Orbital Roof Radiology

The complementary roles of mri and ct well shown in this case.

Orbital roof radiology.

The orbit has four walls. The medial orbital walls run virtually parallel but due to the shape of the orbits their long axes diverge at approximately 45. Tumors lymphoma metastasis lacrimal gland or duct tumors rhabdomyosarcoma of the orbit retinoblastoma optic nerve meningioma optic nerve glioma optic nerve schwannoma neurofibroma. 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.

They are usually seen in patients with pneumatization of the orbital roof 1 5. Gross anatomy in the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml. A roof floor medial and lateral wall all of which converge posteriorly at the orbital apex. Fracture of the left zygomaticomaxillary attachmnet with fracture of the anterior and lateral maxillary walls inferior orbital rim fracture and left maxillary hemosinus.

Large round bony mass protruding superior and medially from the left anterior cranial fossa floor. 1 the roof of the orbit is composed of the frontal bone anteriorly and the lesser wing of sphenoid posteriorly. This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins. Orbital roof fracture icd 801 01 etiology.

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. Communited mildly depressed left orbital roof fracture. Fissure fracture of the left sphenoid wing. Orbital fat and the medial rectus muscle may prolapse into the ethmoid air cells.

Orbital process of the frontal bone orbital process of the zygomatic bone. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall. 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.

The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids. Smooth eros ion of the orbital roof is present but there is no evidence of aggressive bone destruction fig. Pathologic examination con firmed neurofibroma. Pure superior blowout fractures without associated orbital rim fracture are uncommon.

It is a thin lamina separating the orbit anteriorly from the frontal sinus and posteriorly from the anterior cranial fossa. It has a roof floor medial and lateral wall.