[Non-bacterial chronic osteomyelitis: Experience in a tertiary hospital]. / Osteomielitis crónica no bacteriana: experiencia en un hospital terciario.

INTRODUCTION: Non-bacterial chronic osteomyelitis (NBCO) is an autoinflammatory disease that presents with recurrent bouts of bone inflammation in the absence of microbiological isolation. It is a diagnosis of exclusion. Its treatment was classically based on the use of non-steroidal anti-inflammatory drugs (NSAIDs) and corticosteroids, although nowadays bisphosphonates or anti-tumour necrosis factor-α (anti-TNF) drugs are frequently used with good results. The objective of the study is to describe our experience in the diagnosis and treatment of patients with NBCO. PATIENTS AND METHODS: Retrospective chart review of patients with NBCO followed up in a tertiary centre between 2008 and 2015. RESULTS: A total of 7 patients with NBCO were recorded. Four were female and the median age was 10 years (IQR 2). The most common complaint was pain that interfered with sleep in 5 of the patients. Six patients had multifocal lesions at diagnosis. Bone biopsy demonstrated neutrophilic or lymphocytic infiltration and sclerosis in 6 patients. Four patients received antibiotics and NSAIDs without clinical response. Five received a short course of prednisone with an adequate control of symptoms, but only one of them maintained remission after corticosteroid suspension. Five patients received bisphosphonates with disease remission in 3 of them. The other 2 showed an inadequate response to pamidronate and were started on anti-TNF therapy (etanercept, infliximab or adalimumab), remaining asymptomatic at present. CONCLUSIONS: Our series, although limited, confirms the effectiveness and safety of bisphosphonate and anti-TNF therapy for children with NBCO.

[Burkitt's lymphoma presenting as an intermittent limp]. / Cojera como forma de debut de un linfoma Burkitt.

Musculoskeletal pain is a frequent complaint in pediatrics usually related to benign conditions. However, it may also represent the initial symptom of serious diseases such as infections, malignancies or orthopedic emergencies. We present the case of a child diagnosed with Burkitt's lymphoma whose initial presentation was a limp. This is, to the best of our knowledge, the first case reported in the literature with this type of debut. This case illustrates the importance of including neoplasms in the differential diagnosis of atypical musculoskeletal pain, since early diagnosis can significantly improve their prognosis.