Aims: Infectious mononucleosis, caused by the Epstein-Barr virus (EBV), typically presents with fever, exudative pharyngitis and lymphadenopathy. However, atypical presentations can complicate diagnosis and treatment. The objective of this paper is to illustrate the atypical progression of infectious mononucleosis and to delineate the differential diagnosis that should be considered. Additionally, it outlines the therapeutic approaches for managing symptoms associated with the disease. Case Description: A 25-year-old woman presented at a GP's office with eyelid edema, fever, and significant weight loss. Initial tests and treatments were inconclusive, leading to further investigations. Despite typical treatment for viral infections, the patient’s condition worsened, displaying dyspnoea, acute hepatitis, rash, significantly elevated ESR, hemolytic anemia, leukopenia, and thrombocytopenia. Hospitalization was required for comprehensive care, including steroid therapy and fluid management. Conclusions: This case highlights the diagnostic challenges posed by atypical presentations of infectious mononucleosis and underscores the importance of considering EBV infection in the differential diagnosis. Early recognition and appropriate management are crucial for optimal patient outcomes.
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