Sultan Bhimani

Computed tomography of cerebrovascular calcifications in postsurgical hypoparathyroidism

Surgicalespite the extensive literature on the radiographic appearance of basal ganglia calcification in hypoparathyroidism, the vascular and perivascular deposits that are the hallmark of this disease have not been described radiographically. We report two patients with postsurgical hypoparathyroidism in whom such vascular calcification was observed on CT and was confirmed pathologically in one. The metabolic disturbance leading to the vascular deposits is discussed.

CT appearance of cerebellar glioblastoma multiforme

We report a case of cerebellar glioblastoma multiforme in a young adult. The rarity of this tumor in this location is discussed along with its computed tomographic appearance.

CT findings in a nasopharyngeal extramedullary plasmacytoma.

We report a case of an extramedullary plasmacytoma arising from the nasopharynx. The computed tomographic appearance of this rare tumor is discussed.

Interhemispheric fissure sign of dysgenesis of the corpus callosum

Failure to develop of the corpus callosum and the neighboring midline structures results in abnormal proximity between the interhemispheric fissure (IHF) and the third ventricle. We have called this finding the IHF sign of dysgenesis of the corpus callosum (DCC). In a retrospective study of 39 cases the presence of the IHF sign was assessed in conjunction with the other well recognized CT manifestations of the disorder. These are: (a) lateral ventricles: pointing of the frontal horns, disproportionate enlargement of the occipital horns and separation of bodies of the lateral ventricles; (b) third ventricle: enlargement, elevation and anterior displacement; and (c) interventricular foramen: enlargement. We found that the IHF sign was present concurrently with the other CT signs of DCC in all 35 cases (100%) where the quality of the CT scans permitted its satisfactory evaluation; in the remaining four the sign could not be assessed because of the unsatisfactory quality of the CT scans. Our study confirms that the IHF sign is an additional reliable CT feature of DCC.

Computed tomography in the study of the development of the skull base: 2. Anencephaly, the aberrant skull form

Surgicalhe application of various radiographic modalitieis in the analysis of the paradigm aberrant skull of anencephalics is reported. Again, we found high resolution CT to be the most valuable modality. A detailed description of the skull base changes in anencephaly is presented, and the appropriate embryologic explanation is offered.

Computed Tomography in Penetrating Injury to the Eye

We used computed tomography to detect and localize foreign bodies in two unusual cases of penetrating injury to the eyes. In one case, a large broken twig appeared to have penetrated the globe and the inferior rectus muscle; in the other, the globe was ruptured by many glass shards . In the first case surgery showed the computed tomographic impression to be incorrect. The globe and the inferior rectus muscle were intact and vision and motility were normal postoperatively. In the second case, swelling made direct visualization impossible, and computed tomography was used to locate the foreign bodies.

Intracranial teratoma associated with agenesis of the corpus callosum

Several intracranial tumors are known to occur in conjunction with agenesis of the corpus callosum. We report the occurence of a teratoma with callosal agenesis, an association not previously described, and suggest that the tumors ventral location may serve to differentiate it from other lesions.