A 55-year-old right-handed veteran received a small shrapnel wound in the head. Within 1 year of receiving his wound, the man complained of seizures and was treated with seizure medication. The medication was not effective, and a section of the anterior corpus callosum was performed successfully. Which of the following neurologic deficits is most likely?
**Core Concept**
The anterior corpus callosum is a critical structure for inter-hemispheric communication, connecting the frontal lobes of the two hemispheres. Damage to this region can lead to a range of cognitive and motor deficits, particularly affecting the contralateral side of the body.
**Why the Correct Answer is Right**
The patient's seizures suggest a focus in one of the hemispheres, and the anterior corpus callosum section was performed to prevent seizure spread. This procedure is known as a corpus callosotomy. By severing the anterior corpus callosum, the surgeon aimed to disrupt the communication between the two hemispheres, thereby preventing seizure propagation. This type of surgery is often performed in patients with severe, intractable epilepsy. The anterior corpus callosum is primarily involved in motor functions, such as coordination and fine motor skills. Therefore, the patient is likely to experience motor deficits on the contralateral side of the body.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the patient's symptoms are more likely related to motor deficits rather than sensory or visual disturbances, which are typically associated with posterior corpus callosum lesions.
**Option B:** This option is incorrect because the patient's deficits are more likely to be motor-related rather than cognitive or language-related, which are typically associated with lesions in the frontal or temporal lobes.
**Option C:** This option is incorrect because the patient's symptoms are more likely related to motor deficits rather than emotional or personality changes, which are typically associated with bilateral frontal lobe lesions.
**Option D:** This option is incorrect because the patient's deficits are more likely to be motor-related rather than related to spatial awareness or navigation, which are typically associated with parietal lobe lesions.
**Clinical Pearl / High-Yield Fact**
The anterior corpus callosum is often involved in motor functions, and damage to this region can lead to significant motor deficits, including coordination and fine motor skill impairments. A corpus callosotomy may be performed in patients with severe, intractable epilepsy to disrupt seizure propagation between hemispheres.
**Correct Answer:** C.