16150 Kubang Kerian, Kelantan Malaysia
| | - Y F Lee
- Department of Nuclear Medicine, Sabah Women and Children Hospital, Likas, 88450 Kota Kinabalu, Sabah Malaysia
| | - Norazlina Mat Nawi
- 1Department of Nuclear Medicine, Radiotherapy and Oncology, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan Malaysia.,2Hospital Universiti Sains Malaysia (Hosp USM), 16150 Kubang Kerian, Kelantan Malaysia
| | - Mohd Fazrin Mohd Rohani
- 1Department of Nuclear Medicine, Radiotherapy and Oncology, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan Malaysia
| | - Nur Asma Sapiai
- 2Hospital Universiti Sains Malaysia (Hosp USM), 16150 Kubang Kerian, Kelantan Malaysia.,4Department of Radiology, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan Malaysia
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Kallel S, Kallel R, Ayadi S, Ghorbel A. Primary squamous cell carcinoma of the thyroid associated with papillary thyroid carcinoma and Hashimoto's thyroiditis. Eur Ann Otorhinolaryngol Head Neck Dis 2018; 135:291-293. [PMID: 29914738 DOI: 10.1016/j.anorl.2018.05.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
INTRODUCTION We report the first case of squamous cell carcinoma (SCC) of the thyroid gland coexisting with papillary thyroid carcinoma (PTC) and Hashimoto's thyroiditis and discuss various theories concerning the histogenesis of SCC of the thyroid gland and the optimal treatment strategy. CASE REPORT A 54-year-old woman presented with an anterior neck mass measuring 4cm on clinical examination. Imaging showed a suspicious thyroid nodule invading the trachea. Total thyroidectomy with bilateral central lymph node resection was performed. Histological examination revealed tall cell variant of papillary thyroid carcinoma associated with SCC of the right lobe of the thyroid and Hashimoto's thyroiditis. Immunohistochemistry of the SCC showed positive staining for p53 and Ki67 and negative staining for thyroglobulin. The patient underwent adjuvant radioactive iodine therapy and radiotherapy. With postoperative follow-up of 24 months, the patient was in good health. DISCUSSION In conclusion, the most probable origin of SCC in this case was malignant transformation from Hashimoto's thyroiditis following a phase of metaplasia. This immunohistological profile is associated with a better prognosis. Optimal treatment consists of extensive surgical resection of tumour tissuefollowed by radiotherapy.
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Affiliation(s)
- S Kallel
- Department of otolaryngology-Head and Neck Surgery, Habib Bourguiba University Hospital, Sfax 3029, Tunisia.
| | - R Kallel
- Department of pathology, Habib Bourguiba University Hospital, Sfax 3029, Tunisia
| | - S Ayadi
- Department of otolaryngology-Head and Neck Surgery, Habib Bourguiba University Hospital, Sfax 3029, Tunisia
| | - A Ghorbel
- Department of otolaryngology-Head and Neck Surgery, Habib Bourguiba University Hospital, Sfax 3029, Tunisia
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Beninato T, Kluijfhout WP, Drake FT, Khanafshar E, Gosnell JE, Shen WT, Duh QY, Suh I. Squamous differentiation in papillary thyroid carcinoma: a rare feature of aggressive disease. J Surg Res 2018; 223:39-45. [DOI: 10.1016/j.jss.2017.10.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 09/15/2017] [Accepted: 10/12/2017] [Indexed: 10/18/2022]
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Struller F, Senne M, Falch C, Kirschniak A, Konigsrainer A, Muller S. Primary squamous cell carcinoma of the thyroid: Case report and systematic review of the literature. Int J Surg Case Rep 2017. [PMID: 28633125 PMCID: PMC5479948 DOI: 10.1016/j.ijscr.2017.06.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Primary squamous cell cancer (PSCC) of thyroid is a rare malignancy with poor prognosis. It is mandatory to exclude secondary involvement of the thyroid by panendoscopy, CT-scan and immunohistochemical analysis. As treatment surgery, radiation and rarely chemotherapy is employed. METHODS A systematic review of the literature was conducted searching medline and embase database using the medical subject headings "primary squamous cell carcinoma of thyroid" and "primary squamous cell cancer of thyroid", for articles published until April 2016 (n=1733). Of interest were the used treatment modalities and survival outcomes. RESULTS A total of 35 publications reporting on 50 cases including ours were finally analyzed. A curative treatment approach was described in 24 patients (48%). Additional radiotherapy, chemotherapy or radiochemotherapy was applied in 17, 7 and 7 patients respectively. Median overall survival was 6 months [range 0-48] for 47 patients. Disease free survival was only achieved in 8 patients with disease limited to the thyroid gland, complete surgical resection and additional radiotherapy or radiochemotherapy [reported median 20 months; range 12-48]. CONCLUSION Reported disease free survival of PSCC of the thyroid was only achieved in patients with complete surgical resection in combination with adjuvant radio- and/or chemotherapy. However long term survival has not been reported in the literature yet.
