Good afternoon. i have gone through your sister history. First of all i would like to know when she had her kidney carcinoma diagnose and timing of her ablation therapy and whether she is on any medication now? the presentation of your sister points towards some mechanical obstrution in the lower part of esophagus( e.g., stricture). I think she should see the gastroenterologist and do barium swallow. As she has history of cancer and ablation she should undergo thorough investigation to rule out any other recurrence or complication.