title: Synchronous papillary thyroid carcinoma and breast ductal carcinoma: A rare case report and literature review.
abstract: BACKGROUND
  The incidences of both thyroid cancer and breast cancer have been rising in recent years; however, it is very rare to find a single person with both of these cancers. Only a few cases of synchronous thyroid and breast cancer have been published, and even fewer cases have been reported in older patients (>60 years).
  
  
  METHODS
  The current study presents a case of synchronous papillary thyroid carcinoma and breast ductal carcinoma in an elderly patient. The patient first underwent a mastectomy and axillary lymphadenectomy in our department, followed by a total thyroidectomy and lymphadenectomy of the left lateral region of the neck 1 month later. Postoperative pathological examination identified invasive ductal carcinoma of the breast and papillary carcinoma of the thyroid. Over almost half a year of follow-up, the patient has exhibited no evidence of recurrence or metastasis, as demonstrated by careful ultrasound examinations. Herein, we not only report this case but also present a systematic review of the causes, diagnosis, and treatment of synchronous breast and thyroid cancer.
  
  
  CONCLUSIONS
  Although synchronous primary tumors of the thyroid and breast are very rare, they remain a possibility; therefore, more attention should be paid to these cases.
authors.affiliation: Department of Pathology, West China Hospital of Sichuan University Thyroid and Parathyroid Surgery Group, West China Hospital of Sichuan University, Chengdu 610041, China.
authors.forename: Jinjing
authors.initials: J
authors.lastname: Zhong
authors.forename: Jianyong
authors.initials: J
authors.lastname: Lei
authors.forename: Ke
authors.initials: K
authors.lastname: Jiang
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Li
authors.forename: Rixiang
authors.initials: R
authors.lastname: Gong
authors.forename: Jingqiang
authors.initials: J
authors.lastname: Zhu
mesh_terms: D001943:Breast Neoplasms / Q000150:complications* / Q000473:pathology / Q000601:surgery; D002277:Carcinoma / Q000150:complications* / Q000473:pathology / Q000601:surgery; D018270:Carcinoma, Ductal, Breast / Q000150:complications* / Q000473:pathology / Q000601:surgery; D002291:Carcinoma, Papillary; D005260:Female; D006801:Humans; D008197:Lymph Node Excision; D008408:Mastectomy; D008875:Middle Aged; D000077273:Thyroid Cancer, Papillary; D013964:Thyroid Neoplasms / Q000150:complications* / Q000473:pathology / Q000601:surgery; D013965:Thyroidectomy