title: Co-occurrence of papillary thyroid cancer and MALT lymphoma of the thyroid with severe airway obstruction: A case report and review of the literature.
abstract: BACKGROUND
  Co-occurrence of papillary thyroid carcinoma (PTC) and mucosa-associated lymphoid tissue (MALT) lymphoma resulting in severe airway obstruction is very rare.
  
  
  METHODS
  A 58-year-old woman visited our department because of enlargement of a neck mass. Computed tomography (CT) and ultrasonography showed 2 discrete hypoechoic nodules. Fine-needle aspiration biopsy revealed thyroid lymphoma in the left lobe and PTC in the right lobe. After 1 week, she returned to the emergency room at our hospital with shortness of breath and difficultly in swallowing. CT revealed enlargement of the left lobe, which was severely compressing the trachea. We performed emergency total thyroidectomy with lymphadenectomy. The postoperative course was uneventful, and the patient was discharged without any symptoms.
  
  
  CONCLUSIONS
  The most common treatment for PTC is surgery; however, the treatment for thyroid lymphoma remains controversial. We propose that surgery be performed in the cases of symptoms such as shortness of breath and difficulty in swallowing.
  
  
  CONCLUSIONS
  We performed emergency total thyroidectomy to relieve obstruction of the trachea and to remove the two malignant tumors. We suggest total thyroidectomy for a case of co-occurrence of two malignant tumors, causing severe airway obstruction.
authors.affiliation: General and Cardiothoracic Surgery, Kanazawa University, Kanazawa, Japan. Electronic address: tatsuya.tarui@gmail.com.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Tarui
authors.affiliation: General and Cardiothoracic Surgery, Kanazawa University, Kanazawa, Japan.
authors.forename: Norihiko
authors.initials: N
authors.lastname: Ishikawa
authors.affiliation: General and Cardiothoracic Surgery, Kanazawa University, Kanazawa, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kadoya
authors.affiliation: General and Cardiothoracic Surgery, Kanazawa University, Kanazawa, Japan.
authors.forename: Go
authors.initials: G
authors.lastname: Watanabe
keywords: Airway obstruction; Emergency total thyroidectomy; MALT lymphoma; Papillary thyroid carcinoma
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