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Brain Scan Mistake: Tapeworm Larvae Mimic Cancer
29 Jun
Summary
- Fluid-filled cysts from tapeworm larvae were mistaken for metastatic brain cancer.
- The Spanish patient had no travel history to endemic regions for the parasite.
- Early detection of the tapeworm could prevent unnecessary cancer treatments.
A perplexing medical case in Spain involved a 60-year-old man initially diagnosed with metastatic brain cancer. Scans revealed multiple lesions that strongly suggested advanced cancer spreading throughout his brain. However, a series of comprehensive tests, including whole-body scans and a colonoscopy, failed to locate any primary cancer source.
Subsequent detailed MRI scans identified several fluid-filled cysts within the patient's brain, some containing tapeworm heads. A blood test confirmed neurocysticercosis, a central nervous system infection caused by pork tapeworm larvae. This diagnosis was surprising as the patient was a lifelong resident of Castellón, Spain, and had no recent travel history to regions where the disease is endemic.
Researchers suggested the infection may have occurred years prior through accidental ingestion of microscopic tapeworm eggs, possibly from contact with migrant coworkers on a construction job. The patient received treatment with albendazole, praziquantel, and corticosteroids, leading to a full recovery with no complications. The case emphasizes that neurocysticercosis should be considered in differential diagnoses for brain lesions, even without a travel history.
