A Case of Borderline Phyllodes Tumor in a 13-year-old Girl

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  • KANAYA Emi
    Departments of Surgery and Science, Faculty of Medicine, Academic Assembly, University of Toyama
  • MATSUI Koshi
    Departments of Surgery and Science, Faculty of Medicine, Academic Assembly, University of Toyama
  • NAGASAWA Shiho
    Departments of Surgery and Science, Faculty of Medicine, Academic Assembly, University of Toyama
  • ARAKI Misato
    Departments of Surgery and Science, Faculty of Medicine, Academic Assembly, University of Toyama
  • SEKINE Shinichi
    Departments of Surgery and Science, Faculty of Medicine, Academic Assembly, University of Toyama
  • TAKAGI Koji
    Diagnostic Pathology, Faculty of Medicine, Academic Assembly, University of Toyama
  • FUJII Tsutomu
    Departments of Surgery and Science, Faculty of Medicine, Academic Assembly, University of Toyama

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Other Title
  • 13歳女児に発生した乳腺境界悪性葉状腫瘍の1例
  • 13サイ ジョジ ニ ハッセイ シタ ニュウセン キョウカイ アクセイ ヨウジョウ シュヨウ ノ 1レイ

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<p>Mammary phyllodes tumor is one of relatively rare epithelial mixed tumors. It accounts for less than 1% of all mammary gland tumors, and juvenile tumors are extremely rare. It is difficult to distinguish it from fibroadenomas, especially from juvenile fibroadenomas. Therefore, it is difficult to determine the appropriate margin of resection at the time of surgery.</p><p>We experienced a case of a 13-year-old girl who was diagnosed with a borderline phyllodes tumor by postoperative pathology.</p><p>The patient was aware of a lump in her right breast. A needle biopsy revealed a fibroadenoma. However, the patient underwent lumpectomy because it tended to increase in size during observation suggestive of phyllodes tumor. Postoperative pathology revealed a diagnosis of borderline phyllodes tumor. The patient has been free from recurrence for 2 years after surgery.</p><p>Since there is no clear consensus on the margin of resection of phyllodes tumors, and many reports indicate that the margin does not correlate with the recurrence rate, it appears that additional resection is not necessary even with a diagnosis of phyllodes tumor. In breast surgery for juvenile patients, we should consider not only the cure but also the cosmetic benefits and preservation of future lactation function.</p>

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