Brain imaging demonstrating the four stages of parenchymal neurocysticercosis. A: Magnetic resonance imaging (MRI) of a vesicular cyst. Note the well-defined scolex, minimal contrast enhancement, and mass effect. B: MRI of a colloidal cyst. Note ring enhancement, loss of the scolex, and perilesional edema. C: MRI of the nodular/granular stage. Note nodule with diffuse enhancement and no cystic component. D: Noncontrast computed tomography showing multiple punctuate calcifications.