Postoperative CT findings in acoustic neurinomas operated upon by a translabyrinthine approach

Summary The findings at CT examinations, performed on 46 patients with acoustic neurinomas about 6 months after translabyrinthine surgery, were analyzed and compared with preoperative findings. Direct as well as indirect signs of expansion had disappeared postoperatively. Bulging of cerebellar tissue towards the operative defect in the petrous bone, a finding not connected with local adhesions, was notable. Hypodensity in the vicinity of the removed tumor occurred either due to local widening of the subarachnoid space or due to changes within the cerebellar parenchyma. Local and general widening of the fourth ventricle as a sign of atrophy was a frequent finding.     

Traumatic Neuroma around the Celiac Trunk after Gastrectomy Mimicking a Nodal Metastasis: A Case Report

Traumatic neuroma is a well-known disorder that occurs after trauma or surgery involving the peripheral nerve and develops from a nonneoplastic proliferation of the proximal end of a severed, partially transected, or injured nerve. We present a case of traumatic neuroma around the celiac trunk after gastrectomy in a 56-year-old man, which was confirmed by pathology. CT demonstrated the presence of a lobulated, homogeneous, hypoattenuating mass around the celiac trunk, mimicking a nodal metastasis.     

Bilateral acoustic neuromas

This article reviews 12 patients with bilateral acoustic neuromas. The sex incidence was equal and the mean age at diagnosis was 26.2 years. The family history was positive in nine of the patients. Five patients have had incomplete surgical removal of acoustic neuromas on both sides. Two of them are completely deaf and the other three have severe sensorineural hearing loss in one ear and no hearing in the other ear. In five patients the tumour on one side has been operated on and the other side is being observed with at least short-term preservation of good hearing. The remaining two patients died of intra-cranial complications, one of them post-operatively. Four patients developed facial palsy immediately following surgery and one developed facial weakness 6 months after surgery. Guidelines are discussed for the care of these patients including the timing of surgery and alternative treatment options (observation, radio-surgery adn chemotherapy). This is essentially a group of young individuals who have had multiple operations for bilateral acoustic tumours and associated manifestations and for whom the disease and the sequelae of treatment can be tragic.     

Computed tomography for small acoustic neuromas

Summary The minimal size of acoustic neuromas detectable by computed tomography (CT) is, according to the available literature, 1.5 to 2 cm. The new otoneurosurgical technic using the transtemporal and translabyrinthine approach necessitates an early diagnosis of neuromas protruding 1 cm or less into the cerebellopontine angle cistern. This seemed impossible with the available CT equipment. Eight proven acoustic neuromas 1 cm or less in diameter, detected with CT, are reported. Diagnostic criteria are elaborated. The study shows that small cerebellopontine angle tumors can be detected by use of CT machines of the newer generation which perform scanning with thin and overlapping slices.     

Hypoglossofacial anastomosis for facial palsy after resection of acoustic neuroma

Twelve patients with facial palsy after resection of acoustic neuromas were treated by hypoglossofacial anastomosis. The nerve anastomosis were performed 1-2 months after resection of the tumor in 10 cases (group A). Two cases (group B) had the anastomosis performed more than 2 years after damage to the facial nerve. All the cases had been followed for more than 9 months. The results of reinnervation of the paralyzed facial muscles were quite satisfactory, i.e., over 80% of the cases obtained a good functional recovery. Although there was a 2-month delay in functional recovery of group B patients, the final results were practically the same in both groups. Therefore, the effect of the duration of the paralysis of the facial nerve seems to be less important in facial nerve surgery than in nerve surgery of the extremities. The procedures of anastomosis of descendens hypoglossi to the distal stump to the hypoglossal in 7 of the 10 patients using the hypoglossal as the donor nerve was of little help in prevention or restoration of the hemiatrophy of the tongue. In spite of long-term inconvenience in speaking and eating after section of the hypoglossal, all the patients were able to make enough adjustments about 2-3 months after nerve surgery.     

小脑桥脑角占位性病变的CT表现和诊断

分析１１４例经手术病理或脑血管造影证实的ＣＰＡ占位性病变的ＣＴ表现。ＣＰＡ脑外病变的定位征象有脑组织受压移位，患侧桥池和／或环池增宽，宽基底与岩骨相贴，岩骨侵蚀破坏，肿瘤轮廓清晰，瘤周水肿少见且程度轻。脑内病变延伸至ＣＰＡ表现为病变大部分位于一侧小脑半球或脑干，向患侧ＣＰＡ延伸，患侧桥池和／或环池受压变窄或闭塞。患侧桥池和／或环池增宽与否是鉴别ＣＰＡ病变来自脑外或脑内的重要征象。     

听神经瘤切除术的护理体会

听神经瘤是颅内较少见的肿瘤,由于其位置深,局部解剖复杂,手术难度大,我院过去做此手术较少,近年来,随着脑外科技术的改进,特别是双极电凝及显微技术的发展,使听神经瘤的患者,在我院能得到手术切除并取得成功[1]。我院自2001年至2005年3 a中共收治听神经瘤病人20例,现将手术护理体会总结如下。1临床资料本组20例,男12例,女8例,年龄26岁64岁,平均45.2岁。病程6个月8 a,平均3.8 a。首发症状为病侧耳鸣、耳聋16例(80%),步态不稳14例(70%),眼睑闭合不全12例(60%),声嘶、吞咽困难4例(20%)。本组均在全麻下经枕下入路行听神经瘤切除术,无死亡。2术…