macrophagic myofasciitis
MMF
Macrophagic myofasciitis (MMF) is a rare inflammatory myopathy characterized by accumulation of perifascicular macrophages without muscle fiber necrosis.
MMF is recognized as a possible reaction to intramuscular injections of aluminum-containing vaccines.
References
Gruis KL, Teener JW, Blaivas M. Pediatric macrophagic myofasciitis associated with motor delay. Clin Neuropathol. 2006 Jul-Aug;25(4):172-9. PMID: 16866298