Cancer treatment comes with its own language, and lymphatic care has a particularly dense dialect of it. CDT. MLD. CLT-LANA. Stage II. L-Dex. Class 2 flat knit. Cording. LVA.
Most of these get used in appointments as though everyone already knows them. Most people don’t, and asking feels awkward when there are bigger things to discuss.
So here they are, decoded. For each: what it means, why it matters to you, and what’s worth asking.
The Conditions
Lymphedema Persistent swelling caused by impaired lymphatic drainage, most often after lymph nodes have been removed or irradiated. It’s protein-rich fluid rather than plain water, which is why elevation and diuretics don’t resolve it. Why it matters: It’s chronic and manageable, not curable — but well-managed lymphedema can be close to invisible in daily life, and early treatment produces far better outcomes than late treatment. Worth asking: “Given my surgery and radiation, what is my individual risk, and what should I watch for?”
Primary vs. secondary lymphedema Primary is caused by an inherited or developmental difference in the lymphatic system. Secondary is caused by damage — surgery, radiation, infection, trauma. Cancer-related lymphedema is secondary.
Lipedema A different condition entirely — a symmetrical, often painful accumulation of fat tissue, usually in the legs, typically sparing the feet. It’s frequently confused with lymphedema and mismanaged as a result. Why it matters: The treatments overlap but aren’t identical, and getting the diagnosis right changes the plan.
Cording, or axillary web syndrome Tight, visible or palpable cords running from the armpit down the inner arm, sometimes to the wrist. Typically appears within weeks to a few months after axillary surgery, and can limit how far you can raise your arm. Why it matters: It looks alarming and often isn’t. It generally responds well to stretching and manual therapy, but it’s under-recognized and frequently left untreated. Worth asking: “Is this cording, and can it be treated?”
Fibrosis Hardening and thickening of tissue, from radiation or from long-standing untreated swelling. Fibrotic tissue is much harder to reverse than fluid. Why it matters: This is the main argument for early intervention. Fluid moves. Fibrosis mostly doesn’t.
Cellulitis A bacterial skin infection. In an at-risk limb it presents as sudden redness, warmth, tenderness, sometimes a spreading rash, often with fever or feeling unwell. Why it matters: This is the one true emergency on this list. It needs prompt antibiotics. Each episode can worsen lymphatic function, and recurrent cellulitis makes lymphedema progressively harder to manage. Do not wait to see whether it settles.
Seroma A collection of fluid in the space where tissue was removed. Common after surgery, usually temporary, sometimes drained.
The Measurements and Stages
ISL stages The International Society of Lymphology staging system, running from 0 to III:
- Stage 0 (subclinical or latent): lymphatic drainage is impaired but there’s no visible swelling. Can persist for months or years.
- Stage I: swelling that pits when pressed and reduces with elevation. Early and most treatable.
- Stage II: swelling that no longer reduces with elevation, with tissue becoming firmer as fibrosis develops.
- Stage III: advanced tissue changes, significant skin changes.
Why it matters: Stage drives treatment intensity and expectations. Stage 0 and I are where the biggest wins are available.
Bioimpedance spectroscopy, sometimes called L-Dex A painless test passing a tiny electrical current through the limb to detect changes in extracellular fluid — often before swelling is visible. Why it matters: It can identify subclinical lymphedema at a point where light intervention may prevent progression. Surveillance programs using it have shown promise compared with waiting for tape-measure changes. Worth asking: “Is bioimpedance surveillance available to me, and how often should I be monitored?”
Perometry and circumferential measurement Perometry uses infrared light to calculate limb volume. Circumferential measurement is the tape measure at set intervals along the limb. Why it matters: Whichever is used, what counts is consistent measurement over time. A single measurement tells you far less than a series.
The Treatments
CDT — Complete (or Complex) Decongestive Therapy The internationally recognized standard of care. It has four components: manual lymphatic drainage, compression, exercise, and skin care. It runs in two phases — an intensive reduction phase, then a lifelong maintenance phase you largely manage yourself. Why it matters: If someone offers you one component in isolation and calls it lymphedema treatment, that’s not CDT. Worth asking: “Which phase am I in, and what does my maintenance program look like?”
MLD — Manual Lymphatic Drainage A specific, very light hands-on technique that stimulates lymphatic vessels and redirects fluid toward functioning pathways. It bears no resemblance to deep tissue massage — pressure is extremely gentle, because the vessels being targeted sit just beneath the skin. Why it matters: Firm massage on a lymphedematous limb is not a stronger version of MLD. It’s a different thing, and it isn’t helpful.
Compression bandaging vs. compression garments Short-stretch bandaging is typically used during the intensive phase to reduce volume. Garments — sleeves, gauntlets, stockings — maintain the reduction afterward. Why it matters: These aren’t interchangeable, and the sequence matters.
Flat knit vs. circular knit Circular knit garments are seamless and finer; flat knit are made as a flat piece and seamed, are firmer, and handle irregular limb shapes better. Why it matters: Flat knit is often needed for more advanced or misshapen limbs. Being given the wrong type is a common reason garments don’t work.
Compression class The pressure level of a garment, usually stated as a class or a millimetres-of-mercury range. Why it matters: Too little does nothing, too much can be harmful, and correct fitting is essential. Garments generally need replacing roughly every six months as they lose elasticity. Worth asking: “Who fits my garment, and how often should it be replaced?”
Pneumatic compression pump A sleeve with inflating chambers used at home. Can be useful as an adjunct for some people. Why it matters: An addition to a program, not a replacement for one, and not appropriate for everyone.
The People
CLT — Certified Lymphedema Therapist A physical therapist, occupational therapist, or other clinician who has completed accredited training in lymphedema management, typically a 135-hour program.
CLT-LANA A CLT who has additionally passed the certification examination of the Lymphology Association of North America. Why it matters: Lymphedema care is a specialty. General massage therapy or general physical therapy is not equivalent. Worth asking, directly: “Are you a certified lymphedema therapist?” It’s a reasonable question and any good clinician will welcome it.
The Surgical Options
LVA — Lymphaticovenous anastomosis Microsurgery connecting tiny lymphatic vessels directly to nearby small veins, creating a bypass. Generally most suitable earlier, when vessels remain functional.
VLNT — Vascularized lymph node transfer Transplanting healthy lymph nodes with their blood supply from elsewhere in the body into the affected area.
Debulking or suction-assisted lipectomy For advanced lymphedema where the excess is largely fat and fibrous tissue rather than fluid. Why it matters for all three: These are specialist procedures with specific criteria, and none of them removes the need for ongoing compression and management. Worth asking: “Am I a candidate for surgical options, and what would they realistically achieve?”
Two Things Worth Knowing Beyond the Vocabulary
Lymphedema isn’t only an arm problem. Treatment for gynecologic, prostate, bladder, and melanoma cancers can cause leg or genital lymphedema. Head and neck cancer treatment can cause facial and neck lymphedema, including internal swelling affecting swallowing. These are less discussed and equally treatable.
Nobody should tell you this was preventable. Risk-reduction is worth doing, but lymphedema develops in people who did everything right. If anyone implies otherwise, they’re wrong.
Bring Your Questions
You shouldn’t need a glossary to understand your own care. But since you do, you may as well use it.
Uplifted Oncology Rehab offers a free discovery visit at no cost and no obligation. Bring the terms you didn’t want to ask about, the letter you didn’t fully follow, and any swelling or tightness you’ve been unsure about. You’ll get plain answers, a proper assessment, and a clear sense of what should happen next.
We work alongside your oncology team, not around them.