Mother has mantle cell lymphoma . While she was sitting and visiting with Dad in hospital, her Rt. ankle began to swell. It has been 5 days. We had her elevate her leg and in the Am it is better, but then swells again. Had her wear compression sock, but swelling appeared to move to knee area. She hasn t worn a sock today but has been on and off her feet , but now her whole leg is swollen and feels some tenderness in upper thigh level. Should I take her to ER tomorrow. Has appt. with oncologist on 30th. No family Dr. since she is from out of town.