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Affiliation(s)
- Florian Struller
- Clinic for Visceral, General and Transplant Surgery, Tuebingen University Hospital, Germany
| | - Moritz Senne
- Clinic for Visceral, General and Transplant Surgery, Tuebingen University Hospital, Germany
| | - Claudius Falch
- Clinic for Visceral, General and Transplant Surgery, Tuebingen University Hospital, Germany
| | - Andreas Kirschniak
- Clinic for Visceral, General and Transplant Surgery, Tuebingen University Hospital, Germany
| | - Alfred Konigsrainer
- Clinic for Visceral, General and Transplant Surgery, Tuebingen University Hospital, Germany
| | - Sven Muller
- Clinic for Visceral, General and Transplant Surgery, Tuebingen University Hospital, Germany.
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Hirokawa M, Sugitani I, Kakudo K, Sakamoto A, Higashiyama T, Sugino K, Toda K, Ogasawara S, Yoshimoto S, Hasegawa Y, Imai T, Onoda N, Orita Y, Kammori M, Fujimori K, Yamada H. Histopathological analysis of anaplastic thyroid carcinoma cases with long-term survival: A report from the Anaplastic Thyroid Carcinoma Research Consortium of Japan. Endocr J 2016; 63:441-7. [PMID: 26842589 DOI: 10.1507/endocrj.ej15-0705] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The aim of this study was to clarify the histopathological features of anaplastic thyroid carcinoma in patients who achieved long-term survival. We reviewed 88 anaplastic thyroid carcinoma cases in which the patient survived less than 3 months (short-term survival), and 68 anaplastic thyroid carcinoma cases in which the patient survived more than one year (long-term survival) from the database of the Anaplastic Thyroid Carcinoma Research Consortium of Japan. We examined these cases both histologically and immunohistochemically. Six (6.8%) short-term survival cases and 27 (39.7%) long-term survival cases were considered not to be anaplastic thyroid carcinoma after central review. Of these, 12 were revised to papillary carcinoma with squamous cell carcinoma. In cases without chemotherapy, long-term survival was significantly more common if there was a pre-existing tumor, epithelial growth, or lymphocytic infiltration, and short-term survival was more common if neutrophilic infiltration was present. In cases with chemotherapy, long-term survival was significantly more common if epithelial growth or a squamous cell carcinoma component was present, whereas short-term survival was more common in cases with rhabdoid cells. Immunohistochemical results were not related to survival. Some long-term survival cases showed histological findings other than those typically associated with anaplastic thyroid carcinoma. The presence of a pre-existing tumor, epithelial growth, a squamous cell carcinoma component, no neutrophilic infiltration and lymphocytic infiltration may therefore be favorable prognostic factors in anaplastic thyroid carcinoma.
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Ryan N, Walkden G, Lazic D, Tierney P. Collision tumors of the thyroid: A case report and review of the literature. Head Neck 2015; 37:E125-9. [PMID: 25491252 DOI: 10.1002/hed.23936] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2014] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Collision tumors of the thyroid are a rare pathology that present a diagnostic and treatment challenge. In this report, we present an interesting case and a review of the current literature as to inform management. METHODS AND RESULTS An 88-year-old woman presented with acute airway compromise and vocal cord paralysis. CT identified a thyroid mass and widespread metastasis. Histopathology identified the lesion as a collision tumor consisting of a squamous cell carcinoma (SCC) and papillary thyroid carcinoma. The patient was managed with surgery and palliative radiotherapy. However, she died from complications of a lower respiratory tract infection. We also present a review of the literature with 33 cases reviewed. CONCLUSION Management of collision tumors is complex because of the duality of the pathology. They should be managed in a multidisciplinary team setting and treatment should be patient specific. Generally, the most aggressive neoplasm should guide treatment. We recommend surgical management with adjunct therapy.
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Affiliation(s)
- Neil Ryan
- United Bristol Healthcare NHS Trust, ENT Bristol, United Kingdom
| | - Graham Walkden
- North Bristol NHS Trust, Surgery Bristol, United Kingdom
| | - Darko Lazic
- Great Western Hospital, Histopathology Swindon, United Kingdom
| | - Paul Tierney
- United Bristol Healthcare NHS Trust, ENT Bristol, United Kingdom
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Primary squamous cell carcinoma of the thyroid diagnosed as anaplastic carcinoma: failure in fine-needle aspiration cytology? Case Rep Pathol 2014; 2014:301780. [PMID: 25295208 PMCID: PMC4175754 DOI: 10.1155/2014/301780] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 08/20/2014] [Indexed: 12/16/2022] Open
Abstract
A case of primary squamous-cell carcinoma (SCC) of the thyroid which had been initially diagnosed as an anaplastic carcinoma (ATC) is described: female, 73 years old, with a fast-growing cervical nodule on the left side and hoarseness for 3 months. Ultrasonography showed a 4.5 cm solid nodule. FNA was compatible with poorly differentiated carcinoma with immunoreactivity for AE1/AE3, EMA. Thyroidectomy was performed. Histopathological examination showed a nonencapsulated tumor. Immunohistochemistry disclosed positivity for AE1/AE3, p53,p63, and Ki67. The diagnosis was ATC. A second opinion reported tumor consisting of squamous cells, with intense inflammatory infiltrate both in tumor and in the adjacent thyroid, with final diagnosis of SCC, associated with Hashimoto thyroiditis. No other primary focus of SCC was found. Patient has shown a 48-month survival period. Clinically, primary SCCs of the thyroid and ATCs are similar. The distinction is often difficult particularly when based on the cytological analysis of FNA material.
