Lymphedematous HIV-associated Kaposi's sarcoma

Area of Science:

• Oncology
• Dermatopathology
• Infectious Disease

Background:

• Advanced Kaposi sarcoma (KS) often co-occurs with chronic lymphedema (cLO).
• Histopathological features of lymphedematous KS and fibroma-like nodules are under-recognized.
• The study revisits the pathogenesis of fibroma-like nodules and cLO.

Purpose of the Study:

• To assess the clinicopathological spectrum of lymphedematous KS.
• To identify diagnostic difficulties associated with cLO in KS.
• To characterize fibroma-like nodules and their relationship with cLO and KS.

Main Methods:

• Prospective clinicopathological study of biopsies from patients with lymphedematous KS.
• Evaluation of 74 biopsies from 41 patients over 17 months.
• Analysis of histopathological features, including KS morphology, fibroma-like nodules, and signs of cLO.

Main Results:

• Poor clinicopathological correlation of KS stage was noted in 14 biopsies.
• KS or fibroma-like morphology with adjacent cLO observed in 23 biopsies.
• Smaller fibroma-like nodules lacked KS cells, while larger ones (>5 mm) showed KS spindle cell proliferation.

Conclusions:

• Chronic lymphedema (cLO) can mask KS and affect clinicopathological correlation.
• Fibroma-like nodules may be a manifestation of cLO with potential to develop KS characteristics.
• Lymphatic/venous obstruction, fluid accumulation, hemosiderin, and infection contribute to cLO progression.