is a midline, wedge-shaped segment of the central skull base that extends inferiorly to the foramen magnum and is bordered laterally by the petroclival fissures.
Caption: Figure 1: Sagittal section of T2-weighted magnetic resonance imaging showing well-defined hyperintense expansile soft tissue lesion arising from the nasopharynx, invading sphenoid and clivus
The abducens nerve exits the pons, runs along the bony clivus
, enters the cavernous sinus through Dorello's canal, and subsequently runs through the middle of the cavernous sinus in close relation to the internal carotid artery medial to CN III, IV, and V [5, 6].
Magnetic resonance imaging (MRI) showed a large mass with central necrosis or suppuration in the right skull base, centering at the right petrous bone and the clivus
Second, the dystopic os odontoideum is cranially displaced usually fused to the basion of the clivus
. This smooth small ossicle is of variable sizes, around half the size of the normal dens and associated with hypertrophied and rounded anterior arch of C1.
CVA was ruled out; however bone marrow lesions involving the left and the right clivus
, right Meckel's cave, and posterior margin of the right cavernous sinus were noted (Figure 1).
Thirteen and three cases with tumors in clivus
received total and subtotal tumor removal, respectively.
heterogenea con moderado reforzamiento con el medio de contraste que ocupaba fosa nasal derecha, etmoides posterior, esfenoides, nasofaringe y erosionaba el arco cigomatico, clivus
, apex petroso derecho y fosa craneal media, ademas envolvia a la arteria carotida interna, al seno cavernoso y al canal vidiano (Figuras 1B y C).
The tumor had a broad attachment that spanned from orbit to orbit and from clivus
to the ethmoid roof.
En 1856, Hubert von Luschka realizo la primera descripcion de un cordoma en el clivus
; sin embargo, Rudolf Virchow, en 1857, hizo su primera descripcion histologica y atribuyo su crecimiento a un origen cartilaginoso con degeneracion hidropica celular.
Post contrast T1 MRI weighted images detected diffuse enhancement in the area of the right cavernous sinus, extending basally towards the trigeminal cave and anteriorly towards the apex of the right orbit, with right-sided temporal-basal dural sheath imbibition and along the clivus
. Hypointense signals were detected in the area of the right cavernous sinus and Meckel's cave on short tau inversion recovery (STIR) and T2 MRI weighted images (Figs.
Aneurysmal bone cyst occurring in the base of skull, particularly clivus
is a rare occurrence and accounts for less than or equal to 1% of the cases.