Migration: A Notable Feature of Cerebral Sparganosis on Follow-Up MR Imaging

Case 10. Axial postcontrast T1-weighted images of a 27-year-old male patient with a 2-year history of seizures and headaches. A–C, There is an irregular enhancing lesion with a central tunnel in the left parietal lobe on baseline MR imaging. No active lesion can be seen in the occipital and temporal lobes. D, Eleven months later, a migrated lesion with ringlike enhancement is detected in the left occipital lobe. E and F, The lesion continues migrating to the left temporal lobe, showing typical tunnel-like enhancement 38 months after baseline MR imaging. The initial lesion in the left parietal lobe has regressed with no enhancement.

Case 3. Axial postcontrast T1-weighted images of a 12-year-old male patient with a 4-year history of seizures. A, Baseline MR imaging shows a multiloculated lesion with rim enhancement in the left thalamus. B, Four months later, a migrated lesion is detected in the right thalamus. The initial lesion is regressing, with mild enhancement.

Case 5. Axial images of a 36-year-old male patient with seizures and left hemiparesis for 17 years. A, Axial postcontrast T1-weighted image shows a lesion with multi-ringlike enhancement in the right cerebral hemisphere. B and C, Four months later, an abnormal branchlike hypointensity is detected in the right cerebellar peduncle on T2-weighted and FLAIR images. D, Eleven months later, a migrated lesion with small ringlike enhancement is detected in the pons. Note that the signal change on B and C indicates the continuity between the primary lesion and the migrated one.