title: Phyllodes tumor metastasis to the tonsil with synchronous undifferentiated carcinoma.
abstract: BACKGROUND
  Breast tumor metastasis to the tonsil is extremely rare.
  
  
  METHODS
  A 54-year-old woman underwent resection of a breast malignant phyllodes tumor and later presented with metastasis to the lung and the left tonsil. She underwent left lower lobectomy and resection of the left tonsillar tumor. She subsequently developed undifferentiated carcinoma of the right tonsil. She underwent resection of the right tonsillar tumor and chemotherapy was started. The central venous catheter became infected with methicillin-resistant Staphylococcus aureus. Finally, she died.
  
  
  CONCLUSIONS
  To the best of our knowledge, this is the first reported case of a phyllodes tumor metastasizing to the tonsil. Furthermore, morphological and immunohistochemical study revealed that the right tonsillar tumor was irrelevant to the phyllodes tumors.
  
  
  CONCLUSIONS
  We report a case of phyllodes tumor metastasis to the left tonsil which developed undifferentiated carcinoma in the other side of tonsil later. Breast tumor metastasis to the tonsil is rare but it should be considered as a possible diagnosis.
authors.affiliation: Department of Otorhinolaryngology, Graduate School of Medicine, Nagoya University, Nagoya, Japan; Department of Otorhinolaryngology, Japan Labor Health and Welfare, Chubu Rosai Hospital, Nagoya, Japan. Electronic address: ruiruisano@gmail.com.
authors.forename: Rui
authors.initials: R
authors.lastname: Sano
authors.affiliation: Department of Otorhinolaryngology, Japan Labor Health and Welfare, Chubu Rosai Hospital, Nagoya, Japan.
authors.forename: Eisuke
authors.initials: E
authors.lastname: Sato
authors.affiliation: Department of Surgery, Chita City Hospital, Chita, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Watanabe
authors.affiliation: Department of Otorhinolaryngology, Chita City Hospital, Chita, Japan.
authors.forename: Hisakazu
authors.initials: H
authors.lastname: Oshima
authors.affiliation: Department of Otorhinolaryngology, Japan Labor Health and Welfare, Chubu Rosai Hospital, Nagoya, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ando
authors.affiliation: Department of Otorhinolaryngology, Japan Labor Health and Welfare, Chubu Rosai Hospital, Nagoya, Japan.
authors.forename: Michihiro
authors.initials: M
authors.lastname: Masaki
authors.affiliation: Department of Otorhinolaryngology, Graduate School of Medicine, Nagoya University, Nagoya, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakashima
keywords: Anaplastic carcinoma; Multiple primary; Neoplasm metastasis; Phyllodes tumor; Tonsillar neoplasm
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