A Rare Case of a Solid Variant Aneurysmal Bone Cyst of the Medial Sphenoid Bone: Clinical Features, Diagnostic Points, and Treatment

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  • YAMASHITA Shinji
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • TOMONAGA Takumi
    Department of Anatomic Pathology, Pathological Sciences, Graduate School of Medical Sciences, Kyushu University
  • OKITA Yoshiko
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • SATO Yuichiro
    Section of Oncopathology and Morphological Pathology, Department of Pathology, Faculty of Medicine, University of Miyazaki
  • MATSUMOTO Fumitaka
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • OKUYAMA Hironobu
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • OGASAWARA Natsuki
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • TAMURA Mitsuru
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • KAWANO Tomoki
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • YOKOGAMI Kiyotaka
    Department of Neurosurgery, Faculty of Medicine, University of Miyazaki
  • KIWAKI Takumi
    Section of Oncopathology and Morphological Pathology, Department of Pathology, Faculty of Medicine, University of Miyazaki
  • FUKUSHIMA Tsuyoshi
    Section of Oncopathology and Morphological Pathology, Department of Pathology, Faculty of Medicine, University of Miyazaki

Bibliographic Information

Published
2025-12-31
Resource Type
journal article
DOI
  • 10.2176/jns-nmc.2025-0055
Publisher
The Japan Neurosurgical Society

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<p>A 5-year-old boy presented to our hospital with ptosis and an abnormal ocular position. Magnetic resonance imaging showed a well-defined mass measuring 20 mm in diameter in the medial sphenoid bone extending to the orbit and compressing the external ocular muscle. The patient underwent total surgical excision and was subsequently diagnosed with a solid variant of aneurysmal bone cyst via molecular integrated diagnosis. Solid variant of aneurysmal bone cyst is an extremely rare subtype of aneurysmal bone cyst, accounting for 0.2% of all primary bone tumors. It is characterized by the absence of a solid cystic component, which is difficult to diagnose via conventional hematoxylin and eosin staining. Molecular analyses revealed that this subtype is also characterized by the rearrangement of USP6 and the absence of the H3F3A mutation. This report discusses the clinical features of this extremely rare neoplastic lesion, the importance of an integrated diagnosis, and treatment options.</p>

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