A Case Report of Alveolar Soft Part Sarcoma

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The patient, a 21 years old female, noted a painless mass in the medial aspect of her left knee in October 1970. As the mass gradually increased its volume, she consulted with an orthopedist, who diagnosed it to be a aneurysma at the knee.She visited our clinic on March 22, 1971. We palpated a remarkably pulsate mass as great as hen's egg and noticed the vascular noise by auscultation.The angiogram showed a characteristic figure which the contrast medium pooled closely in the mass. A well circumscribed and thin encapsulated tumor, 3×3×4.5cm., was removed from the left m. vastus medialis on April 30, 1971. The outer surface was dark red and slightly nodular, the cut surface was yellow gray with mottled hemorrhage areas. Fine trabeculaes transversed the surface forming small lobules of homogeneous tissue.Microscopic diagnosis was alveolar soft part sarcoma.After the exsirpation, irradiation therapy was given.A dose of 8, 000 rads was delivered to the operated site.She is now in good health without recurrence or metastasis.
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