alveolar soft part sarcoma (MONDO_0011655) is an alveolar soft part sarcoma occurring in adults. The most common site of involvement is the extremity, particularly the deep soft tissues of the thigh. Also known as: ASPS, adult alveolar soft Part sarcoma, adult alveolar soft part sarcoma, adult alveolar soft-Part sarcoma, alveolar soft Part sarcoma, alveolar soft part sarcoma (disease), alveolar soft-part sarcoma.