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Successful treatment of erythema nodosum with salazosulfapyridine in a 9-year-old patient with chronic non-bacterial osteomyelitis.
Modern rheumatology case reports. 2024 April 11
We report a 9-year-old Japanese girl with chronic non-bacterial osteomyelitis (CNO) accompanied by recurrent erythema nodosum (EN) which was successfully treated with salazosulfapyridine (SASP). She was referred to our hospital because of recurrent erythema on her lower extremities and persistent knee and ankle arthralgia, which had been present for approximately one year. Although naproxen, a nonsteroidal anti-inflammatory drug (NSAID), was initiated, her symptoms frequently recurred. Magnetic resonance imaging demonstrated multiple distinct high-intensity signals in the talus bones suggestive of multiple bone edemas. Additionally, a histological examination of erythematous lesions was consistent with the histopathological findings of EN. She was diagnosed as having CNO complicated by EN, and received 250 mg/day of SASP as a second-line treatment, which showed partial response of both skin and bone lesions. Following increase in the dose of SASP to 500 mg/day resulted in complete remission of her skin and bone lesions. In conclusion, our findings suggest that SASP is effective not only for CNO bone lesions but also for EN. SASP could serve as a second-line therapeutic option at least for some cases of CNO complicated by EN refractory to NSAIDs.
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