Biopolymers: Histopathologic Case Series of Patients with Permanent Synthetic Fillers Presenting Chronic Granulomatous Reaction and Hypercalcemia.

Background: Biopolymers, which are diverse and permanent synthetic fillers, are nonbiocompatible allogeneic materials. Their implantation can result in clinical, radiological, and histopathological manifestations that contribute to our understanding of foreign-body-induced human adjuvant disease. Methods: We conducted a descriptive observational case series involving 20 patients who underwent open biopolymer removal surgery in the buttocks and lumbosacral regions using the Meticulous Approach Safer and Keeper technique, followed by gluteal reconstruction with autologous tissue. Histopathological analysis was performed. This study was conducted in Bogotá, Colombia, from 2020 to 2023. Results: Documented clinical records and histopathological analyses of the 20 patients revealed an inflammatory response that was initially considered healthy. Cytoplasmic vacuolization in reactive adipocytes was observed in all cases, meriting consideration in the differential diagnosis of liposarcoma and suggesting local aggressiveness. One patient showed a positive lymphocytic inflammatory response in the Alcian blue test. Hypercalcemia was present in 30% of the patients, elevated lactate dehydrogenase in 40%, and elevated parathyroid hormone levels in 15%. Conclusions: Surgeons should consider measuring lactate dehydrogenase, serum calcium, and parathyroid hormone levels to assess the severity and guide clinical practice. Secondary prevention through the open surgical removal of biopolymers is recommended.