Orbital Roof Radiology

This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins.

Orbital roof radiology.

Pure superior blowout fractures without associated orbital rim fracture are uncommon. 1 the roof of the orbit is composed of the frontal bone anteriorly and the lesser wing of sphenoid posteriorly. The orbit has four walls. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall.

Fracture of the left zygomaticomaxillary attachmnet with fracture of the anterior and lateral maxillary walls inferior orbital rim fracture and left maxillary hemosinus. Tumors lymphoma metastasis lacrimal gland or duct tumors rhabdomyosarcoma of the orbit retinoblastoma optic nerve meningioma optic nerve glioma optic nerve schwannoma neurofibroma. The medial orbital walls run virtually parallel but due to the shape of the orbits their long axes diverge at approximately 45. The complementary roles of mri and ct well shown in this case.

The overall imaging appearance is most compatible with a benign lesion of a non vascular cause. Orbital fat and the medial rectus muscle may prolapse into the ethmoid air cells. Fissure fracture of the left sphenoid wing. An orbital mass carries a relatively wide differential.

Smooth eros ion of the orbital roof is present but there is no evidence of aggressive bone destruction fig. It is a thin lamina separating the orbit anteriorly from the frontal sinus and posteriorly from the anterior cranial fossa. The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids. A roof floor medial and lateral wall all of which converge posteriorly at the orbital apex.

Isolated orbital roof fractures in adults are uncommon comprising 12 19 of all orbital wall fractures. Superior orbital fissure lies between the lesser and the greater wing of sphenoid. Orbital roof fracture icd 801 01 etiology. The orbital roof is composed of the orbital plate of the frontal bone with a small contribution from the lesser wing of the sphenoid at the apex figures 3 4 and 3 5.

Bilateral mildly displaced nasal bone fractures. Pathologic examination con firmed neurofibroma. Gross anatomy in the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml. Most roof fractures are associated with other orbital fractures and result from significant head trauma as a high degree of force is required to fracture this portion of the orbit.

Large round bony mass protruding superior and medially from the left anterior cranial fossa floor. Orbital process of the frontal bone orbital process of the zygomatic bone.