Lipedema / lymphedema — Reference values

Lipedema / lymphedema — Reference values: Subcutaneous thickness — thigh (comparison), Dermal thickness, Subcutaneous fluid (anechoic clefts/lakes).

Ultrasound does not establish the diagnosis of lipedema (which is clinical), but it measures the subcutis, shows the fat pattern and helps differentiate from lymphedema (fluid/cobblestone) and edema of other causes. Always compare both sides and the thigh→ankle gradient.

Measurements and reference values

Measurement	Usual value	Note
Subcutaneous thickness — thigh (comparison)	no universal cutoff mm	Highly BMI-dependent; what matters is symmetry and the thigh→ankle gradient. In lipedema the subcutis is disproportionately thick, symmetric and without fluid.Source: Naouri J Eur Acad Dermatol 2010 / Consenso europeu 2020
Dermal thickness	≤ ~2 mm	Dermal thickening with subcutaneous fluid favors lymphedema, not pure lipedema.usual: ≤2 mmborderline: 2–3 mmthickened (lymphatic component): >3 mmSource: Suehiro (US do linfedema) / EFSUMB
Subcutaneous fluid (anechoic clefts/lakes)	absent in pure lipedema	"Cobblestone" or anechoic lakes pattern indicates a lymphatic component (lymphedema or lipolymphedema).Source: ISL Consensus 2020 / EFSUMB

Classifications and calculators

Calculator — lipedema support (clinical + US)

Color	Practical reading
Green	Pattern consistent with lipedema: diffuse symmetric hypoechoic fat, no fluid; foot spared; negative Stemmer.
Yellow	Probable but with overlap/advanced stage — document and correlate clinically.
Red	Fluid/lymphedema signs (clefts, lakes, foot involvement, positive Stemmer): lipolymphedema — refer for lymphatic therapy.

Lipedema is a clinical diagnosis. There is no single validated ultrasound classification; US documents the subcutis and rules out lymphedema.

Source: Consenso europeu de lipedema 2020 (Phlebology) / Diretriz S1 alemã 2017

Clinical stages of lipedema

Stage	Skin surface	Subcutis
I	Smooth, regular	Thickened and uniform, homogeneous hypoechoic fat
II	Uneven, "mattress", palpable nodules	More evident nodules and septa
III	Deforming fat lobules	Large lobules, contour distortion
IV	Lipedema + lymphedema (lipolymphedema)	Fat + fluid/fibrosis; foot may be involved

Clinical stage refers to skin/tissue; pain, fatigue and functional impact do not necessarily follow the stage. Types 1–5 describe distribution (hip, thigh, calf, arms).

Source: Consenso europeu 2020 / Wold-Allen 1951

Calculator — lymphedema staging (ISL)

Color	Practical reading
Green	No US signs of lymphedema (no fluid, normal dermis).
Yellow	Early/reversible edema: fine clefts, positive Stemmer, still pitting.
Red	Established: anechoic lakes, thickened dermis, fibrosis (non-pitting).

US complements the clinical exam; lymphoscintigraphy remains the standard to confirm lymphatic dysfunction.

Source: ISL Consensus 2020 (Lymphology)

ISL lymphedema stages

Stage	Clinical	Typical US
0	Latent/subclinical (no visible edema)	No fluid; may show mild thickening
I	Edema reducing with elevation (pitting)	Fine subcutaneous clefts
II	Does not reduce spontaneously; increasing fibrosis	Anechoic lakes, thickened dermis
III	Elephantiasis, skin changes	Dense fibrosis, variable fluid

ISL staging is clinical; US helps grade fluid/fibrosis and monitor decongestive therapy.

Source: ISL Consensus 2020

Lipedema vs lymphedema — how to tell apart

Feature	Lipedema	Lymphedema
Symmetry	Bilateral and symmetric	Often asymmetric/unilateral
Foot/dorsum	Spared (cuff sign)	Involved
Stemmer sign	Negative	Positive
Pressure pain	Typical	Less common
Subcutaneous fluid on US	Absent	Present (cobblestone/lakes)
Dermal thickening	Absent/mild	Present

Coexistence (lipolymphedema) is common in advanced stages. When in doubt, combine findings and consider lymphoscintigraphy.

Source: Consenso europeu 2020 / ISL 2020

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