Aneurysmal bone cyst of the orbit

Aneurysmal bone cysts of the skull are rare, and orbital involvement of these cysts is even less frequent. We present CT, MR imaging, and histopathologic findings of an aneurysmal bone cyst of the orbit in a 13-year-old female adolescent. The tumor mainly involved the frontal bone. MR imaging findings of the aneurysmal bone cyst of the skull were highly suggestive of the diagnosis.     

A patient with swelling of the eyelid: ancient schwannoma of the supraorbital nerve (2010:6b)

We present a case of swelling of the eyelid and supraorbital anesthesia caused by an intraorbital tumor. The differential diagnosis based on imaging consisted of aneurysmal bone cyst, schwannoma, neurofibroma, dermoid cyst, and cavernous hemangioma. The surgical and pathological diagnosis was an ancient schwannoma of the orbit, a rare entity.     

Orbital involvement by multiple myeloma: case report

A case of orbital myeloma in a patient with myelomatosis is discussed. Extraskeletal spread to the orbit has rarely been reported. In a patient with proptosis and known multiple myeloma, an orbital mass can be presumed to be orbital involvement by myeloma.     

颅骨动脉瘤样骨囊肿的影像学表现

目的：探讨颅骨动脉瘤样骨囊肿的影像学表现，提高对颅骨动脉瘤样骨囊肿的认识。资料与方法：搜集经手术病理证实的4例颅骨动脉瘤样骨囊肿，全部病例均作了CT平扫与MRI检查，其中1例摄有颅骨平片，1例MR／增强扫描，1例DSA检查。结果：4例颅骨动脉瘤样骨囊肿中，1例位于左蝶骨嵴和左眶骨处，2例位于左颞骨。1例位于右额骨。CT上均表现为不同程度的膨胀性吹气球样溶骨破坏区，密度不均匀；MRI示有出血、囊变及液面，T1WI和R2WI上呈混杂信号，1例增强后示肿瘤实质和邻近脑膜强化；血管造影示血管有推移改变。结论：颅骨动脉瘤样骨囊肿的影像学表现有一定的特征性，CT与MRI相结合能提示诊断，并有助于评价周围结构。     

Chronic hematic cyst of the orbit (orbital subperiosteal hematoma)

A case of chronic hematic cyst of the orbit which caused unilateral globe displacement with painful diplopia is described in a 72-year-old man. CT scans showed an extraconal soft tissue mass located between the orbital roof and the superior rectus muscle with a bone lysis. Characteristic appearance on MRI (benign signs, subperiosteal localization of the hematoma) has been confirmed by removal surgery. Chronic hematic cyst of the orbit is uncommon and MRI is helpful to establish this diagnostic.     

Aneurysmal bone cyst of the orbit: a case of rare location and review of the literature

Aneurysmal bone cysts (ABCs) are benign fibrosseous lesions, very rarely occurring in the orbit. Seventeen cases of ABCs involving the orbit were reported in the literature. MRI pictures of a 7-year-old female patient with ABC involving the orbit are presented here. The clinical findings were left-sided painless proptosis, diplopia, papilledema and partial loss of the vision. MRI study showed a well-circumscribed mutliloculated expansile lesion of the orbital roof. We additionally make a review of the literature for these rare lesions.     

Fatal ethibloc embolization of vertebrobasilar system following percutaneous injection into aneurysmal bone cyst of the second cervical vertebra

A 4-year-old boy developed progressive neck pain and an expansile osteogenic lesion of C2; the diagnosis was an aneurysmal bone cyst. An image-guided biopsy with 3D CT planning was performed followed by Ethibloc injection into the aneurysmal bone cyst. Subsequent CT and MR images demonstrated embolization material in the vertebrobasilar system, and the patient died of brain stem and cerebellar infarction 23 hours after the intervention. The course of events and technical considerations are discussed.     

