Lymphoscintigraphic Findings in Patients With Lipedema: A Systematic Review.

BACKGROUND: Lipedema is a chronic disorder characterized by excessive, bilateral, and symmetrical deposition of subcutaneous adipose tissue, predominantly in the lower extremities. Despite its prevalence, lipedema is frequently misdiagnosed as lymphedema, and lymphoscintigraphy is commonly used to differentiate between the two. This systematic review synthesizes the available evidence regarding the most common lymphoscintigraphy findings in patients with lipedema. METHODS: This systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A comprehensive search was performed across the MEDLINE/PubMed, Embase, and Web of Science databases. Studies were included if they reported lymphoscintigraphy findings in patients with lipedema and provided a clear description of the imaging protocol. Extracted data included patient demographics, lymphoscintigraphy protocols, and imaging findings. RESULTS: Seven studies met the inclusion criteria, encompassing 470 patients, of whom 311 had lipedema. The mean age was 47.4 years, and all patients were women. The mean body mass index was 32.6 kg/m2. Lymphoscintigraphy findings were normal in 61.4% of patients with lipedema. Tortuous lymph vessels were the most common abnormality (56.8%), followed by collateral lymph vessels (49.1%) and popliteal node visualization (44.0%). Dermal backflow (3.8%) and secondary lymphedema (11.8%) were less frequent. CONCLUSIONS: Lymphoscintigraphic alterations in patients with lipedema seem to reflect lymphatic overload rather than frank insufficiency. However, significant heterogeneity in study methodologies precluded a quantitative meta-analysis. Future research should focus on establishing standardized, consensus-based imaging protocols to better define the role of lymphoscintigraphy in the diagnosis and staging of lipedema.