Mixed Connective Tissue Disease and Papillary Thyroid Cancer: A Case Report.

Supat Thongpooswan
Supat Thongpooswan
Queens Hospital Center
United States
Rachel Tushabe
Rachel Tushabe
Icahn School of Medicine at Mount Sinai Service
Paul Kim
Paul Kim
University of Southern California
United States
Adriana Abrudescu
Adriana Abrudescu
Icahn School of Medicine at Mount Sinai

Am J Case Rep 2015 Aug 6;16:517-9. Epub 2015 Aug 6.

Department of Internal Medicine, Icahn School of Medicine at Mount Sinai Service, Queens Hospital Center, Jamaica, NY, USA.

Background: Mixed connective tissue disease (MCTD) is a connective tissue disorder characterized by high titers of distinct antibodies: U1 ribonucleoprotein with clinical features seen in systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), dermatomyositis (DM), polymyositis, and scleroderma. The association of SLE and DM with various cancers of the thyroid has been reported in the literature. However, there have been no reports associating MCTD with thyroid cancer.

Case Report: We present a 58-year-old woman diagnosed with MCTD with co-morbid interstitial lung disease that has remained stable for 10 years, who developed papillary thyroid carcinoma (PTC) 10 years after initial diagnosis.

Conclusions: We theorize that: 1) MCTD may have been a primary diagnosis complicated by PTC, or 2) MCTD may have been an initial presentation of paraneoplastic syndrome of silent PTC, because her symptoms of MCTD significantly improved after total thyroidectomy. To the best of our knowledge, this is the first case report to associate MCTD with PTC. It highlights the importance of maintaining a high index of suspicion for thyroid malignancy in MCTD patients.
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August 2015
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