Fig. 6. An 18-year-old boy had onset of right proptosis during a sickle cell crisis. Abnormal radiodensity is seen along the lateral wall of the orbit with a similar process in the intratemporal fossa. Bone scanning showed decreased uptake consistent with a sphenoid bone infarct. (Harris GJ, Beatty RL: Acute proptosis in childhood. In Linberg JV [ed]: Oculoplastic and Orbital Emergencies. Norwalk, CT: Appleton & Lange, 1989:94.)