Orbital cellulitis with periosteal elevation.

Computerized tomography scan evidence of periosteal elevation in patients with orbital cellulitis is interpreted in the current medical literature as an indication of subperiosteal abscess. We present three such cases in which surgical drainage yielded clear fluid or granulation tissue rather than pus. A fourth case resolved on antibiotic therapy alone. Cases of periosteal elevation that resolve without surgery may represent inflammatory effusion, infections of lesser virulence, or propagation of granulation tissue rather than true abscesses. We suggest that periosteal elevation seen in patients with orbital cellulitis should represent a relative rather than an absolute indication for drainage surgery.