Focal myositis associated with S-1 radiculopathy: report of two cases.
Two cases are described of pseudotumoral calf hypertrophy after laminectomy for a compressive S-1 radiculopathy. The serum creatine kinase (CK) level was normal or mildly elevated. T2-weighted magnetic resonance imaging (MRI) showed calf enlargement, with an increased signal of the medial head of the gastrocnemius muscle. Electromyography revealed fibrillation potentials and positive sharp waves, but no complex repetitive discharges in the affected gastrocnemius muscle, with motor unit potentials having mixed neurogenic and myopathic features. Muscle biopsy revealed a focal myositis associated with some features of denervation. A brief course of corticosteroids was followed by remission clinically and improvement in the MRI findings.
Service de Neuropathologie, Hôpital Neurologique, BP Lyon-Montchat, 69394 Lyon, France. nathalie.streichenberger@chu-lyon.fr
Nathalie
N
Streichenberger
David
D
Meyronet
Vincent
V
Fiere
Jean-François
JF
Pellissier
Philippe
P
Petiot
D000328:Adult; D005260:Female; D006801:Humans; D006984:Hypertrophy / Q000209:etiology* / Q000473:pathology* / Q000503:physiopathology; D007405:Intervertebral Disc Displacement / Q000150:complications / Q000503:physiopathology / Q000601:surgery; D007796:Laminectomy; D008279:Magnetic Resonance Imaging; D008297:Male; D009121:Muscle Denervation / Q000009:adverse effects; D018482:Muscle, Skeletal / Q000294:innervation / Q000473:pathology* / Q000503:physiopathology; D009220:Myositis / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D009431:Neural Conduction / Q000502:physiology; D011843:Radiculopathy / Q000150:complications* / Q000503:physiopathology / Q000601:surgery; D012447:Sacrum; D013127:Spinal Nerves / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D013979:Tibial Nerve / Q000503:physiopathology