[Dissecting popliteal cyst in rheumatoid polyarthritis: clinical and therapeutic aspects].

The authors present a dynamic observation of a patient with advanced rheumatic polyarthritis that developed considerable hydrathrosis of the left knee and popliteal deep cyst of the Backer type. The general treatment was completed with radioisotopic synoviorthesis with Au198 that administered directly in the articulation and in the cavity of the cyst, resulting in the rupture of its wall. The symptomatology of the dissecting popliteal cyst was similar to that of thrombophlebitis. Posterior incision and drainage of the cyst collection have resulted in the disappearance of the local phenomena.