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Lee JI, Chung YJ, Lee SY. Papillary thyroid carcinoma recurring as squamous cell carcinoma 10 years after total thyroidectomy: lessons from rapidly progressive papillary thyroid carcinoma. Intern Med 2013; 52:1593-7. [PMID: 23857092 DOI: 10.2169/internalmedicine.52.9310] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Primary squamous cell carcinoma (SCC) of the thyroid is very rare. There are no reports of metastatic papillary thyroid carcinoma (PTC) converting to SCC in cervical lymph nodes following total thyroidectomy due to conventional PTC. An 86-year-old woman with a remote history of total thyroidectomy due to PTC underwent palliative neck surgery to treat recurrent bleeding originating from a metastatic tumor of the cervical lymph nodes. The resected mass was composed of mixed SCC and PTC. Although primary SCC rarely occurs in the thyroid, conversion of PTC to SCC should be suspected if preexisting PTC exhibits highly aggressive behavior.
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Affiliation(s)
- Ji In Lee
- Department of Internal Medicine, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Korea
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Tunio MA, Al Asiri M, Fagih M, Akasha R. Primary squamous cell carcinoma of thyroid: a case report and review of literature. HEAD & NECK ONCOLOGY 2012; 4:8. [PMID: 22452749 PMCID: PMC3331844 DOI: 10.1186/1758-3284-4-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Accepted: 03/27/2012] [Indexed: 11/10/2022]
Abstract
BACKGROUND Thyroid gland lacks squamous epithelium (except in some rare situations like embroyonic remnants or in inflammatory processes); for that reason the primary squamous cell carcinoma (SCC) of thyroid is extremely rare entity, seen only in less than 1% of all thyroid malignancies and is considered almost fatal. So, far, only few case reports have been published in literature. CASE PRESENTATION Herein we present a 54 years old Saudi female with 3 months history of progressive neck swelling and hoarse voice, who was referred to us by her primary care physician as suspected case of anaplastic carcinoma of thyroid for radical external beam radiation therapy (EBRT). Fine Needle aspiration cytology (FNAC) revealed squamous cell carcinoma. Computed tomography (CT) neck showed 10 × 10 cm mass in left lobe of thyroid invading trachea and skin. Extensive staging work up ruled out the possibility of any primary site of SCC other than thyroid gland. Tumor was found unresectable and was referred to radiation oncology. She received palliative EBRT 30 Gy in 10 fractions. After completion of EBRT, there was progression of disease and patient died 3 months after completion of EBRT by airway compromise. CONCLUSION Primary SCC of thyroid is rare and aggressive entity. FNAC is reliable and effective tool for immediate diagnosis. Surgery is a curative option, but it is not always possible as most of cases present as locally advanced with adjacent organs involvement. EBRT alone was found ineffective. Aggressive combined modality (debulking surgery, radiation and chemotherapy) shall be considered for such cases.
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Affiliation(s)
- Mutahir A Tunio
- Department of Radiation Oncology, Comprehensive Cancer Center, King Fahad Medical City, Riyadh, PO 59046, Saudi Arabia
| | - Mushabbab Al Asiri
- Department of Radiation Oncology, Comprehensive Cancer Center, King Fahad Medical City, Riyadh, PO 59046, Saudi Arabia
| | - Mosa Fagih
- Department of Cytogenetics, King Fahad Medical City, Riyadh, PO 59046, Saudi Arabia
| | - Rashad Akasha
- Resident Radiation Oncology, Department of Radiation Oncology, Comprehensive Cancer Center, King Fahad Medical City, Riyadh, PO 59046, Saudi Arabia
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Metastatic tumours to the thyroid gland: report of 3 cases and brief review of the literature. Radiol Oncol 2010; 45:53-8. [PMID: 22933935 PMCID: PMC3423713 DOI: 10.2478/v10019-010-0039-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Accepted: 06/20/2010] [Indexed: 11/29/2022] Open
Abstract
Background Metastases to the thyroid are encountered rarely in clinical practice, but the number of cases seems to have increased in recent years. The reason of this increase may be a more frequent use of fine-needle aspiration biopsy (FNAB) and the use of more sophisticated, complicated imaging techniques in patients with thyroid masses. Also, in addition to these reasons, the use of more organo-specific immunohistochemical antibodies in the examination of surgical specimens may affect the differential diagnosis of malignant tumours. Case reports Three metastatic tumours to thyroid were found in the retrospective review of malignant thyroid tumours diagnosed between January 1993 and December 2007. The primary tumours were clear cell carcinoma of the kidney, squamous cell carcinoma of the lung and breast carcinoma-ductal type. Conclusions A detailed clinical history, careful histological examination and essential immunohistochemistry helped in attaining the correct diagnosis.
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