Publications

BACKGROUND: The inability to directly measure real-time lymphatic transport hinders our understanding of lymphatic disorders and effective monitoring of therapeutic interventions. Here, we report three refinements to the use of novel near-infrared fluorophores in a large animal model for assessment of lymphatic function using optical fluorescence with the ultimate goal of direct clinical translation.

METHODS: A lymphadenectomy and lymphovenous bypass was performed in the left groin. Two different near-infrared (NIR) fluorophores composed of the identically same scaffold were injected into the respective hind limbs of female swine. Transit from injection sites into the lymphatic system and systemic circulation was assessed over three hours of NIR imaging immediately following injections. Albumin-conjugated fluorophores with 700 nm and 800 nm emission, respectively, were delivered with manual intradermal injection. Blood and urine samples were collected at standard time points. Continuous NIR imaging of the lymphovenous bypass and the superficial epigastric vein and its adjacent skin was also performed at standard time points. Blood and urine samples were collected to analyze systemic concentrations and renal excretion of both fluorophores, respectively. NIR imaging was performed to analyze real-time lymphatic transport of the fluorophores through the lymphovenous bypass and in the central circulation.

RESULTS: Fluorophore pharmacokinetics with albumin conjugation and manual intradermal injections produced inconsistent results. Three modifications to the study protocol were designed. Fluorophores were modified from albumin conjugation to polyethylene glycol (PEG) conjugation. Fluorophores were delivered with VAX-ID ® devices instead of manual intradermal injections. Additionally, a novel correction factor was developed to account for differences in NIR fluorescence between the fluorophores.

CONCLUSION: The refinement of a large animal model to assess real-time lymphatic function represents a crucial step toward clinical translation. The optimized fluorophore composition and delivery mechanism captures dynamic changes in lymphatic function.

SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12880-025-02057-6.

Lymphedema is a chronic, progressive condition characterized by the accumulation of protein-rich interstitial fluid due to impaired lymphatic transport. It significantly impairs quality of life and presents complex diagnostic and therapeutic challenges. Despite its prevalence, lymphedema remains underdiagnosed and undertreated, in part due to limited provider education and a lack of access to coordinated care. For this reason, a multidisciplinary approach to lymphedema management is crucial. Early diagnosis is critical and requires collaboration across primary care, oncology, vascular medicine, radiology, lymphatic therapy, and surgery. There are increasing imaging techniques available, but require unique skill sets to perform and interpret. Similarly, there are growing surgical treatment options, but conservative therapy remains the mainstay for most patients. A structured, collaborative model is essential for high-quality, patient-centered lymphedema care. Establishing multidisciplinary lymphedema centers can enhance outcomes, reduce delays, and promote innovation in treatment strategies.

ObjectiveThe incidence of lipedema is poorly described due to its confusion with lymphedema. Patient education is crucial for treatment and prevention strategies but also for improving healthcare outcomes. This study assessed and compared the quality of English and Spanish online resources for patients suffering from lipedema using a multimetric approach.MethodsA deidentified Google search using the terms "lipedema" and "lipedema español" was conducted. The first 10 academic/organizational websites in each language were selected. Quality assessment was performed using the Patient Education and Materials Assessment Tool (PEMAT), Cultural Sensitivity Assessment Tool (CSAT), Simple Measure of Gobbledygook (SMOG), and facticity criteria to evaluate understandability and actionability, cultural sensitivity, readability, and factual quality, respectively.ResultsEnglish webpages scored 73.70% for understandability and 35.0% for actionability, while Spanish webpages scored 75.05% and 21.0%, respectively; no significant differences were found between languages in understandability (p = .970) and actionability (p = .895). A significantly higher proportion of Spanish resources was found to be culturally sensible than English resources (90% vs 70%; p < .001). However, no significant differences were found in the cultural sensitivity score (English 2.87 vs Spanish 3.01; p = .677). The grade reading level for Spanish materials was significantly lower compared to English materials (11.08 vs 13.45; p = .006). Factual quality was low across both languages according to the facticity framework, though English materials scored higher than Spanish (2.20 vs 1.00; p = .051).ConclusionOur results suggest that online English and Spanish materials on lipedema have inadequate actionability, facticity, and reading grade levels for patients. Nonetheless, the levels of understandability and cultural sensitivity are acceptable. Enhancing the quality of online health literature for lipedema patients presents an opportunity to alleviate psychosocial burdens and address misconceptions.

PURPOSE: There are limited existing data on the lymphatic anatomy of patients with primary lymphedema (LED), which is caused by aberrant development of lymphatic channels. In addition, there is a paucity of contemporary studies that use groin intranodal lymphangiography (IL) to evaluate LED anatomy. The purpose of this retrospective observational study was to better delineate the disease process and anatomy of primary LED using groin IL.

MATERIALS AND METHODS: We identified common groin IL findings in a cohort of 17 primary LED patients performed between 1/1/2017 and 1/31/2022 at a single institution. These patients were clinically determined to have primary lymphedema and demonstrated associated findings on lower extremity MR and lymphoscintigraphy.

RESULTS: Ten patients (59%) demonstrated irregular lymph node morphology or a paucity of lymph nodes on the more symptomatic laterality. Eight patients (47%) demonstrated lymphovenous shunting from pre-existing anastomoses between the lymphatic and venous systems. Eight patients (47%) demonstrated passage of contrast past midline to the contralateral lymphatics. Finally, 12 patients (71%) failed to opacify the cisterna chyli and thoracic duct on their initial lymphangiograms. Delayed computed tomography of 3 patients showed eventual central lymphatic opacification up to the renal veins, but none of these patients showed central lymphatic opacification to the thorax.

