特殊な食道腫瘍のX線診断

Radiological Diagnosis of Special Variants of Esophageal Tumors

要旨●特殊な食道腫瘍として，類基底細胞（扁平上皮）癌，食道癌肉腫，腺扁平上皮癌，粘表皮癌，腺様囊胞癌，内分泌腫瘍/内分泌細胞癌，未分化癌，悪性黒色腫について，X線診断を中心に述べた．いずれも極めてまれな疾患である．また，肉眼的に隆起を示す傾向があるため，隆起の立ち上がりの状態，隆起の基部の形状，隆起の形態，表面の性状，上皮内進展の有無などを読み取る必要がある．X線診断においては形態的にどう捉えるかが重要であるため，形態的な特徴をイメージしながら鑑別診断を行う必要がある．

　Herein we described about the radiological diagnosis of special variants of esophageal tumors such as basaloid（-squamous）carcinoma, carcinosarcoma, adenosquamous cell carcinoma, mucoepidermoid carcinoma, adenoid cystic carcinoma, endocrine cell carcinoma（neuroendocrine carcinoma）, undifferentiated carcinoma, and malignant melanoma. All these tumors are extremely rare.

　Furthermore, they tend to develop elevated lesions ; thus, we need to assess the increase in ridge size, the shape of ridge base, the form of ridge as well as surface configuration and intraepithelial spread. It is important to grasp the form in radiological diagnosis ; therefore, a differential diagnosis must be made while imaging morphological features.