Globe tenting: a sign of increased orbital tension.
Journal - AJNR. American journal of neuroradiology (UNITED STATES )
Globe tenting is a change in the posterior globe configuration that results in a tented or conical appearance and is objectively defined as a posterior globe angle of less than 130 degrees. Globe tenting is caused by an acute/subacute intraorbital mass effect producing significant proptosis with tethering of the globe by the stretched optic nerve. In this series of 10 patients, globe tenting was produced by subperiosteal abscess (five cases), hemorrhage into a lymphangioma (two cases), a varix (one case), traumatic carotid hemorrhage into a lymphangioma (two cases), a varix (one case), traumatic carotid cavernous fistula (one case), and multiple epithelial implantation cysts (one case). Progressive narrowing of the posterior globe angle correlated with an increase in proptosis and in optic nerve length, as well as with more severe visual impairment. Tenting with a posterior globe angle of 120-130 degrees correlated with mild visual symptoms and a good recovery. A posterior globe angle of less than 120 degrees with acute proptosis constitutes a surgical emergency; a delay in surgical decompression in these patients may prevent complete recovery of visual function. CT is useful in providing good characterization of globe tenting and, thus, in helping to determine the clinical significance of this abnormality.
|ISSN : ||0195-6108|
|Mesh Heading : ||Adolescent Adult Child Child, Preschool Exophthalmos Eye Female Humans Male Middle Aged Orbit etiology physiopathology physiopathology|
|Mesh Heading Relevant : ||Tomography, X-Ray Computed radiography radiography radiography|
Computed tomography of calvarial and petrous bone sarcoidosis.
Journal - Journal of computer assisted tomography (UNITED STATES )
This report describes the radiographic features in a case of sarcoidosis involving both the frontal calvaria and the petrous bone. The plain radiographic and nuclear medicine findings were consistent with previous descriptions. High resolution CT demonstrated concentric growth with a lucent advancing margin, ghost-like remnant of partially replaced bone, crossing of suture lines, invasion of contiguous bones, and lack of associated soft tissue mass.
|ISSN : ||0363-8715|
|Mesh Heading : ||Bone Diseases Female Humans Middle Aged Petrous Bone Sarcoidosis Skull Technetium Tc 99m Medronate radionuclide imaging radionuclide imaging radionuclide imaging radionuclide imaging diagnostic use|
|Mesh Heading Relevant : ||Tomography, X-Ray Computed radiography radiography radiography radiography|