A distinctive colour associated with high iodine content in malignant pleural effusion from metastatic papillary thyroid cancer: a case report

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• 作者：Andrew Rosenstengel (7)
  Ee Mun Lim (6)
  Michael Millward (6) (7)
  YC Gary Lee (6) (7) (7)
  
• 关键词：Pleural effusion ; Iodine ; Thyroglobulin ; Diagnosis ; Thyroid ; Carcinoma ; Colour
• 刊名：Journal of Medical Case Reports
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：7
• 期：1
• 全文大小：249KB
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• 作者单位：Andrew Rosenstengel (7)
  Ee Mun Lim (6)
  Michael Millward (6) (7)
  YC Gary Lee (6) (7) (7)
  
  7. Centre for Asthma, Allergy & Respiratory Research, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
  6. School of Medicine and Pharmacology, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
  

文摘

Introduction Pleural effusions are a common clinical problem and affect about one million people in the United States and United Kingdom each year. Over 60 causes of pleural effusion have been identified; establishing the definitive aetiology can be difficult, and often requires invasive procedures. Guidelines state that macroscopic examination of the fluid should be the first step in determining the aetiology of a pleural effusion. Papillary thyroid carcinoma is an uncommon cause of malignant pleural effusion, with only 10 cases reported in the literature, their physical characteristics and composition having been rarely described. We describe for the first time a distinctive brown colour of the malignant effusion (despite centrifugation) from a rare case of metastatic papillary thyroid cancer to the pleura, associated with a high pleural fluid iodine content. Such a characteristic may be useful in expediting diagnosis of a malignant pleural effusion in the appropriate clinical context. Case presentation We present the case of a 71-year-old Caucasian man with metastatic papillary thyroid cancer; a large, long-standing, right-sided pleural effusion and a 83-fold higher pleural thyroglobulin level compared to corresponding serum, supporting this malignancy as the cause of the patient’s effusion. The pleural fluid had a distinctive pigmentation similar to iodine-containing antiseptic preparations. Biopsy during medical thoracoscopy confirmed metastatic papillary thyroid carcinoma. Analysis of pleural fluid showed a pleural thyroglobulin level over 80 times that of serum levels (29,000μg/L versus 350ug/L). Pleural fluid iodine content was 23,000ug/L and may account for the fluid’s distinctive pigment, as iodine is an essential component in thyroglobulin and thyroid hormone synthesis. Conclusions Pleural fluid pigmentation may aid diagnosis in the appropriate clinical setting. A distinctive iodine-like brown colour of pleural fluid may represent elevated iodine content and should raise consideration of metastatic thyroid cancer as a cause for a pleural effusion.