Impact of carpal tunnel syndrome surgery on women with breast cancer-related lymphedema.

Carpal tunnel syndrome may occur in women with ipsilateral lymphedema after breast cancer treatment. Surgery on the lymphedematous arm is classically feared. Thirty-two consecutive women (mean age at cancer treatment 49 years, interquartile range (Q1;Q3) 43;56) with upper limb lymphedema after breast cancer treatment, followed in a single lymphology unit, and symptomatic carpal tunnel syndrome (electromyographically confirmed) requiring surgery were included. Lymphedema volume was calculated using the truncated cone formula, recorded before and after carpal tunnel syndrome surgery, and at each follow-up visit. Median time to lymphedema onset after cancer treatment was 19 (interquartile range (Q1;Q3) 5;73) months. Median lymphedema volume was 497 (Q1;Q3 355;793) mL before (median 4 months) and 582 (Q1;Q3 388;930) mL after carpal tunnel syndrome surgery (median 5 months) (P = 0.004). At the last follow-up post-carpal tunnel syndrome surgery (median 33 months), lymphedema volume was 447 (Q1;Q3 260;733) mL (non-significant, compared to pre-surgery volume). Regular lymphedema treatment included elastic sleeve (n = 31), low-stretch bandage (n = 20), and/or manual lymph drainage (n = 20), with no change before and after carpal tunnel syndrome surgery. All carpal tunnel syndrome clinical manifestations disappeared after surgery and none of the patients experienced local complications. Carpal tunnel syndrome may be treated surgically in women with ipsilateral upper limb lymphedema after breast cancer treatment. Although lymphedema volume increased transiently, it remained stable over long-term follow-up, with no local complications.