Metachronous aneurysmal bone cysts with involvement of the humerus and the thoracic vertebrae

Metachronous aneurysmal bone cysts are rare. We report on a 32-year-old man who presented with an aneurysmal bone cyst of the thoracic spine 15 years subsequent to diagnosis of aneurysmal bone cyst of the humerus.     

原发性与继发性动脉瘤样骨囊肿CT表现

目的评价CT对诊断与鉴别原发性与继发性动脉瘤样骨囊肿的价值。方法回顾性分析9例经手术病理证实原发性与继发性动脉瘤样骨囊肿的CT征象,并进行献复习。结果9例患中骨皮质缺损征象出现率(67％)高于“液一液平面”出现率(44％)。继发性动脉瘤样骨囊肿骨嵴明显粗大,可构成分房。9例病灶内呈不均匀软组织密度,增强后强化明显。结论CT检查有助于动脉瘤样骨囊肿早期定性诊断,并有助于鉴别原发性与继发性病灶。     

Case report 748

A case of chondroblastoma associated with an aneurysmal bone cyst has been described. The radiographic appearance of the lesion understandably reflects the combined features of both tumors. Up to one-half of all cases of aneurysmal bone cysts are found in association with other tumors, benign or malignant, and up to 15% of chondroblastomas are combined with an aneurysmal bone cyst (4).     

动脉瘤样骨囊肿的CT及MRI诊断(附21例报告)

目的分析动脉瘤样骨囊肿的CT及MR I表现,评价其影像学诊断价值。方法回顾分析21例经手术或穿刺证实的动脉瘤样骨囊肿的CT及MR I表现。结果病变在CT上有16例可见明显液-液平面,其上缘CT值低于下部,其中继发性动脉瘤样骨囊肿可见明显软组织肿块,而MR I图像上除1例继发性动脉瘤样骨囊肿未见明显液-液平面以外,其它20例均有明显液-液平面。且继发性动脉瘤样骨囊肿的软组织肿块显示得更加清楚。结论动脉瘤样骨囊肿大部分病例在CT和MR I上出现有液-液平面,具有一定特征性,但不是惟一性。     

Primary and secondary aneurysmal bone cyst: a radiological study of 75 cases

Radiological findings in 75 cases of aneurysmal bone cyst were analyzed. Sixty-five per cent were primary or simple and 35% were secondary, the aneurysmal bone cyst being combined with other osseous lesions. A primary aneurysmal bone cyst can be diagnosed with a high degree of certainty, but only 20% of secondary forms had the radiological appearance of aneurysmal bone cyst; in the other 80% the associated lesion dominated the radiological picture, particularly when it was malignant. In the secondary form a small biopsy specimen may show the features of aneurysmal bone cyst only; without radiological assistance a concomitant malignant lesion may be missed. Therefore, there must be close collaboration between the radiologist and and the pathologist.     

Diagnosis of aneurysmal bone cyst of the mandible. A report of two cases with emphasis on scintigraphic approaches

Aneurysmal bone cyst is rarely found in the mandible, and roentgenographic diagnosis of this condition is not easily made. In this report, the diagnostic value of bone scintigraphy and radionuclide angiography and CT imaging in two cases of aneurysmal bone cyst of the mandible are discussed. Bone scintigraphy with Tc-99m MDP demonstrated ring-like or doughnut-pattern accumulation of radioactivity, which corresponded to the expansile character of the bony lesion. The accumulation of radioactivity was intensive in the peripheral region despite the fact that the lesion was benign. Furthermore, the central rarefaction showed that the lesion was cystic. Radionuclide angiography with Tc-99m HSA, including blood pool scan, did not detect radioactive concentration. Thus bone scintigraphy and radionuclide angiography were found to be essential in the differential diagnosis of aneurysmal bone cyst from other forms of tumor, especially hypervascularized tumor and central hemangioma of the mandible.     

