Abstract
Injection of high-viscosity fluids into subcutaneous tissues may lead to a granulomatous reaction called sclerosing lipogranuloma (SL). Poly-(d,l-lactide-co-glycolide) (PLG or PLGA) microspheres are used as vehicles for extended-release drugs. Here we describe the histopathologic features of a case of SL induced by exenatide extended-release injections, and the staining pattern of PLG microspheres and microsphere remnants with carbol fuchsin.
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