Toxic oil syndrome

Toxic oil syndrome (TOS), also known as Spanish toxic oil syndrome, is an acquired multisystem disease caused by ingestion of denatured rapeseed oil that was fraudulently sold as cooking olive oil in Spain in 1981. It is not a genetic disorder but rather a mass poisoning event that affected approximately 20,000 people and caused over 300 deaths. The disease is classified under external causes of accidental poisoning (ICD-10: X46) and is believed to have been triggered by aniline-denatured rapeseed oil containing toxic contaminants, though the precise causative agent has never been definitively identified. TOS affects multiple body systems and progresses through distinct clinical phases. The acute phase (first two months) is characterized by interstitial pneumonia, pulmonary edema, fever, rash, eosinophilia, and myalgia. The intermediate phase (two to four months) features intense myalgia, marked peripheral eosinophilia, thromboembolic events, and skin changes including scleroderma-like lesions. The chronic phase (beyond four months) involves peripheral neuropathy, hepatopathy, pulmonary hypertension, sicca syndrome, scleroderma-like skin changes, musculoskeletal contractures, and neurocognitive impairment. The pathogenesis involves immune dysregulation and vascular endothelial damage. There is no specific cure or antidote for toxic oil syndrome. Treatment has been primarily supportive and symptomatic, including corticosteroids for inflammatory manifestations, physical therapy for musculoskeletal complications, and management of pulmonary hypertension and neuropathy. Long-term follow-up studies of survivors have demonstrated persistent chronic symptoms decades after the initial exposure, including ongoing neuromuscular, hepatic, and pulmonary complications. The event led to significant improvements in food safety regulations in Spain and across Europe.

Common questions about Toxic oil syndrome