背景:磁共振成像(MRI),不涉及电离辐射,是诊断骨样骨瘤(OO)的首选成像方式,一种在儿童和年轻人中更常见的疾病。
目的:本研究旨在进行文献综述,并描述不同区域表现出不同放射学特征的患者OO病变的MRI表现。
方法:一项回顾性研究包括63例经MRI诊断为OO的患者,由两名盲放射科医生使用标准和动态对比增强MRI技术独立评估。排除7例先前活检的患者后,手术,或RFA,该研究包括56例患者,共57个病灶.
结果:在评估的57个病变中,50在很长的时间里,7在扁平的骨头里。一名患者在转子间区域内出现两个独立的nidi。大部分的病变,49(86%),是关节外的,8(14%)为关节内。45例(78.9%)患者病灶内病变,髓内5(8.8%),骨膜下5例(8.8%),和骨内膜2(3.5%)。平均眼窝直径为7.02±2.64mm(3-12.6mm)。68.4%(n=39)的病例存在中央钙化。对比度增强强度为90.5%,温和,为9.5%。病灶周围的反应性硬化严重(50.9%),中等(22.8%),温和(26.3%)。骨髓水肿严重(70.2%),中等(14.0%),温和(15.8%)。在所有病变的77.2%中发现软组织水肿。
结论:为了尽量减少诊断和治疗的延误,放射科医师应熟悉典型的OOMRI检查结果和可能被误认为其他疾病的非典型MRI检查结果.
BACKGROUND: Magnetic resonance imaging (MRI), which does not involve ionizing radiation, is the preferred imaging modality for diagnosing osteoid osteoma (OO), an ailment more common in children and young adults.
OBJECTIVE: This study aims to perform a literature review and delineate the MRI findings of OO lesions in patients exhibiting varying radiological features across different regions.
METHODS: A retrospective study included 63 patients diagnosed with OO through MRI, assessed independently by two blinded radiologists using both standard and dynamic contrast-enhanced MRI techniques. After excluding 7 patients with prior biopsy, surgery, or RFA, the study included 56 patients with 57 lesions.
RESULTS: Of 57 lesions evaluated, 50 were in long, and 7 in flat bones. One patient presented with two separate nidi within the intertrochanteric region. Most of the lesions, 49 (86%), were extra-articular, while 8 (14%) were intra-articular. The nidus was intracortical in 45 (78.9%) patients, intramedullary in 5 (8.8%), subperiosteal in 5 (8.8%), and endosteal in 2 (3.5%). Average nidus diameter was 7.02 ± 2.64 mm (3-12.6 mm). Central nidal calcification was present in 68.4% (n = 39) cases. Contrast enhancement was intense at 90.5%, moderate at 9.5%. Reactive sclerosis around the nidus was severe (50.9%), moderate (22.8%), and mild (26.3%). Bone marrow edema was severe (70.2%), moderate (14.0%), and mild (15.8%). Soft tissue edema was identified in 77.2% of all lesions.
CONCLUSIONS: To minimize delays in diagnosis and treatment, radiologists should become acquainted with the typical OO MRI findings and the atypical MRI findings that might be mistaken for other conditions.