MR imaging of corpus callosotomy

Area of Science:

• Neurology
• Radiology
• Neurosurgery

Background:

• Medically intractable seizures often necessitate surgical intervention.
• Corpus callosotomy is a surgical procedure to treat severe epilepsy.
• Preoperative Magnetic Resonance (MR) imaging can reveal baseline abnormalities in patients undergoing corpus callosotomy.

Purpose of the Study:

• To review MR findings in patients before and after corpus callosotomy.
• To evaluate the effectiveness of MR imaging in assessing the surgical division of the corpus callosum.
• To identify characteristic MR signal changes associated with corpus callosotomy.

Main Methods:

• Retrospective review of MR studies in 13 patients who underwent corpus callosotomy.
• Analysis of preoperative and postoperative MR images using various pulse sequences.
• Correlation of MR findings with surgical extent (subtotal vs. total callosotomy).

Main Results:

• Preoperative MR showed abnormalities in 5/9 patients, including callosal thinning and atrophy.
• Sagittal T1-weighted images were optimal for visualizing the surgical division, despite a coaptation artifact in two cases.
• Postoperative MR identified surgically related changes such as subacute blood and parafalcial hyperintensity, with motion artifact being problematic in coronal and T2-weighted imaging.

Conclusions:

• Patients undergoing corpus callosotomy may present with normal or abnormal preoperative MR findings.
• MR imaging is a valuable tool for confirming the extent of corpus callosotomy.
• Postoperative MR can detect surgically induced signal changes, including edema and hemorrhage.