患者,女,30岁,腰骶部疼痛1年余,屈曲时加重。入院检查:发育正常,脊柱及四肢无畸形,局部无红肿,实验室检查:未见异常。X线检查:L5右侧下关节突骨质膨胀性硬化,密度不均,周围软组织未见肿胀。CT表现:L5右侧下关节突骨质膨胀性硬化,内呈小圆形透亮区,其内有小米粒致密影,病变累及同侧分椎板。手术所见:L5右侧下关节突肥大,骨质硬化,凿除肥大下关节突出部分,其骨肿块内有肉芽样组织,骨肿块形成骨巢,周边骨质硬化。病理诊断:L5右下关节突骨样骨瘤。 Patient, female, 30 years old, lumbosacral pain more than 1 year, increased flexion. Admission examination: normal development, spine and limbs without deformity, no local swelling, laboratory tests: no abnormalities. X-ray examination: L5 on the right side of the lower facet osteophyte expansion sclerosis, uneven density, no swelling around the soft tissue. CT manifestations: L5 right lower surface of the articular process of bone expansion and hardening sclerosis, showed a small circular translucent area, which has millet dense shadow, lesions involving the ipsilateral sublaminar. Surgical findings: L5 right inferior fascia suddenly hypertrophy, bone sclerosis, chiseling fat hypertrophy under the prominent part of the joint, the granuloma there are granulation tissue, bone mass formation of the nest, the surrounding bone sclerosis. Pathological diagnosis: L5 right lower quadrant osteoid osteoma.