In early 1990, the family of an 18-year-old girl in Vallecas, a town near Madrid, Spain, noticed a disturbing change in her behavior. A girl began experiencing hallucinations and convulsions that left her family deeply concerned. Her episodes were sudden and intense—she would erupt in fits of rage, barking, growling, and hissing at her siblings. She confided in her family that she saw “shadows” moving through her room at night. The family sought answers from multiple doctors, but none could explain her strange symptoms. In August 1991, Estefania was admitted to a hospital in Madrid for further evaluation. Despite extensive…
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