title: Haemangiopericytoma of occipital bone with invasion of the transverse sinus.
abstract: A 44-year-old man presented with a painless left occipital mass which had enlarged over 4 months and was neurologically asymptomatic. Computed tomography and magnetic resonance imaging showed a large lytic tumour extending on both sides of the transverse sinus with intracranial and scalp extension. Angiography showed that the tumour was highly vascular. Preoperative embolisation of some of the main feeding vessels was performed, but a two-staged operation was needed for total removal of the tumour because of profuse bleeding from the tumour and bone. Histological examination disclosed numerous thin-walled 'staghorn' shaped capillaries and dense cellularity with atypical mitotic figures. The histological diagnosis was a primary haemangiopericytoma of the bone. He received external radiotherapy of 60 Gy. At 2 years follow-up, he remained well without recurrence. The optimal treatment for haemangiopericytoma is radical excision followed by radiation therapy. The need for long-term observation is emphasised because of the notorious tendency to recurrence and metastasis.
authors.affiliation: Department of Neurosurgery, Yokohama Minami Kyosai Hospital, Matsuura, Kanazawa-ku, Yokohama, Japan.
authors.forename: C C
authors.initials: CC
authors.lastname: Chang
authors.forename: N
authors.initials: N
authors.lastname: Kuwana
authors.forename: Y
authors.initials: Y
authors.lastname: Tanabe
authors.forename: H
authors.initials: H
authors.lastname: Kitamura