[CT and MRI features of arachnoid cyst of the petrous apex: report of 3 cases].

Purpose: To describe the CT and MRI features of 3 cases of arachnoid cyst of the petrous apex.

Patients And Methods: Three patients with isolated trigeminal neuralgia, trigeminal hypoesthesia, and sinusitis. Axial and coronal CT images were obtained.

[Study of the middle ear. Value of multiplanar reconstructions in spiral tomodensitometry].

We point out the interest of computed tomographic reconstructions from spiral acquisition--particularly sagittal reconstructions--in the study of middle ear anatomy and adjacent structures: the facial canal and the chorda tympani. The reference reconstructions are axial and coronal reconstructions. So, we demonstrate the superiority of sagittal reconstructions for the visualization of the lateral process of the malleus, the body and long process of the incus, the third portion of the facial canal, and the chorda tympani.

[Variability of ultrasonography velocity assessment of the carotid arteries].

Purpose: To assess the intraobserver variability of echoDoppler sonographic measurement of various carotid arteries parameters.

Materials And Methods: Repeated bilateral carotid examinations were performed in ten healthy subjects, using three color-coded duplex ultrasound systems (two Acuson 128 XP, one ATL HDI 3000) and different linear probes. Each examination included two successive sets of measurements.

[Radiological diagnosis of renal sarcoidosis].

We report a case of renal sarcoidosis revealed by a malignant hypertension associated with renal insufficiency. Ultrasonographic and CT findings are described. The lesions showed multifocal hypoechogenic areas within the renal parenchyma.