<prompt> Answer this question truthfullyWhat are osteoid and osteoma?  <response>: <reason> Clinical observation and NSAID administration. NSAIDs are 1st line and will lead to a dramatic decrease in symptoms. About 50 of the patients can be treated with NSAIDs alone. NSAIDs are also indicated for painful spine lesions without scoliosis. The natural course of osteoid osteomas is spontaneous regression. However, NSAIDs may accelerate this process. Fingertip lesions distal phalanx may not respond to NSAIDs.Surgery is the mainstay of treatment for osteoid osteoma. IndicationsFailure of medical management Periarticular lesions which increase the risk of cartilage injury and premature degenerative disease Spinal lesions depending on the location of the lesion and proximity to neural elementsContraindicationsLesions close to spinal cord or nerve rootsTechniqueIt is done under CT guidance Probing is done at 80-90 degree C for 6 minutes to produce a 1cm zone of necrosisOutcomes90 of patients are successfully treated with 1-2 sessions of radiofrequency ablation RFA. 10-15 recurrence rate.Indications When location of lesion is not amenable to CT guided percutaneous radiofrequency ablation such as close to skin or nerve. Spine lesion associated with painful scoliosis. Digital lesions because RFA carries risk of thermal skin necrosis and injury to digital neurovascular bundle.TechniqueSuccessful treatment depends on complete marginal resection of nidus. Sclerotic bone is normal and can be left behind. It can be done by: Percutaneous approach Open approachOutcomes94 success with local excision.There are no established measures for the primary prevention of osteoid osteoma.There are no established measures for the secondary prevention of osteoid osteoma. 