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はじめに
頭頸部悪性腫瘍は,わが国における全悪性腫瘍の約5%程度で,そのなかでも下咽頭悪性腫瘍は比較的少なく,おおむね頭頸部悪性腫瘍の約10%程度とされる1)。組織学的には,大部分の下咽頭悪性腫瘍は通常の扁平上皮癌であるため,そのほかの希少病理についての疫学的文献報告は乏しい。今回,過去10年間に当科で経験した下咽頭悪性腫瘍症例の病理組織を統計分析し,特に通常の扁平上皮癌以外の症例に重点をおいて臨床的検討および文献的考察を行った。
This study included 189 patients(169 men, 20 women)with hypopharyngeal malignancies who were evaluated in our department between April 2002 and March 2012. The pathologies included 173 cases(91.5%)of squamous cell carcinoma, 4 of malignant lymphoma, 4 of lymphoepithelial carcinoma, 3 of carcinoma in situ, 2 of spindle cell carcinoma, 2 of basaloid squamous cell carcinoma, and 1 of carcinoma ex pleomorphic adenoma. Squamous cell carcinoma including its variants accounted for 180 cases(95.2%). There were 185 cases(97.9%)of epithelial tumors, on the other hand, only 4 cases(2.1%)of non-epithelial tumors involved malignant lymphoma.
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