[A case of symptomatic interhemispheric arachnoid cyst in the elderly].

The incidence of interhemispheric cyst is rare. There have been only 12 cases reported in adults since the advent of CT. We encountered a case of an interhemispheric arachnoid cyst in a 54-year-old patient who had developed paraparesis.

Dissociation of 99mTc-ECD and 99mTc-HMPAO distributions in herpes simplex encephalitis.

In herpes simplex encephalitis (HSE), the authors noted an evident dissociation between the 99mTc-ethyl cysteinate dimer (ECD) and 99mTc-d,l-hexamethyl-propylene-amine oxime (HMPAO) single photon emission computed tomographies (SPECTs). The patient was a 5-year-old boy with diffuse type of pontine glioma, which was treated with hyperfractionated radiotherapy. Two weeks after the completion of radiation therapy, a lesion suggesting that of HSE was noted in the right fronto-temporal region on magnetic resonance images.

Hypervascularity in Lhermitte-Duclos disease--case report.

A 61-year-old male presented with a hypervascular variant of dysplastic gangliocytoma (Lhermitte-Duclos disease) manifesting as gait disorder. Computed tomography and magnetic resonance imaging both showed enhancement of the tumor after injection of contrast medium. Angiography demonstrated a tumor stain.

Dural invasion and proliferative potential of pituitary adenomas.

The relationship between invasiveness and proliferative potential was studied in 31 cases of pituitary adenomas. The invasiveness was determined by histological examination of sellar floor dura resected during transsphenoidal surgery. The proliferative potential of adenoma specimens was examined immunohistochemically using monoclonal antibody (MIB-1).

Cavernous sinus invasion by pituitary adenomas--relationship between magnetic resonance imaging findings and histologically verified dural invasion.

The relationship between magnetic resonance (MR) imaging findings and histologically verified invasion of the cavernous sinus by tumor cells was studied in 26 patients treated surgically for pituitary adenoma. Dural invasion of the sellar floor by tumor cells was found in 10 cases (38%). All patients were classified according to MR imaging findings into three types.