Rapidly progressive polyostotic eosinophilic granuloma involving spine: a case report.

17 yrs. old boy presented with low back pain and progressive deformity with no history of trauma or tuberculosis. Clinically there was tender knuckle formation at L2 level. X-rays showed vertebra plana (concentric collapse) at L2 level along with skull involvement. While being investigated patient developed partial collapse at L3 level and pelvis involvement within a week. On biopsy from L3 vertebra the lesion was found to be eosinophilic granuloma. This is a case report of a rare instance in which acute progression of eosinophilic granuloma occurred involving multiple skeletal sites in an adult.