In CT imaging after traumatic brain injury, mass effect is most clearly indicated by which description?

In CT imaging after traumatic brain injury, mass effect is most clearly indicated by which description?

• A. The displacement of brain structures due to a lesion
• B. A tiny bruise with no swelling
• C. A normal CT scan
• D. A stable, non-progressive injury

Answer: (A)

Mass effect after a traumatic brain injury is the brain being physically pushed out of its normal position by something occupying space inside the skull, such as a hematoma or swollen tissue. On CT, this shows up most clearly as displacement of brain structures caused by a lesion, which can manifest as a midline shift, compression of the ventricles or cisterns, and potential herniation. That description directly captures the idea of tissue being pushed aside by a space-occupying process, making it the best fit for mass effect. In contrast, a tiny bruise with no swelling would not cause displacement; a normal CT shows no mass effect; and a stable, non-progressive injury implies no ongoing shifting or compression.

Mass effect after a traumatic brain injury is the brain being physically pushed out of its normal position by something occupying space inside the skull, such as a hematoma or swollen tissue. On CT, this shows up most clearly as displacement of brain structures caused by a lesion, which can manifest as a midline shift, compression of the ventricles or cisterns, and potential herniation. That description directly captures the idea of tissue being pushed aside by a space-occupying process, making it the best fit for mass effect.

In contrast, a tiny bruise with no swelling would not cause displacement; a normal CT shows no mass effect; and a stable, non-progressive injury implies no ongoing shifting or compression.