Diagnostics (Sep 2024)

Characterizing Normal Upper Extremity Lymphatic Flow with <sup>99m</sup>Tc In-House Dextran: A Retrospective Study

  • Wiroj Katiyarangsan,
  • Putthiporn Charoenphun,
  • Krisanat Chuamsaamarkkee,
  • Suchawadee Musikarat,
  • Kidakorn Kiranantawat,
  • Chaninart Sakulpisuti,
  • Kanungnij Thamnirat,
  • Arpakorn Kositwattanarerk,
  • Chanika Sritara,
  • Wichana Chamroonrat

DOI
https://doi.org/10.3390/diagnostics14171960
Journal volume & issue
Vol. 14, no. 17
p. 1960

Abstract

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Lymphoscintigraphy evaluates the lymphatic system using radiocolloid compounds like 99mTc-sulfur colloid and 99mTc-nanocolloid, which vary in particle size and distribution timing. A local in-house Dextran kit (15–40 nm) was developed in 2005 and began clinical use in 2008 to localize sentinel lymph nodes; diagnose lymphedema; and detect lymphatic leakage. The normal drainage pattern remains unexplored. We retrospectively analyzed 84 upper extremity lymphoscintigraphies from 2008 to 2021. 99mTc in-house Dextran was intradermally injected into both hands, followed by whole-body imaging at specified intervals (≤15 min; 16–30 min; 31–45 min; 46–60 min), with some receiving delayed imaging. Visual and quantitative analyses recorded axillary and forearm lymph nodes and liver, kidney, and urinary bladder activity. Results showed 92% (77/84) upper extremity lymphatic tract visualization within 45 min. Axillary node detection rates increased from 46% (≤15 min) to 86% (46–60 min). Delayed imaging further revealed nodes. Epitrochlear or brachial node visualization was rare (4%, 3/84). Hepatic, renal, and urinary bladder activity was noted in 54%, 71%, and 93% at 1 h, respectively. The axillary node uptake ratio was minimal (99mTc in-house Dextran, offering insights into its clinical application

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