Eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan: muscle biopsy findings in 4 patients.

Hollander, D; Adelman, L S · Neurology · 1991

case_series · Level IV

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Abstract

Muscle biopsies of 4 patients with the eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan showed lymphocytic infiltrates with occasional eosinophils largely restricted to interstitial fibrous tissue and perivascular areas. There was inflammation and fibrosis of muscle spindle capsules in 3 patients. In the 2 sickest patients, there was profound muscle atrophy, affecting both muscle fiber types.

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