Orbital Roof Radiology

Large round bony mass protruding superior and medially from the left anterior cranial fossa floor.

Orbital roof radiology.

The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids. Orbital fat and the medial rectus muscle may prolapse into the ethmoid air cells. Orbital roof fracture icd 801 01 etiology. It has a roof floor medial and lateral wall.

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. They are usually seen in patients with pneumatization of the orbital roof 1 5. Tumors lymphoma metastasis lacrimal gland or duct tumors rhabdomyosarcoma of the orbit retinoblastoma optic nerve meningioma optic nerve glioma optic nerve schwannoma neurofibroma. This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins.

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. 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.

Smooth eros ion of the orbital roof is present but there is no evidence of aggressive bone destruction fig. The orbit has four walls. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall. Pure superior blowout fractures without associated orbital rim fracture are uncommon.

Bilateral mildly displaced nasal bone fractures. The medial orbital walls run virtually parallel but due to the shape of the orbits their long axes diverge at approximately 45. Fracture of the left zygomaticomaxillary attachmnet with fracture of the anterior and lateral maxillary walls inferior orbital rim fracture and left maxillary hemosinus. The overall imaging appearance is most compatible with a benign lesion of a non vascular cause.

1 the roof of the orbit is composed of the frontal bone anteriorly and the lesser wing of sphenoid posteriorly. Superior orbital fissure lies between the lesser and the greater wing of sphenoid. Communited mildly depressed left orbital roof fracture. 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. Orbital process of the frontal bone orbital process of the zygomatic bone.