A Solitary Bone Cyst in the Frontal Bone

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  • Kudo Hiroshi
    Department of Neurosurgery, Rokko Island Hospital
  • Horio Mitsuzo
    Department of Second Division of Pathology, Kobe University School of Medicine
  • Takamoto Takeshi
    Department of Neurosurgery, Rokko Island Hospital
  • Maeda Sakan
    Department of Second Division of Pathology, Kobe University School of Medicine
  • Tamaki Norihiko
    Deparment of Neurosurgery, Kobe University School of Medicine

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  • 前頭骨に発生したsolitary bone cystの1例

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We report the rare case of a 34-year-old woman with a solitary bone cyst in the left frontal bone. On consulting another hospital, since a localized swelling appeared in the left frontal area, a lipoma or a hematoma in the scalp was suspected. This swelling then disappeared about one month later, but the area gradually began to depress. At this point the patient sought our advice. Plain skull X-rays showed an osteolytic lesion in the left frontal bone, but the preoperative diagnosis remained obscure. Surgery was performed, and a histological examination of a specimen of the bone defect showed a cyst wall consisting of fibrous connective tissue and normal surrounding bone. On magnified microscopic inspection, neither epithelial nor endotherial cells were seen and the cyst wall was found to consist of non-specific fibrous connective tissue. Thus, the diagnosis was solitary bone cyst. A solitary bone cyst is most frequently encountered in long bones and rarely in the mandible, the maxilla, or the zygoma. Seldom does it occur in the skull. Of the long bone cyst cases that have been reported, in approximate-ly half of the patients who were treated by curettage and given an incomplete packing of the cyst had a long-bone recurrence of the cyst. Therefore, total excision of a bone cyst of the skull and an artificial cranioplasty is recommeded. Although a solitary bone cyst of the skull is extremely rare, this possibility should be considered when achieving a differential diagnosis, based on plain X-rays revealing an osteolytic lesion of the skull.

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