[Coexistence of dermatomyositis and macrophagic myofasciitis]

An inflammatory myopathy, characterised by joint and muscle pain, chronic asthenia, with infiltration of peri-fascicular epimysium, perimysium and endomysium by cells of the macrophagic line, macrophagic myofasciitis is often associated with other, generally auto-immune, affections. However, the coexistence with another inflammatory myopathy is relatively rare.

A 29 year-old woman presented with 2 distinct inflammatory myopathies, a macrophagic myofasciitis and a dermatomyositis, which had appeared a few years after.

In the rare cases in which 2 inflammatory myopathies are combined, the precise relationship between them is unknown, an individual susceptibility to developing muscle diseases is suggested.