- Subcutaneous, intramuscular, and intraosseous synovial cyst formation around the knee in rheumatoid arthritis/systemic lupus erythematosus overlap syndrome. Yamamoto, T., Akisue, O., Marui, T., Kawamoto, T., Nagira, K., Nakagawa, A., Yoshiya, S., Kurosaka, M. J. Rheumatol. (2003)