椎管内神经鞘瘤:MRI与病理对照

目的探讨椎管内神经鞘瘤的MR I表现以及与病理学之间的关系。方法回顾性分析经手术、病理证实的椎管内神经鞘瘤16例的MR I表现,并和手术病理结果进行比较。结果所有病例均位于髓外硬膜下,颈段6例,胸段5例,胸腰交界处3例,腰段2例。MR I T1W I呈长椭圆形边界清楚的混杂等、低信号肿块,内有点、片状更低信号区,T2W I肿块表现为混杂等、高信号,内有点、片状更高信号区。增强T1W I呈不均匀明显强化,内部点、片状更低信号区无明显强化。上述表现和病理对照,肿瘤由Anton iA区和Anton i B区相互交错组成,Anton i B区集中在囊变、出血区,增强无明显强化,Anton i A区由富细胞区及胶原组成,为增强明显强化区。结论椎管内神经鞘瘤的MR I表现与其病理改变有关,这些变化对正确诊断具有指导意义。     

Retroperitoneal ancient schwannoma: Review of clinico-radiological features

A case is reported here of an ancient schwannoma in the retroperitoneum. The findings of abdominal ultrasound and CT in a patient with a retroperitoneal ancient schwannoma are presented, and the clinical and radiological features of this unusual tumour are reviewed. The presence of a large, well-delineated complex cystic mass in the deep soft tissues should raise the possibility of an ancient schwannoma. It is important to recognize these tumours as benign with excellent prognosis so as to avoid unnecessary radical surgery.     

Extraosseous schwannoma of the mental nerve clinically simulating intraosseous

We report a case of a benign neurilemmoma arising from the right mental nerve. Schwannomas are rare neurogenic tumours that originate from Schwann cells of the peripheral nervous system. Frequent locations are the head and neck region. Most of the tumours occur in the soft tissue whereas intraosseous schwannomas are rare. This case report deals with a young patient who was referred to our hospital with an unidentified fast-growing tumour located mainly in the premolar region of the right mandible. The tumour presented as an expansive, unilocular, well defined, radiolucent lesion on orthopantomography. No expansion of the mandibular canal could be seen. Computerized tomography scans of the mandible helped to identify the solid nature of the tumour. A biopsy was necessary to make the final diagnosis and the tumour was then excised surgically. Postoperative magnetic resonance imaging scans and a histological examination of the surgical specimen showed no signs of neurofibromatosis type 2.     

下颌骨神经鞘瘤1例

神经鞘瘤在临床上以全身软组织多见,但骨内神经鞘瘤较罕见。本文报道发生于右下颌骨内的神经鞘瘤1例,并结合相关文献探讨下颌骨神经鞘瘤的临床特点、诊断、治疗及预后。     

Orbital neurilemmoma: report of seven cases

Neurilemmoma (schwannoma) has a predilection for the head and neck, especially the eighth cranial nerve in the cerebellopontine angle. It rarely occurs in the orbit, representing only 1% of orbital tumours. We report seven cases. The nerve of origin was identifiable in four cases. Two occurred within the inferior oblique muscle. Five were treated successfully by anterior or lateral orbitotomy without craniotomy and two required a combined cranio-orbitotomy. The majority of orbital neurilemmomas occur as discrete intraorbital lesions without intracranial extension and can be safely removed via orbitotomy alone.     

Subcarinal neurogenic tumor: Report of a case

We present herein the rare case of a 63-year-old man in whom a subcarinal tumor, demonstrated by enhanced chest computed tomograms (CT), was subsequently confirmed to be a neurilemmoma by histological examination following tumor resection through a diagnostic thoracoscopy. Magnetic resonance imaging (MRI) and transesophageal ultrasonogram findings excluded the possibility of malignant lymphoadenopathy. As the patient was also found to have an elevated level of the squamous cell carcinoma (SCC) tumor marker which did not resolve postoperatively, close follow-up will be required.