CONCLUSION: This descriptive, exploratory study demonstrates common central groin IL findings in primary LED to highlight patterns interventional radiologists should identify and report when addressing primary LED.

BACKGROUND: Recent advances in breast cancer have progressed toward less aggressive axillary surgery. However, axillary lymph node dissection (ALND) remains necessary in specific cases and can increase the risk of lymphedema. Performing ALND with immediate lymphatic reconstruction (ILR) can help lower this risk. This report outlines the implementation of an Axillary Surgery Referral Program (ASRP) to broaden access to ILR, providing insights for institutions considering similar initiatives.

METHODS: A retrospective study analyzed patients referred to the ASRP at Beth Israel Deaconess Medical Center (BIDMC) between 6 January 2017 and 10 December 2022. Patients were identified from a prospective registry, with data subsequently extracted from electronic medical records. This analysis specifically centered on patients referred from external institutions to undergo ALND with ILR.

RESULTS: The program received referrals for 131 patients from institutions across five different states. Annual referrals steadily increased over time. The primary indication for referral was residual axillary disease after neoadjuvant chemotherapy (41.2%). Among the referrals, 20 patients (15.3%) no longer required ALND due to axillary pathologic complete response to neoadjuvant therapy. Care coordination played a crucial role in streamlining the patient care process for both efficiency and effectiveness.

CONCLUSION: The ASRP expands access to ILR for patients with breast cancer, the majority referred for surgical management of residual disease after chemotherapy. The program provides a model for health care institutions aiming to establish similar specialized referral services. Continued program evaluation will be instrumental in refining axillary surgery referral practices and ensuring optimal patient care.

Lymphedema has traditionally been underappreciated by the healthcare community. Understanding of the underlying pathophysiology and treatments beyond compression have been limited until recently. Increased investigation has demonstrated the key role of inflammation and resultant fibrosis and adipose deposition leading to the clinical sequelae and associated reduction in quality of life with lymphedema. New imaging techniques including magnetic resonance imaging (MRI), indocyanine green lymphography, and high-frequency ultrasound offer improved resolution and understanding of lymphatic anatomy and flow. Nonsurgical therapy with compression, exercise, and weight loss remains the mainstay of therapy, but growing surgical options show promise. Physiologic procedures (lymphovenous anastomosis and vascularized lymph node transfers) improve lymphatic flow in the diseased limb and may reduce edema and the burden of compression. Debulking, primarily with liposuction to remove the adipose deposition that has accumulated, results in a dramatic decrease in limb girth in appropriately selected patients. Though early, there are also exciting developments of potential therapeutic targets tackling the underlying drivers of the disease. Multidisciplinary teams have developed to offer the full breadth of evaluation and current management, but the development of a greater understanding and availability of therapies is needed to ensure patients with lymphedema have greater opportunity for optimal care.

Piezo1 regulates multiple aspects of the vascular system by converting mechanical signals generated by fluid flow into biological processes. Here, we find that Piezo1 is necessary for the proper development and function of meningeal lymphatic vessels and that activating Piezo1 through transgenic overexpression or treatment with the chemical agonist Yoda1 is sufficient to increase cerebrospinal fluid (CSF) outflow by improving lymphatic absorption and transport. The abnormal accumulation of CSF, which often leads to hydrocephalus and ventriculomegaly, currently lacks effective treatments. We discovered that meningeal lymphatics in mouse models of Down syndrome were incompletely developed and abnormally formed. Selective overexpression of Piezo1 in lymphatics or systemic administration of Yoda1 in mice with hydrocephalus or Down syndrome resulted in a notable decrease in pathological CSF accumulation, ventricular enlargement and other associated disease symptoms. Together, our study highlights the importance of Piezo1-mediated lymphatic mechanotransduction in maintaining brain fluid drainage and identifies Piezo1 as a promising therapeutic target for treating excessive CSF accumulation and ventricular enlargement.

BACKGROUND:  While substantial anatomical study has been pursued throughout the human body, anatomical study of the human lymphatic system remains in its infancy. For microsurgeons specializing in lymphatic surgery, a better command of lymphatic anatomy is needed to further our ability to offer surgical interventions with precision. In an effort to facilitate the dissemination and advancement of human lymphatic anatomy knowledge, our teams worked together to create a map. The aim of this paper is to present our experience in mapping the anatomy of the human lymphatic system.

METHODS:  Three steps were followed to develop a modern map of the human lymphatic system: (1) identifying our source material, which was "Anatomy of the human lymphatic system," published by Rouvière and Tobias (1938), (2) choosing a modern platform, the Miro Mind Map software, to integrate the source material, and (3) transitioning our modern platform into The Human BioMolecular Atlas Program (HuBMAP).

RESULTS:  The map of lymphatic anatomy based on the Rouvière textbook contained over 900 data points. Specifically, the map contained 404 channels, pathways, or trunks and 309 lymph node groups. Additionally, lymphatic drainage from 165 distinct anatomical regions were identified and integrated into the map. The map is being integrated into HuBMAP by creating a standard data format called an Anatomical Structures, Cell Types, plus Biomarkers table for the lymphatic vasculature, which is currently in the process of construction.

CONCLUSION:  Through a collaborative effort, we have developed a unified and centralized source for lymphatic anatomy knowledge available to the entire scientific community. We believe this resource will ultimately advance our knowledge of human lymphatic anatomy while simultaneously highlighting gaps for future research. Advancements in lymphatic anatomy knowledge will be critical for lymphatic surgeons to further refine surgical indications and operative approaches.