hemangiopericytoma

Summary

Summary: A tumor composed of spindle cells with a rich vascular network, which apparently arises from pericytes, cells of smooth muscle origin that lie around small vessels. Benign and malignant hemangiopericytomas exist, and the rarity of these lesions has led to considerable confusion in distinguishing between benign and malignant variants. (From Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1364)

Top Publications

  1. Gengler C, Guillou L. Solitary fibrous tumour and haemangiopericytoma: evolution of a concept. Histopathology. 2006;48:63-74 pubmed
    ..In practice, any HPC-like lesion can be allocated to one of these categories, leaving the ill-defined "haemangiopericytoma" category empty...
  2. Spatola C, Privitera G. Recurrent intracranial hemangiopericytoma with extracranial and unusual multiple metastases: case report and review of the literature. Tumori. 2004;90:265-8 pubmed
    b>Hemangiopericytoma is a rare tumor with uncommon location in the central nervous system...
  3. Verbeke S, Fletcher C, Alberghini M, Daugaard S, Flanagan A, Parratt T, et al. A reappraisal of hemangiopericytoma of bone; analysis of cases reclassified as synovial sarcoma and solitary fibrous tumor of bone. Am J Surg Pathol. 2010;34:777-83 pubmed publisher
    b>Hemangiopericytoma (HPC) was first described as a neoplasm with distinct morphologic features, presumably composed of pericytes...
  4. Hansen T, Katenkamp K, Katenkamp D. D2-40 staining in sinonasal-type hemangiopericytoma--further evidence of distinction from conventional hemangiopericytoma and solitary fibrous tumor. Virchows Arch. 2006;448:459-62 pubmed
    ..Sinonasal-type hemangiopericytoma (SHP) and tumors of the (conventional) hemangiopericytoma/solitary fibrous tumor family (HP/SFT) are ..
  5. Schiariti M, Goetz P, El Maghraby H, Tailor J, Kitchen N. Hemangiopericytoma: long-term outcome revisited. Clinical article. J Neurosurg. 2011;114:747-55 pubmed publisher
    ..With the aim of determining the outcome and response to various treatment modalities, a series of 39 patients who underwent microsurgical resection for primary meningeal hemangiopericytoma over a 24-year period is presented.
  6. Higashi K, Nakaya K, Watanabe M, Ikeda R, Suzuki T, Oshima T, et al. Glomangiopericytoma of the nasal cavity. Auris Nasus Larynx. 2011;38:415-7 pubmed publisher
    ..Glomangiopericytoma is categorized as a borderline low malignancy tumor, which tends to recurrence. Strict follow-up is required, especially if complete resection is not achieved...
  7. Shidoh S, Yoshida K, Takahashi S, Mikami S, Mukai M, Kawase T. Parasagittal solitary fibrous tumor resembling hemangiopericytoma. Brain Tumor Pathol. 2010;27:35-8 pubmed publisher
    ..We report the case of a Japanese woman with parasagittal SFT that resembled hemangiopericytoma (HPC)...
  8. Acioglu E, Cansiz H, Mercan H, Dervisoglu S. Head and neck hemangiopericytomas: diagnostic contradictions. J Craniofac Surg. 2009;20:930-5 pubmed publisher
    ..To identify misdiagnostic points of hemangiopericytomas (HPs) of the head and neck...
  9. Iwai Y, Yamanaka K. Gamma knife radiosurgery for other primary intra-axial tumors. Prog Neurol Surg. 2009;22:129-41 pubmed publisher
    ..Although the prognosis is poor for PCNSL patients, gamma knife radiosurgery, even with a relatively low tumor margin dose, is an effective treatment for controlling PCNSL...

