Abstract
Hypereosinophilia is a common issue in medicine. One rare cause is myeloproliferative neoplasm with PDGFRA rearrangement. In these patients, the gold standard for therapy is low-dose imatinib. We present the case of a patient with a new diagnosis of myeloproliferative neoplasm following an unconventional diagnostic pattern, which developed clinically relevant unexplained dizziness a week after starting treatment. Our case presented with lower back pain and multiple bone lesions at MRI investigation. Bone marrow and cytogenetic analysis led to the diagnosis of myeloproliferative neoplasm with PDGFRA rearrangement. We started a treatment with a tyrosine kinase inhibitor (imatinib), and the patient noticed an onset of severe, persistent and intense dizziness, which was more intense with closed eyes. Diagnostic tests were not conclusive, and dizziness persisted at 48 months of follow-up. In conclusion, clinically relevant dizziness was never described in patients with myeloproliferative neoplasm. Even if the exact physiopathological mechanism is not clear, clinicians should know that hypereosinophilia could lead to central nervous system damage.
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