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はじめに
Benign lyrnphoepithelial lesion(以下BLL)は,1952年Godwinが初めて報告したもので,臨床的には唾液腺や涙腺が片側性,あるいは両側性に,多くは無痛性に腫大する疾患である。組織学的には,腺房細胞の萎縮消失と小葉内導管周囲の線維化と著明なリンパ球浸潤がみられ,筋上皮島(EMEI)の形成を特微としている。
甲状腺組織には種々の腫瘍および腫瘍様病変があることが知られているが,病理組織学的にBLLと同じ所見を呈ける病変を認めたという報倍は見当たらない。
A 56-year-old male complained of a hard, non-tender, mobile, mass measured 5.0 x 3.0 cm in the left sternocleid muscle. The thyroid gland was diffusely swallen, and 201TI uptake was shown at the thyroid and left neck 2 hours after injection of isotope solution. A malignant thyroid tumor and metastatic lymph nodes of the left neck were suspected, and the patient was operated on. The mass was not completely removed because of adhesion of the tumor to muscles and veins around it.
The histologic examination revealed benign lymphoepithelial lesion (BLL).
The patient was followed up for 35 months after the operation, and showed no recurrence of the tumor.
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