[Garre's chronic sclerosing osteomyelitis with sacral involvement in a child].

We report the case of a 6 year old patient who started with abdominal pain and left sciatica, which did not improve after applying symptomatic treatment. A complete analytical and imaging study was performed, which showed a lesion in left S1 corresponding to Garrè's chronic diffuse sclerosing osteomyelitis. The diagnosis was confirmed by biopsy of the lesion. Treatment was established with corticosteroids and anti-inflammatory drugs, obtaining a clinical improvement, although in the follow-up imaging tests 2 years after the onset of the symptoms, the lesion persists but with a significant reduction in its size.