Computed tomography of osteoid osteoma

Computed tomography revealed a radiolucent nidus with a surrounding zone of osteosclerosis in 17 patients with osteoid osteoma. Plain films did not reveal any abnormality in 5 patients. Conventional tomography was negative in 3 patients. Computed tomography is the modality of choice for detection of osteoid osteoma when the lesion is deep-seated or when it occurs in complex anatomic regions with curvilinear and overlapping surfaces, such as acetabulum, knee, and spine.     

Diagnosis of osteoid osteoma using computed tomography

Osteoid osteoma is a benign lesion of bone generally diagnosed using conventional radiography or conventional tomography. Computed tomography can be used in difficult cases to localize a clinically suspected lesion. In this report we present two patients in whom an osteoid osteoma was detected using computed tomographic scanning; in an additional patient computed tomography failed to localize a lesion, probably because the slice thickness was too great. Because the nidus of the lesion is small—generally several millimeters in diameter—accurate CT localization requires that narrowly collimated, closely spaced sections be obtained.     

Imaging of osteoid osteoma by MR tomography

We report the demonstration of eight osteoid osteomas by means of magnetic resonance imaging (MRI). The nidus could be depicted showing intermediate signal intensity in T1-weighted and intermediate or increased signal intensity in T2-weighted sequences. It was embedded in thickened bone cortex, which demonstrated a signal-free zone. A different pattern was found in a subchondral osteoid osteoma of the talar dome, in which neither nidus nor sclerotic margin could be delineated. MRI is a valuable diagnostic tool in osteoid osteomas and may provide important information in addition to conventional imaging methods.     

Value of x-ray computed tomography in osteoid osteoma

Four cases of suspected osteoid osteoma were evaluated by computed tomography (CT). The authors relate the role of CT. As a key diagnostic tool: radionuclide imaging is helpful in directing subsequent CT scans, which allows the study of complex anatomical sites (spine) or the analysis of atypical lesions (invisible nidus, sclerosis or lytic lesions, double nidus...). CT provides the surgeon with the exact location and extent of the lesion, and thus, CT may allow a more limited surgical resection of the involved bone.     

The role of computerized tomography in the diagnosis of osteoid osteoma

Radiological diagnosis of osteoid-osteoma is based upon conventional radiographic techniques, i.e. plain film and tomography, scintigraphy and Computed Tomography (CT). The authors report on the use of CT in 13 patients affected by histologically verified osteoid-osteoma, in different locations, as related to their main clinical and epidemiological signs. A comparison is made of the diagnostic contribution of the different techniques, including scintigraphy and tomography, when available. CT results were evaluated referring to fundamental semiologic elements, such as the presence of the nidus--with or without calcifications--of perilesional sclerosis, hyperostosis and periosteosis. As a rule, we can affirm that CT allows a better spatial location in the metaphysodiaphyso-epiphyseal areas, the only exception being represented by location in the metacarpal and phalangeal bones, which are better evaluated in the axial plane due to their thinness. CT is otherwise indispensable for a correct evaluation of the posterior vertebral arch.     

Bone scintigraphy as a guide to the diagnosis of osteoid osteoma.

This report describes one case in which bone scintigraphy was helpful in establishing the diagnosis of osteoid osteoma and presents three other cases in which increased accumulation of 99mmTc-EHDP was found at the side of the osteoid osteoma. The study contributes to the observation by others that the osteoid osteoma occurs as a scintigraphic 'hotspot'. It is concluded that the diagnostic delay of the osteoid osteoma can be shortened when bone scintigraphy is performed more often and at an earlier stage in patients with unexplained bone pain or with a clinical history that leads to the suspicion of the presence of an osteoid osteoma.     

