Orbital Roof Radiology

Communited mildly depressed left orbital roof fracture.

Orbital roof radiology.

Large round bony mass protruding superior and medially from the left anterior cranial fossa floor. The complementary roles of mri and ct well shown in this case. 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. Isolated orbital roof fractures in adults are uncommon comprising 12 19 of all orbital wall fractures.

Gross anatomy in the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml. Orbital process of the frontal bone orbital process of the zygomatic bone. Fissure fracture of the left sphenoid wing. The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids.

The orbit has four walls. This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins. Orbital fat and the medial rectus muscle may prolapse into the ethmoid air cells. Pathologic examination con firmed neurofibroma.

Smooth eros ion of the orbital roof is present but there is no evidence of aggressive bone destruction fig. A roof floor medial and lateral wall all of which converge posteriorly at the orbital apex. It is a thin lamina separating the orbit anteriorly from the frontal sinus and posteriorly from the anterior cranial fossa. An orbital mass carries a relatively wide differential.

Fracture of the left zygomaticomaxillary attachmnet with fracture of the anterior and lateral maxillary walls inferior orbital rim fracture and left maxillary hemosinus. It has a roof floor medial and lateral wall. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall. Superior orbital fissure lies between the lesser and the greater wing of sphenoid.

Orbital roof fracture icd 801 01 etiology. 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. Tumors lymphoma metastasis lacrimal gland or duct tumors rhabdomyosarcoma of the orbit retinoblastoma optic nerve meningioma optic nerve glioma optic nerve schwannoma neurofibroma.

The overall imaging appearance is most compatible with a benign lesion of a non vascular cause. They are usually seen in patients with pneumatization of the orbital roof 1 5.