Doctors initially suspect metastatic brain cancer in a 60-year-old man after brain scans show lesions that appear consistent with malignancy. Multiple reports say the diagnostic findings instead point to neurocysticercosis, a condition caused by the infection of the brain with the larval form of the pork tapeworm (Taenia solium). The case highlights that imaging results can be misleading: lesions caused by the parasite can resemble tumors on scans, leading clinicians to consider cancer before confirming the underlying cause. Once medical teams identify the cause as tapeworm larvae, the focus shifts to treating the parasitic infection rather than cancer. The reports emphasize the importance of accurate diagnosis to guide appropriate therapy, given that management strategies for brain tumors and neurocysticercosis differ substantially. The account is presented as a diagnostic learning case in which live tapeworms in the brain are ultimately identified instead of cancer.