骨样骨瘤全身骨显像和SPECT/CT显像的图像特征分析

目的分析骨样骨瘤全身骨显像(WBS)和SPECT/CT显像的图像特征。方法回顾性纳入2010年1月至2018年12月间西南医科大学附属医院经病理证实且以局部疼痛为主要表现的70例骨样骨瘤患者(男50例,女20例,年龄4~66岁),分析患者99Tcm-亚甲基二膦酸盐(MDP)平面显像及SPECT/CT显像的图像特点。结果WBS联合SPECT/CT显像发现70个病灶,以股骨(37.1%,26/70)和胫骨(35.7%,25/70)病灶多见;56例行三时相骨显像的患者病灶与健侧放射性比值(T/NT)为3.7±1.2。WBS示病灶摄取呈圆形(或类圆形)者48个(68.6%,48/70),呈梭形者21个(30.0%,21/70),不规则形状者1个(1.4%,1/70);SPECT/CT显像示病灶摄取呈圆形(或类圆形)者69个(98.6%,69/70),不规则形状者1个(1.4%,1/70)。WBS中表现为"双灰度征"的病灶有48个(68.6%,48/70);而SPECT/CT显像示59个(84.3%,59/70)病灶表现为"双灰度征"。SPECT/CT显像示59个(84.3%,59/70)病灶有瘤巢,27个(38.6%,27/70)病灶出现钙化或骨化(即"靶征")。结论骨样骨瘤的典型WBS及SPECT/CT显像征象包括"双灰度征"、瘤巢及"靶征"等,这些征象有助于骨样骨瘤的诊断。     

Vertebral osteoid osteoma. Diagnostic value of x-ray computed tomography

An update review of diagnosis of vertebral osteoid osteoma based on findings in four cases and the documented data accords a predominant place to scan imaging. Computed tomography guided by scintigraphy is the only examination able to determine the site of the lesion with precision.     

Difficulties in the diagnosis of osteoid osteoma

The difficulties arising in diagnosing osteoidosteoma are demonstrated by means of 30 surgically treated cases and the results are compared with those available from the literature. The value of bone scintigraphy and of tomography within the framework of a diagnostic concept is underlined. Diagnosis is confirmed and treatment is effected by the successful surgical removal of the nidus.     

Subperiosteal osteoid osteoma of the talus

We report three patients with subperiosteal osteoid osteoma of the talus. All showed an erosion of the dorsal surface of the talus with medullary bone sclerosis. Adjacent paraosseous soft tissue calcification was seen in two lesions. Computed tomography demonstrated the nidus of the osteoid osteoma in two cases.     

骨样骨瘤的影像学诊断

目的 分析骨样骨瘤的X线、CT和MRI表现。方法 搜集经手术病理证实的骨样骨瘤48例，其中男33例，女15例。所有病例均行X线检查，其中同时行CT检查者32例，行MR检查者10例，3种检查方法都进行者8例。分析骨样骨瘤在X线、CT和MRI上的表现及其对瘤巢和瘤巢周围改变的显示能力。结果 48例病灶均表现为一圆形或卵圆形的透亮区，直径为0．4～1．7cm，平均9．7cm，其周围有不同程度的骨质硬化。10例行MR检查者均可见瘤巢周围的软组织、骨髓水肿或关节腔积液。48例X线平片仅37例显示瘤巢，32例行CT检查者均清楚显示瘤巢，X线和CT对瘤巢显示率分别为77％(37／48)和100％(32／32)。10例MR检查者均可作出正确诊断，其中8例能直接判断出瘤巢，另2例需对照平片或CT才能肯定。结论 瘤巢是确诊骨样骨瘤的关键，X线平片仍然是诊断骨样骨瘤的重要检查方法，CT是显示瘤巢的最佳方法，MRI能敏感地显示瘤巢周围骨髓内及软组织的炎性水肿，但可能造成误诊，结合平片或CT可作出准确诊断。     

Familial occurrence of osteoid osteoma

Familial occurrence of osteoid osteoma is an exceedingly rare event. This paper describes the second report of this event, where two siblings presented with this lesion in the same location, the proximal left femur. They both presented at 6 years of age, but 3 years apart.