摘要:

A series of three patients with primary orbital malignant peripheral nerve health turners (MPNST) is presented. Two of our patiefits who were treated with surgery and postoperative radiotherapy are free of tumor recurrence. The third patient showed a good response to radiation therapy. While surgical excision remains the mainstay of therapy, our patients demonstrate the usefulness of adjuvant radiation therapy in this condition.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

We report two patients with optic disc drusen who suffered sudden, concentric constriction of the visual field. Visual acuity remained normal. The involved discs showed no swelling, hemorrhage, or other evidence of anterior ischemic optic neuropathy. We are unable to explain the mechanism or the pattern of visual field loss in these unusual cases.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Delayed onset ocular ethambutol toxicity is usually considered to be reversible following prompt withdrawal of the drug. However, in a series of seven consecutive patients with severe visual deficit due to ethambutol toxicity, only 42.2% (3 of the 7 patients) achieved a visual recovery of better than 20/200 after an average follow-up of 8.3 ± 2.1 months after stoppage of the drug. On fluorescein angiography, three cases (42.2%) progressed to optic atrophy during the follow-up with permanent visual damage. There were no predisposing or risk factors to contribute toward the poor visual gain. In this background, we recommend discontinuation of ethambutol from the antiruberculous regimen. As an additional sidelight, the value of visually evoked potential in the monitoring of patients on ethambutol, especially in cases with early periaxial neuritis, has been emphasised.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Two children developed mental status alteration and bilateral profound visual loss secondary to optic neuritis. The clinical picture was consistent with parainfectious encephalomyelitis. Magnetic resonance imaging showed bilateral involvement of the thalamus in both cases. In one case the thalamic involvement was solitary and was suspected initially to represent a primary thalamic neoplasm. This was ruled out by a stereotactic biopsy of the thalamus, which showed perivascular inflammation consistent with parainfectious encephalomyelitis. The clinical and neuroimaging findings improved significantly following corticosteroid administration. Several relapses occurred upon initial attempts at corticosteroid cessation.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Eye symptoms and cranial nerve involvement are rather common in nasopharyngeal carcinomas, but early invasion of the optic nerve is very rare. Two cases of nasopharyngeal carcinoma that presented initially with visual loss are reported.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

A case of rhino-orbitocerebral mucormycosis is presented, illustrating the serious nature of this disease. Clinical features and their pathological correlations are demonstrated. The need for a high index of clinical suspicion, and an early biopsy of the affected area is emphasized so that the benefits of early diagnosis and therapy may be gained.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Striking reversible signal intense magnetic resonance imaging (MRI) lesions were observed in the occipital cortex of a 16-year-old girl who presented with an attack of transient cortical blindness as the initial manifestation of hypertensive encephalopathy (HTE). The lesions were seen to best advantage on T2-weighted imaging and were not visible on computed tomography (CT). It is proposed that such occipital lobe MRI lesions likely reflect extravasation of fluid and proteins across the blood brain barrier, damaged as a consequence of cerebral autoregulation failure.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Tonic pupil is due to a lesion of orbital parasympathetic neurons in the ciliary ganglion or short ciliary nerves (1). Precise etiology of the condition remains obscure. In the case described here, development of “tonic pupil” was followed by systemic features typical of lymphomatoid granulomatosis, and diagnosis was confirmed by histology of the skin rash. This case underlines the heterogeneity of the causes of tonic pupil. Vascular occlusion can be a possible mechanism in the pathogenesis of tonic pupil.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Confrontation visual fields have limited value in testing paracentral vision. We have used a four-meter confrontation test for several years at the Mayo Clinic for screening of the central field. This test can identify paracentral scotomas and macular sparing in a homonymous hemianopia. The optics of this technique parallel those of the two-meter tangent screen examination in which a scotoma is greatly enlarged by doubling the test distance. Although in common usage by some neuro-ophthalmologists, this simple technique is useful as an office screening device for evaluating paracentral vision.

ISSN:0272-846X    

出版商:OVID    

年代:1993

数据来源: OVID