Cranial hemophilic pseudotumor associated with factor IX deficiency: case report

Tomoo Inoue, Yasuhiro Suzuki, Shinjitsu Nishimura, Kensuke Murakami, Michiharu Nishijima

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)


    Background: Hemophilic pseudotumor is an unusual complication occurring in only 1% to 2% of patients with severe factor VIII or IX deficiency, and manifests as a progressive enlargement of hematoma by recurrent hemorrhage, often resulting in bone destruction or resorption due to the chronic pressure of osseous hemorrhage. Cranial hemophilic pseudotumors are extremely rare, with only 4 previous cases associated with mild or moderate factor XIII deficiency. Case Description: A 24-year-old man with moderate deficiency of factor IX developed a cranial pseudotumor as a swelling in the frontal scalp. Blood coagulation profile revealed extended activated partial thromboplastin time (58.2 seconds). Factor IX analysis showed 3% of normal activity. Computed tomography and magnetic resonance imaging demonstrated an extra-axial lesion with bone destruction, enhanced rim, and signal changes consistent with chronic hemorrhage. Surgical removal was performed. Histologic examination disclosed old blood coagulum. Conclusions: This case of cranial hemophilic pseudotumor in a patient with moderate factor IX deficiency suggests that cranial pseudotumor should be considered in the differential diagnosis of cranial lesion in a patient with hemophilia, and adequate replacement therapy in the perioperative period is essential to achieve safe surgical removal.

    Original languageEnglish
    Pages (from-to)647-651
    Number of pages5
    JournalSurgical Neurology
    Issue number6
    Publication statusPublished - 2008 Jun 1


    • Cranium
    • Factor IX deficiency
    • Hemophilia
    • Pseudotumor

    ASJC Scopus subject areas

    • Surgery
    • Clinical Neurology


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