Monarch Disease Ontology term MONDO_0006424 (soft tissue neoplasm) is a benign, intermediate, or malignant neoplasm that arises from the soft tissue. The most common types are lipomatous (fatty), vascular, smooth muscle, fibrous, and fibrohistiocytic neoplasms. Also known as: neoplasm of soft tissue, neoplasm of the soft tissue, soft tissue tumor, soft tissue tumors, soft tissue tumour, soft tissue tumours, tumor of soft tissue, tumor of the soft tissue.