In a patient with minor traumatic brain injury, what indicates the need for a CT scan?

The presence of hemotympanum is a key clinical indicator for the need for a CT scan in a patient with a minor traumatic brain injury. Hemotympanum, which is the presence of blood in the tympanic cavity of the ear, often suggests a skull base fracture. This condition can be associated with significant intracranial injuries, such as lacerations of the meninges or bleeding within the cranial cavity. A CT scan is vital to evaluate the extent of injury and the possibility of associated complications, such as hemorrhage or structural damage that may not be apparent on a physical examination.

In contrast, while a high blood alcohol concentration may suggest potential impairment, it does not directly indicate the need for imaging. An isolated scalp laceration could be significant, but by itself does not necessitate a CT scan unless there are other more concerning signs or symptoms present. Similarly, the presence of a mandibular fracture is an important finding but does not automatically warrant a CT scan for intracranial injury unless accompanied by worrisome neurological signs.