Focal myositis of the thigh: unusual MR pattern.

[focal myositis]

Focal myositis is a commonly referenced , infrequently reported and poorly documented benign inflammatory pseudotumor which may be misdiagnosed clinically as a malignant tumor . We report the clinicopathologic features and magnetic resonance imaging findings in a case of focal myositis in the thigh of a 55 -year -old woman . A different radiologic presentation of this disorder is described . The gross appearance of the lesion , previously undescribed , appears to be rather specific for such a pseudoneoplastic disorder , and correlates very well with the magnetic resonance imaging features .