John R. Knorr

Desmoplastic infantile ganglioglioma: CT and MRI features

We present three cases of desmoplastic infantile ganglioglioma in patients admitted to our institution in the past 8 years. CT and MR findings are discussed. Typically, these lesions are located in the frontal and parietal lobes, appearing as cystic tumors with a solid cortical component within the cerebrum, which enhances intensely, and moderate surrounding edema.

Anterior communicating artery aneurysm rupture: An unusual cause of acute subdural hemorrhage

A case of acute subdural hemorrhage caused by rupture of an anterior communicating artery aneurysm is presented. The patient is a young man who presented with an acute onset of neurologic symptoms; computed tomography revealed subdural hemorrhage in the absence of associated subarachnoid or intraparenchymal bleeding.

Intraspinal dislocation of the rib in neurofibromatosis: A case report

Scoliosis is the most common skeletal abnormality in neurofibromatosis, occurring in at least 10% of patients [1, 2]. Spinal MR is commonly used to assess the intraspinal contents prior to surgery for scoliosis.We report a case of neurofibromatosis I with dysplastic scoliosis which demonstrated an extradural mass on MR. Subsequent CT scan showed the presence of dislocation of the adjacent costovertebral articulation, with herniation of the rib head into the spinal canal.

Cerebellar T-cell lymphoma: an unusual primary intracranial neoplasm

SummaryPrimary T-cell lymphoma within the central nervous system is extremely rare. Imaging characteristics appear indistinguishable from the more common B-cell lymphoma. A case of such a primary tumor is discussed and the MRI and CT findings presented.

Gd-DTPA enhanced MRI of cervical anterior epidural venous plexus

Seventy selected cases were reviewed retrospectively to assess the normal Gd-DTPA enhanced MR appearance of the cervical anterior epidural venous plexus. This structure can enhance quite markedly and has a somewhat variable appearance on MR imaging but we believe that it can be differentiated from pathological enhancement in the area if attention is paid to its normal anatomical characteristics.

Basimeningeal/spinal axis primitive neuroectodermal tumor without intraaxial lesion: radiological features.

Over a 12‐year period, the authors encountered 2 patients with spinal axis/ basimeningeal primitive neuroectodermal tumor (PNET) involving the spinal axis extramedullary, intradural compartment and the basimeninges. In neither patient was an intraaxial focus demonstrated. A 48‐year‐old woman had computed tomography (CT) findings of hydrocephalus and later abnormal basimeningeal enhancement. Cervical myelography revealed a low cervical intradural block. A 10‐year‐old boy was evaluated initially with non‐contrast‐enhanced CT of the brain, which revealed hydrocephalus. Contrast‐enhanced CT revealed abnormal basimeningeal enhancement implicating cisternal obstruction. Subsequent magnetic resonance examination of the entire spine with and without gadolinium enhancement revealed diffuse abnormal enhancement of the spinal axis intradural, extramedullary compartment. While intraaxial PNETs are well recognized, the patients described here represent a distinctly unusual pattern of intradural spinal meningeal and basimeningeal infiltration by PNET in the absence of a demonstrable intraaxial lesion.