右大円筋に発生した筋肉内粘液腫(Stout and Enzinger)の1例

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  • INTRAMUSCULAR MYXOMA IN THE RIGHT TERES MAJOR MUSCLE -A CASE REPORT-

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This paper was reported an extremely rare case of intramuscular myxoma having occurred in the right teres major muscle.<br> The patient was a 42-years-old woman who mainly complained of a fist-sized mass in the right axillary fossa. CT revealed a low-density mass between the right teres major muscle and the lattissimus dorsi muscle. Angiography showed that the right subscapular artery was compressed toward the inside. The mass extirpated with a diagnosis of benign soft tissue tumor. The tumor was covered with part of the teres major and minor muscles, measured 7.5×6.3×5.2cm, and weighed 160g. The cut surface revealed solid tumor with mucus. On histological examination, the mucous matrix was composed of hyaluronic acid and the tumor was hypovascular, poor in pleomorphism of the nucleus, without particular differentiation. The condition was diagnosed intramuscular myxoma, as reported by Stout, Enzinger et al. The definition and origin of myxoma are unclear.<br> Cases of myxoma or similar conditions which have been reported in Japan total 62 (excluding heart, jaw, and subcutaneous cases), however, among of them, myxoma according to the criteria of Stout and Enzinger numbered only 10.

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