More Information

Publications65

  1. Rutkowski M, Bloch O, Jian B, Chen C, Sughrue M, Tihan T, et al. Management of recurrent intracranial hemangiopericytoma. J Clin Neurosci. 2011;18:1500-4 pubmed publisher
    Intracranial hemangiopericytoma (HPC) is an aggressive meningothelial neoplasm. A particularly challenging aspect of management of patients with HPC is optimizing treatment for recurrence, progression, and extracranial metastasis...
  2. Tsirevelou P, Chlopsidis P, Zourou I, Valagiannis D, Skoulakis C. Hemangiopericytoma of the neck. Head Face Med. 2010;6:23 pubmed publisher
    b>Hemangiopericytoma (HPC) is an exceedingly rare tumor of uncertain malignant potential...
  3. Rutkowski M, Sughrue M, Kane A, Aranda D, Mills S, Barani I, et al. Predictors of mortality following treatment of intracranial hemangiopericytoma. J Neurosurg. 2010;113:333-9 pubmed publisher
    Intracranial hemangiopericytoma (HPC) is a rare and malignant extraaxial tumor with a high proclivity toward recurrence and metastasis...
  4. Fountoulakis E, Papadaki E, Panagiotaki I, Giannikaki E, Lagoudianakis G, Bizakis J. Primary haemangiopericytoma of the parapharyngeal space: an unusual tumour and review of the literature. Acta Otorhinolaryngol Ital. 2011;31:194-8 pubmed
    ..The treatment of choice is radical excision. The follow-up includes clinical evaluation every 6 months and annual magnetic resonance imaging for at least 3 years...
  5. Palacios E, Restrepo S, Mastrogiovanni L, Lorusso G, Rojas R. Sinonasal hemangiopericytomas: clinicopathologic and imaging findings. Ear Nose Throat J. 2005;84:99-102 pubmed
    ..We describe our brief retrospective review of 7 histologically proven cases of sinonasal hemangiopericytoma, and we discuss the imaging characteristics and clinical and pathologic findings in these patients.
  6. Zentar A, Sall I, Ali A, Bouchentouf S, Quamous M, Chahdi H, et al. Sacral hemangiopericytoma involving the retrorectal space: report of a case. Surg Today. 2009;39:344-8 pubmed publisher
    A primary hemangiopericytoma (HP) of the bone is rare, because the vast majority of these tumors arise in soft tissue. This report presents a case of a hemangiopericytoma in the sacrum (S1-S2) with extension to the retrorectal space...
  7. Guerrissi J, Miranda M, Olivier R. Giant hemangiopericytoma of mandible: a propos of a case: a variant of the surgical technique for protection of the articular fosse. J Craniofac Surg. 2006;17:523-7 pubmed
    The hemangiopericytoma is a tumor of the pericytes. It represents 1% of vascular tumors. It is frequently located in inferior limbs, the pelvis, and the retroperitoneum. A painless mass of slow growth is main presentation...
  8. Sakellaridis N, Mahera H, Pomonis S. Hemangiopericytoma-like synovial sarcoma of the lumbar spine. Case report. J Neurosurg Spine. 2006;4:179-82 pubmed
    ..included in the differential diagnosis of tumors originating from the lumbar spine, especially if they show hemangiopericytoma-like pathological characteristics...
  9. Bunai Y, Akaza K, Tsujinaka M, Nakamura I, Nagai A, Jiang W, et al. Sudden death due to undiagnosed intracranial hemangiopericytoma. Am J Forensic Med Pathol. 2008;29:170-2 pubmed publisher
    ..An internal examination revealed severe pulmonary edema and hemorrhagic hemangiopericytoma arising from the choroid plexus of the right lateral ventricle...
  10. Breitschwerdt E, Maggi R, Varanat M, Linder K, Weinberg G. Isolation of Bartonella vinsonii subsp. berkhoffii genotype II from a boy with epithelioid hemangioendothelioma and a dog with hemangiopericytoma. J Clin Microbiol. 2009;47:1957-60 pubmed publisher
    ..berkhoffii genotype II from a boy with epithelioid hemangioendothelioma and a dog with hemangiopericytoma. These results suggest that B. vinsonii subsp...
  11. Annunziato M, Alessio A, Stefano M, Massimiliano G, Marco G, Carmelo A, et al. Hemangiopericytoma in pregnancy: a case report. J Neurooncol. 2005;73:277-8 pubmed
  12. Chang S, Sakamoto G. The role of radiosurgery for hemangiopericytomas. Neurosurg Focus. 2003;14:e14 pubmed
    ..Resection is the standard treatment in most, although regrowth and metastases are common even after resection. The authors evaluate the role of stereotactic radiosurgery in the treatment of recurrent hemangiopericytomas...
  13. Lawson E, Zhang X, Crocker J, Wang W, Klibanski A. Hypoglycemia from IGF2 overexpression associated with activation of fetal promoters and loss of imprinting in a metastatic hemangiopericytoma. J Clin Endocrinol Metab. 2009;94:2226-31 pubmed publisher
