Ann Rehabil Med.  2011 Dec;35(6):944-948. 10.5535/arm.2011.35.6.944.

Focal Myositis of Unilateral Leg

• Jun J
• Im S
• Park JH
• Yoo SH
• Park GY

• KMID: 2266823
• DOI: http://doi.org/10.5535/arm.2011.35.6.944

Abstract

Focal myositis is a rare, benign inflammatory pseudotumor of the skeletal muscle of unknown etiology. In Korea, there is no case report of focal myositis, which is not combined with connective tissue disease. We present an unusual case of focal myositis with ankle contracture, involving more than two muscles. A 26-year-old man visited our clinic complaining of right ankle contracture and leg muscle pain. Physical examination revealed no muscle weakness or any other neurological abnormality. T2-weighted magnetic resonance imaging of the right leg demonstrated diffuse high signal intensity of the right gastrocnemius, flexor digitorum longus, and tibialis anterior muscles. Needle electromyography showed profuse denervation potentials with motor unit action potentials of short duration and small amplitude from the involved muscles. All these findings suggested a diagnosis of focal inflammatory myositis and the patient was put under oral prednisolone and physical therapy.

Keyword

Myositis; Ankle; Contracture

MeSH Terms

Action Potentials
Adult
Animals
Ankle
Connective Tissue Diseases
Contracture
Denervation
Electromyography
Granuloma, Plasma Cell
Humans
Korea
Leg
Magnetic Resonance Imaging
Muscle Weakness
Muscle, Skeletal
Muscles
Myositis
Needles
Physical Examination
Prednisolone
Prednisolone

Figure

• 

  Fig. 1 Results of right leg MRI. A1 and A2 display Sagittal T2-weighted images (A1 and A2), transverse T2-weighted image (B) and T1-weighted image (C) demonstrates diffuse high signal intensities of the right gastrocnemius (A with arrow), flexor digitorum longus (B with arrow), tibialis anterior (C with arrow) muscles, and edematous changes of the subcutaneous tissue.

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