变应性真菌性鼻窦炎累及眼部的CT诊断

目的 探讨变应性真菌性鼻窦炎累及眼部的CT表现。资料与方法回顾性分析6例经病理组织学证实的变应性真菌性鼻窦炎，均出现眼部症状，包括突眼5例，眼球移位4例，视力减退3例；鼻部主要症状为奶酪状黏涕、鼻塞。结果6例变应性真菌性鼻窦炎均累及双侧多个鼻窦。CT平扫示受累鼻窦窦腔充满软组织影，伴有多发条状、葡行性或斑片状高密度影(软组织窗)，边界清楚，也可伴有磨玻璃状高密度影(骨窗)，边界较模糊；鼻窦膨胀．窦壁骨质变形、变薄、连续中断。病变累及眼眶，4例侵犯眶内壁，1例侵犯眶上壁，1例同时侵犯眶内、上壁．与邻近眼外肌分界不清；眶尖容积变小2例，6例眼球均不同程度突出。结论双侧鼻窦充满软组织影，伴有条状或葡行高密度影是诊断本病的特征性CT征象，根据此征象可提出本病的诊断；本病进展期常侵犯眼眶，有时患者可能以眼部症状首先就诊，应引起临床及影像科医师的重视。     

Leptomeningeal cyst of the orbit presenting with pulsatile exophthalmos

The case of a 64-year-old man who presented with unilateral pulsatile exophthalmos is described. A defect in the supero-medial wall of the orbit and an extraconal low density mass were demonstrated by orbital radiographs and CT. Positive contrast CT cisternography confirmed the diagnosis of a leptomeningeal cyst.     

血管异常扩张性骨囊肿——对动脉瘤样骨囊肿命名及归属的商榷

本文报告11例血管异常扩张性骨囊肿,其病理特点是静脉动脉异常扩张引起的骨膨胀,原命名为动脉瘤样骨囊肿并不符合其病理改变。并对其归属及分类进行了讨论。     

Juxtaepiphyseal aneurysmal bone cyst

Nine cases of aneurysmal bone cyst arising in juxtaepiphyseal locations with gross invasion of the adjacent growth plate are reported. In five of these patients an abnormality of growth, due to premature fusion of the affected growth plate, ultimately developed. Treatment of these lesions should attempt to avoid this complication, which appears to be more common than has been appeaciated in the past. These nine cases represent 23% of 39 cases of aneurysmal bone cyst occurring in a long bone adjacent to an open epiphyseal plate. This series was extrapolated from a total of 198 cases of aneurysmal bone cyst in the files of the Istituto Ortopedico Rizzoli, Bologna, Italy.     

Aneurysmal bone cyst of the temporal bone: MR findings.

MR findings in a case of aneurysmal bone cyst of the temporal bone are described. MR can suggest the diagnosis of aneurysmal bone cyst and also give ancillary information that is helpful for surgical treatment.     

Chondroblastoma of the patella with a secondary aneurysmal bone cyst

A case of chondroblastoma of the patella combined with an aneurysmal bone cyst is presented. Chondroblastoma of the patella is an uncommon, benign neoplasm. On the other hand, secondary aneurysmal bone cyst is frequently associated with giant cell tumour of chondroblastoma. Received 15 July 1997; Revision received 6 November 1997; Accepted 13 November 1997     

Soft tissue aneurysmal bone cyst

A soft tissue aneurysmal bone cyst located in the right gluteus medius of a 21-year-old man is reported. On conventional radiography, the lesion demonstrated a spherically trabeculated mass with a calcific rim. On CT scan, it showed a well-organized peripheral calcification resembling a myositis ossificans. On MRI, it presented as a multilocular, cystic lesion with fluid-fluid levels. The lesion had no solid components except for intralesional septa. Although findings on imaging and histology were identical to those described in classical aneurysmal bone cyst, diagnosis was delayed because of lack of knowledge of this entity and its resemblance to the more familiar post-traumatic heterotopic ossification (myositis ossificans).