Baker's cysts are rare cause of peripheral nerve entrapment and only a few cases of tibial nerve entrapment resulting from the popliteal cyst in the calf muscle have been reported in the literature. We present a case of rheumatoid arthritis complicated by a Baker's cyst with a tibial nerve entrapment. It is important to diagnose a Baker's cyst early and to differentiate it from thrombophlebitis, a popliteal aneurysm, tumor or muscle tear to effect optimal therapy and to obviate a potential neuropathy. Prompt recognition of these cases may save the patients unnecessary procedures and delay in treatment.
Arthritis, Rheumatoid/diagnosis ; Arthritis, Rheumatoid/complications ; Biopsy, Needle ; Case Report ; Electromyography ; Female ; Follow-Up Studies ; Human ; Magnetic Resonance Imaging ; Middle Age ; Popliteal Cyst/surgery ; Popliteal Cyst/diagnosis ; Popliteal Cyst/complications+ACo- ; Tibial Neuropathy/etiology+ACo- ; Tibial Neuropathy/diagnosis ; Treatment Outcome