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Evaluation of Emergency CT Scans of the Head: Is There a Community Standard?

William K. Erly1, Boyd C. Ashdown2, Richard W. Lucio, II3, Raymond F. Carmody1, Joachim F. Seeger1 and Jennifer N. Alcala1

1 Department of Radiology, The University of Arizona Health Sciences Center, 1501 N. Campbell Ave., Tucson, AZ 85724-5067.
2 Radiology Ltd., 3170 E. Ft. Lowell Rd., Tucson, AZ 85716.
3 Department of Radiology, St. Mary's Hospital, 1601 W. St. Mary's Rd., Tucson, AZ 85745.



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  		Fig. 1. —74-year-old woman with pituitary adenoma. Unenhanced CT scan shows suprasellar mass (arrows) that was missed on preliminary report and subsequently determined to be pituitary adenoma.

 


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  		Fig. 2A. —35-year-old man with hemorrhagic contusion. Unenhanced CT scan shows missed hemorrhagic contusion (arrow). Patient was discharged.

 


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  		Fig. 2B. —35-year-old man with hemorrhagic contusion. Hemorrhagic contusion is depicted on follow-up CT scan obtained when patient was recalled to emergency department the following morning.

 


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  		Fig. 3. —72-year-old man with inferior orbital blow-out fracture. Unenhanced CT scan shows bone fragment (straight arrow) and fat (curved arrow) inferior to right orbital floor.

 


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  		Fig. 4A. —97-year-old woman with infarction in middle cerebral artery territory. Unenhanced CT scan obtained 4 hr after onset of symptoms reveals loss of gray matter–white matter differentiation in right middle cerebral artery territory (arrows).

 


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  		Fig. 4B. —97-year-old woman with infarction in middle cerebral artery territory. Follow-up CT scan obtained several days later reveals extent of infarction.

 

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