ABSTRACT
Sinus pericranii is a rare vascular anomaly involving an abnormal communication between the extracranial and intracranial circulations. A 3-year-old girl presented with a 2 x 2-cm, midline soft-tissue mass at the vertex. Plain skull films and CT using bone windows showed erosion of the parietal bones. MRI confirmed the clinical diagnosis by identifying communication of the vascular mass with the intracranial dural venous sinus. The advantages of MRI are discussed.
Subject(s)
Cranial Sinuses , Hemangioendothelioma/diagnosis , Magnetic Resonance Imaging , Periosteum/blood supply , Skull Neoplasms/diagnosis , Skull/blood supply , Child, Preschool , Diagnosis, Differential , Female , Hemangioendothelioma/surgery , Humans , Skull Neoplasms/surgery , Terminology as TopicABSTRACT
PURPOSE: To determine whether computed tomographic (CT) angiography with the volume-rendering technique (VRT) can be used to accurately quantify carotid arterial stenosis and to identify occlusions. MATERIALS AND METHODS: Spiral CT was performed in 23 patients who were referred for carotid stenosis evaluation. VRT images and shaded-surface display (SSD) images of 46 carotid arterial bifurcations were compared with findings from digital subtraction angiography (DSA). RESULTS: Agreement on stenosis category between VRT CT angiography and DSA was found in 39 (85%) of the 46 carotid arteries studied. VRT CT angiography was 92% (49 of 53) sensitive and 96% (82 of 85) specific for the detection of grade 2-3 stenoses (> or = 70% stenosis). Agreement on stenosis category between SSD CT angiography and DSA was found in 38 (83%) of the 46 carotid arteries studied. SSD CT angiography was 91% (48 of 53) sensitive and 93% (79 of 85) specific for the detection of grade 2-3 stenoses. Calcified stenoses were correctly graded at VRT CT angiography in 10 of the 10 cases with heavy mural calcified plaques, while eight of the 10 stenoses were accurately quantified at SSD CT angiography. CONCLUSION: These results indicate that VRT CT angiography is as accurate as SSD CT angiography in the evaluation of carotid arterial bifurcations.
Subject(s)
Carotid Arteries/diagnostic imaging , Carotid Stenosis/diagnostic imaging , Tomography, X-Ray Computed/methods , Aged , Aged, 80 and over , Angiography, Digital Subtraction , Female , Humans , Image Processing, Computer-Assisted , Male , Middle Aged , Observer Variation , Sensitivity and SpecificityABSTRACT
The authors report on an observation made at the Niamey hospital, because of the combined infrequency of both human hydatidosis in western Africa and mediastinal localization of the observed cases.
