Abnormal protrusion or displacement of an eye or other body part.
- Signs of orbital injury include periorbital ecchymosis, edema, proptosis, and bony step-offs of the orbital rim.
- The skull is a frequent site of bone metastases, which commonly present as proptosis and periorbital ecchymoses.
- A 35-year-old man presented with symptoms of decreased visual acuity, proptosis, and ptosis of the left eye that had lasted for 2 weeks.
Late 17th century: via late Latin from Greek proptōsis, from pro 'before' + piptein 'to fall'.
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