[Polymyositis and essential thrombocytopenia. A case report]

Area of Science:

• Neurology
• Hematology
• Oncology

Background:

• Polymyositis (PM) is linked to increased solid tumor risk.
• Lymphoma and chronic lymphoid leukemia are common hematologic malignancies associated with PM/dermatopolymyositis.
• Associations between PM and myeloproliferative disorders are exceptionally rare.

Observation:

• This report describes the first simultaneous presentation of polymyositis and essential thrombocytemia (ET).
• The patient's polymyositis showed a significant and rapid response to corticosteroid treatment.
• Essential thrombocytemia presented with severe thrombotic and hemorrhagic complications.

Findings:

• The polymyositis demonstrated notable sensitivity to corticosteroids, achieving swift clinical and biological control.
• Despite effective cytostatic treatment for essential thrombocytemia, the patient succumbed to its complications.
• This case represents the first documented instance of concurrent polymyositis and essential thrombocytemia.

Implications:

• This case underscores the rare paraneoplastic significance of polymyositis in relation to myeloproliferative disorders.
• It highlights the critical need for thorough investigation of potential underlying hematologic malignancies in polymyositis patients.
• Further research is warranted to understand the complex interplay between inflammatory myopathies and myeloproliferative neoplasms.