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[Muscle-localized tumorlike polyarteritis nodosa].

I Hiar¹, S Ansart, A Volant

¹Service de médecine interne et maladies infectieuses, CHU La Cavale Blanche, boulevard Tanguy-Prigent, 29609 Brest, France.

La Revue De Medecine Interne

|October 16, 2002

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Localized tumorlike polyarteritis nodosa in forearm muscles is rare. This muscle-localized form of polyarteritis nodosa (PAN) has a benign course and responds well to corticosteroids, though relapses can occur.

Area of Science:

Rheumatology
Pathology
Oncology

Background:

Systemic vasculitis rarely presents as tumorlike lesions, predominantly affecting the genitourinary system and breast.
Muscle-localized tumorlike periarteritis nodosa (PAN) is exceptionally uncommon.

Observation:

This report details a rare case of localized, tumorlike polyarteritis nodosa affecting the forearm muscles of a 90-year-old female patient.
The clinical presentation mimicked a neoplastic mass.

Findings:

Review of similar cases indicates that muscle-localized PAN follows a generally benign clinical course.
Prompt response to corticosteroid monotherapy is characteristic of this localized form.
Potential for disease relapse exists despite initial treatment efficacy.

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Implications:

Highlights the importance of considering vasculitis in the differential diagnosis of tumorlike lesions, even within muscle tissue.
Suggests corticosteroids as a primary treatment modality for localized muscle PAN.
Emphasizes the need for long-term monitoring due to the possibility of relapses.