Recent studies have shown that expression of alternatively splicing variants of CD44 is correlated with prognosis for several kinds of malignant tumors. However, little is known about the expression of CD44 standard and variant isoforms in soft tissue sarcomas. In this study 47 cases of soft tissue sarcoma [18 malignant fibrous histiocytomas (MFHs), 13 synovial sarcomas (SSs), 7 malignant schwannomas (MSs), and 9 liposarcomas (LSs)] were examined immunohistochemically. The monoclonal antibodies to the standard form of CD44 (CD44H) and variant exons of CD44v3, 4, 5, 6, 7, 9, and v10 were used. We analyzed the membranous expression pattern of CD44H and CD44 variant exons and assessed the relation between expression of CD44s and metastasis-free survival rates (MFSR) of patients with soft tissue sarcoma. A few sarcomas expressed CD44v3 (2/47) and v7 (2/47), but none of the sarcomas expressed CD44v10. CD44v4 (5/47), v5 (4/47), v6 (10/47), and v9 (9/47) are relatively common types of variant isoforms in soft tissue sarcomas. Expression of CD44v6 is more frequently detected in high-grade than in low-grade tumors. CD44v6 or CD44v9 expression was correlated with metastasis-free survival of patients with soft tissue sarcomas.

Summary: We report the case of a 63-year-old man who presented with a mass on the right clavicle near the sternoclavicular joint. He had received prior puncturing treatment, but relapsed each time. Magnetic resonance imaging revealed that the mass was a ganglion cyst, which appeared to be connected to the right clavicle. Excisional biopsy revealed that the cyst was an intraosseous ganglion cyst, and the cavity was connected to the sternoclavicular joint. The cavity was filled with an artificial bone graft after curettage to prevent fracture. Histological examination showed that the cyst wall had no lining cells and consisted of fibrous connective tissue. To the best our knowledge, this case is the first report of an intraosseous ganglion cyst of the sternoclavicular joint.

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