No abstract available.
Hip* ; Humans

Malignant neuroepithelioma is a rare neoplasm arising within the peripheral nervous system and usually occurs in the lower extremities. It may involve patients in any age group and have no gender predisposition. In adolescents and adults the tumor must be distinguished from other malignant round-cell tumors. The poor prognosis and the need for aggressive, combined surgical and chemotherapeutic modalities in treating this tumor necessitate a prompt and accurate diagnosis. Authors have experienced a case of malignant neuroepithelioma developed in left sciatic nerve. The diagnosis was confirmed by CT scan, M.R.I., light and electron microscopic findings.
Adolescent ; Adult ; Diagnosis ; Humans ; Lower Extremity ; Neuroectodermal Tumors, Primitive, Peripheral ; Peripheral Nervous System ; Prognosis ; Sciatic Nerve ; Tomography, X-Ray Computed

No abstract available.
Failed Back Surgery Syndrome*

The MR images of 13 patients with brain abscesses were retrospectively reviewed. The abscesses were solitary in 11 patients and multiple in 2 patients. They were located in the corticomedullary junction of the cerebral hemispheres(11) and cerebellum (2).: The sizes of the abscesses were variable, ranging from 1 cm to 5 cm in diameter. They were round (5), oblong (4) or multilobulated (4) in shape. Massive surrounding edema was found in 12 patients. The signal intensity of the abscess contents was hypointense to gray matter and hyperintense to CSF on T1-weighted images, and hyperintense to gray matter on both proton-density-and T2-weighted images. In 5 patients the abscess contents were heterogeneous on both T1-and T2-weighted images. The signal intensity of the abscess walls was isointense(11), slightly hyperintense (1) or hypointense (1) relative to gray matter on T1-weighted images, whereas they were isointense (4) or hypointense (9) on T2-weighted images. Of 10 patients with Gd-enhanced-T1-weighted images, 5 patients(50%) showed thin, smooth, rim enhancement, while the other 5 patients revealed somewhat irregular thick wall enhancement Satellite or daughter abscesses were found in 6 patients. Meningeal or ventricular wall enhancement suggesting meningitis or ventriculitis was associated in 3 and 1 patient, respectively. In conclusion, the characteristic morphology and intensity of the abscess capsule, massive surrounding edema, satellite abscess and associated meningitis or ventriculitis are characteristics of the brain abscess, even though they are not entirely specific to allow for accurate diagnosis in all patients.
Abscess ; Brain Abscess* ; Brain* ; Cerebellum ; Diagnosis ; Edema ; Gray Matter ; Humans ; Magnetic Resonance Imaging* ; Meningitis ; Nuclear Family ; Retrospective Studies

No abstract available.
Humans ; Hyperhidrosis*

No abstract available.
Humans

No abstract available.

No abstract available.
Lymphangioma, Cystic*

No abstract available.
Eyelids* ; Sarcoidosis* ; Skin

We retrospectively analyzed the Magnetic Resonance (MR) imaging findings in 41 cases of histologically proved malignant tumors of oral cariey. The diagnostic value of MR imaging in detection and delineation of the lesions was assessed. The value of MRI was compared with that of Computed Tomography (CT) in 14 patients. Thirty-four cases of 41 malignant tumors were squamous cell carcinomas. Adenoic cystic carcinomas (2 cases), malignant melanomas (2 cases), non-Hodgkin lymphomas (2 cases) and mucoepidermoid carcinoma(1 cases) were also included in this study. Most of the lesions were isointense or slightly hyperintense to muscle on T1 weighted images and showed variable degrees of high signal intensity on T2 weighted images. Two cases of malignant melanomas showed characteristic hyperintensity on T1 weighted images. T2 weighted image was better in detection and delineation of tumor in most of the cases. In 6 cases, Gd-DTPA-enhanced T1 weighted image was better than T2 weighted image. T2 weighted image was useful for the evaluation of deep tissue infiltration and T1 weighted image was useful for the evaluation of bone invasion and superficial tissue plane invasion. The lesion was detected only by MR in 3 cases of 14 in which CT was also performed. MR imaging was more sensitive in the evalustion of bone marrow involvement. MR imaging is very useful modality in evaluating oral cavity malignany and is superior to CT in delineation of the as well as in the evaluation of mandible invasion.
Bone Marrow ; Carcinoma, Squamous Cell ; Humans ; Lymphoma, Non-Hodgkin ; Magnetic Resonance Imaging* ; Mandible ; Melanoma ; Mouth* ; Retrospective Studies