Assessment Modalities for Lower Extremity Edema, Lymphedema, and Lipedema: A Scoping Review.

Area of Science:

• Medical diagnostics
• Radiology
• Vascular medicine

Background:

• Lower extremity swelling is commonly caused by edema, lymphedema, or lipedema.
• Accurate differentiation is crucial for effective treatment selection.
• Various diagnostic modalities exist, each with unique strengths and weaknesses.

Purpose of the Study:

• To systematically review and compare clinical diagnostic modalities for lower extremity swelling.
• To aid clinicians in selecting the most appropriate diagnostic tool based on condition and patient factors.
• To highlight the advantages and limitations of each investigated method.

Main Methods:

• Systematic literature search using PRISMA guidelines across multiple databases (PubMed, ProQuest, etc.).
• Investigation of diagnostic methods including ultrasound (US), lymphoscintigraphy (LSG), CT, bioimpedance spectroscopy (BIS), tissue dielectric constant (TDC), and MRI (including MRL).
• Critical evaluation of 31 selected studies from an initial retrieval of 115.

Main Results:

• Duplex US is the preferred initial modality for edema (e.g., DVT, venous reflux).
• CT venography is suitable for gynecologic cancer patients post-treatment to assess DVTs, lymphoceles, and recurrence.
• TDC is recommended for edema and lymphedema due to non-invasiveness and ease of use.
• LSG is effective for lymphedema characterization with high sensitivity and specificity.
• BIS has limitations in sensitivity and accounting for tissue changes in lymphedema.
• US and MRL are favored for lipedema, with MRL offering detailed insights but facing accessibility issues.
• MRI is preferred for differentiating lymphedema from lipedema due to its comprehensive diagnostic capabilities, with US as a practical alternative.

Conclusions:

• The choice of diagnostic modality for lower extremity swelling depends on the suspected condition (edema, lymphedema, lipedema) and clinical context.
• Ultrasound and MRI are versatile tools, with specific applications and limitations for each condition.
• Further research may refine the utility of modalities like BIS and TDC in specific patient populations.