Periorbital Ecchymosis: Simple Bruise or Skull Fracture Sign?

Periorbital ecchymosis — the common “black eye” — is bruising of the loose, vascular periorbital skin. The great majority of cases are exactly what they appear to be: a simple contusion from direct blunt trauma.

However, the same finding is also one of the classic external signs of a basilar skull fracture. Telling these apart at the bedside is a genuinely important skill.

This is because one requires nothing more than reassurance and cold compresses, and the other requires urgent neuroimaging. The periorbital tissue bruises easily and dramatically, because the skin there is thin and the subcutaneous space is loose.

This allows blood to track and pool visibly, even from a modest injury. This is part of why a black eye often looks more alarming than the underlying injury actually is.

Simple Contusion

Direct blunt trauma to the periorbital region — a fall, a sports injury, an accidental elbow — causes local vessel rupture.

This leads to bleeding into the subcutaneous tissue. This tracks under gravity and produces the characteristic discoloration. The color evolves in a predictable sequence — red-purple, then blue-green, then yellow-brown — over one to two weeks.

Swelling typically peaks within the first 24 to 48 hours and then gradually resolves alongside the color changes.

A simple contusion is usually isolated to the periocular region and develops promptly at the site of direct impact.

It is not accompanied by other neurologic or ocular red flags. Raccoon Eyes: Bilateral Periorbital Ecchymosis and Basilar Skull Fracture

Bilateral periorbital ecchymosis (“raccoon eyes”) without a history of direct bilateral trauma signals an anterior basilar skull fracture.

Blood from the fracture site tracks forward along fascial planes into the periorbital tissue. Unlike a simple contusion, this bruising often takes 1 to 3 days to develop after the initial head injury.

This is because it depends on blood tracking a distance from the fracture site. It does not appear immediately at the point of impact.

This delayed onset is itself a useful clue. Bruising that shows up a day or more after a head injury, especially when bilateral, is a red flag.

This should raise concern for basilar skull fracture, rather than being dismissed as a late-appearing simple bruise.

Associated Findings Suggesting Basilar Skull Fracture

• Battle’s sign — bruising over the mastoid process behind the ear, from a middle cranial fossa fracture
• Cerebrospinal fluid rhinorrhea or otorrhea — clear fluid draining from the nose or ear, from a dural tear
• Hemotympanum — blood visible behind the tympanic membrane
• Cranial nerve deficits, particularly facial nerve palsy or hearing loss, from fracture lines crossing nerve canals
• Altered mental status or other signs of associated intracranial injury

None of these signs alone is required for the diagnosis. A basilar skull fracture can be present with bilateral periorbital ecchymosis as the only external clue.

This is why any patient with a significant head injury and bilateral periorbital bruising warrants a careful search. That search should cover the other findings above.

Associated Ocular Injury

The same trauma that causes periorbital ecchymosis can also injure the globe or orbit.

Any periorbital bruise, whether simple or a marker of skull fracture, should prompt a full ocular exam. This includes visual acuity, pupillary reaction, extraocular movements, and assessment for hyphema, globe rupture, or orbital fracture.

Reduced vision, a teardrop-shaped or irregular pupil, severe pain, or restricted eye movement are signs of more serious ocular injury. These findings considerably change the urgency of the workup.

Evaluation

A history should focus on the mechanism and the timing of bruise onset relative to any trauma.

Associated symptoms — headache, vision change, drainage from the nose or ear, hearing change — guide the decision to image.

CT of the head and facial bones is the study of choice when skull or orbital fracture is a concern. It should not be delayed for a significant injury mechanism or any red flag above, even with a mild bruise.

Management

Simple periorbital contusion is managed conservatively.

Cold compresses in the first 24 to 48 hours limit swelling. Warm compresses afterward encourage resorption, with resolution expected over one to two weeks.

Raccoon eyes from a confirmed basilar skull fracture are managed by treating the underlying fracture and any associated intracranial injury.

This typically involves neurosurgery, observation for cerebrospinal fluid leak, and meningitis prophylaxis where indicated by the fracture pattern.

References

• Wall SP, Rice PL Jr. Periorbital ecchymosis and forensic considerations. Journal of Forensic Sciences.
• Bagheri N, Wajda B, eds. The Wills Eye Manual.
• Rhea JT, Rao PM. Helical CT and three-dimensional CT of facial and orbital injury. Radiologic Clinics of North America.
• American Academy of Ophthalmology. Basic and Clinical Science Course, Section 7: Orbit, Eyelids, and Lacrimal System.