    ..The mechanism of IGF2 overexpression in non-islet-cell tumor hypoglycemia is not understood...
  14. Olson C, Yen C, Schlesinger D, Sheehan J. Radiosurgery for intracranial hemangiopericytomas: outcomes after initial and repeat Gamma Knife surgery. J Neurosurg. 2010;112:133-9 pubmed publisher
    Intracranial hemangiopericytoma is a rare CNS tumor that exhibits a high incidence of local recurrence and distant metastasis...
  15. Johnson D, Kimmel D, Burch P, Cascino T, Giannini C, Wu W, et al. Phase II study of subcutaneous octreotide in adults with recurrent or progressive meningioma and meningeal hemangiopericytoma. Neuro Oncol. 2011;13:530-5 pubmed publisher
    ..and safety of subcutaneous octreotide therapy for the treatment of recurrent meningioma and meningeal hemangiopericytoma. Octreotide is an agonist of somatostatin receptors, which are frequently expressed in meningioma, and ..
  16. Horikawa Kyo Y, Tanaka T, Tanano H, Kitayama Y, Karakawa S, Taniyama K. Mediastinal hemangiopericytoma. Pediatr Blood Cancer. 2009;53:206-7 pubmed publisher
    Mediastinal hemangiopericytoma (HPC) was diagnosed in a 3-year-old female. The incidence of this tumor is rare in children, and few data are available to guide clinical management...
  17. Schweizer L, Koelsche C, Sahm F, Piro R, Capper D, Reuss D, et al. Meningeal hemangiopericytoma and solitary fibrous tumors carry the NAB2-STAT6 fusion and can be diagnosed by nuclear expression of STAT6 protein. Acta Neuropathol. 2013;125:651-8 pubmed publisher
    Non-central nervous system hemangiopericytoma (HPC) and solitary fibrous tumor (SFT) are considered by pathologists as two variants of a single tumor entity now subsumed under the entity SFT...
  18. Fujita I, Kiyama T, Chou K, Kanno H, Naito Z, Uchida E. A case of metastatic hemangiopericytoma occurring 16 years after initial presentation: with special reference to the clinical behavior and treatment of metastatic hemangiopericytoma. J Nippon Med Sch. 2009;76:221-5 pubmed
    ..Therefore, the tumor was diagnosed as a metastatic hemangiopericytoma with malignant potential...
  19. Ambrosini Spaltro A, Eusebi V. Meningeal hemangiopericytomas and hemangiopericytoma/solitary fibrous tumors of extracranial soft tissues: a comparison. Virchows Arch. 2010;456:343-54 pubmed publisher
    ..A more aggressive phenotype of the tumor together with incomplete surgical resection of intracranial lesions might explain the noticeable clinical difference between HPC of the meninges and HPC-SFT of soft tissues...
  20. Angouridakis N, Zaraboukas T, Vital J, Vital V. Sinonasal hemangiopericytoma of the middle turbinate: a case report and brief review of the literature. B-ENT. 2007;3:139-43 pubmed
    ..We will also discuss the epidemiology, the macro- and microscopical characteristics, the clinical and pathological findings and the treatment of this particular neoplasia...
  21. Santillan A, Zink W, Lavi E, Boockvar J, Gobin Y, Patsalides A. Endovascular embolization of cervical hemangiopericytoma with Onyx-18: case report and review of the literature. J Neurointerv Surg. 2011;3:304-7 pubmed publisher
    Cervical hemangiopericytoma (HPC) is a rare tumor involving dura and bone...
  22. Carvalho J, Haddad L, Leonhardt F, Marques Filho M, Santos R, Cervantes O, et al. Head and neck hemangiopericytoma in a child: case report. Sao Paulo Med J. 2004;122:223-6 pubmed
    b>Hemangiopericytoma is a relatively rare tumor, first described in 1942, with approximately 300 cases described in the literature to date. In most cases, it affects the trunk and lower extremities...
  23. Brass S, Guiot M, Albrecht S, Glikstein R, Mohr G. Metastatic hemangiopericytoma presenting as an epidural spinal cord lesion. Can J Neurol Sci. 2004;31:550-3 pubmed
    b>Hemangiopericytoma is an aggressive vascular tumour that rarely affects the central nervous system and is even more rarely spinal in presentation...
  24. Wilson T, Hellquist H, Ray S, Pickles J. Intranasal myopericytoma. A tumour with perivascular myoid differentiation: the changing nomenclature for haemangiopericytoma. J Laryngol Otol. 2007;121:786-9 pubmed
    ..The treatment of choice is surgical excision with further excisions for local recurrence...
  25. Taglialatela Scafati C, D Antonio A, Taglialatela Scafati S, Scotto Di Clemente S, Parascandolo S. Glomangiopericytoma of the pterygomandibular space: an unusual case. Br J Oral Maxillofac Surg. 2007;45:673-5 pubmed
    ..The lesion is classified as a separate variant from the classic haemangiopericytoma, which is characterised by more aggressive biological behaviour...
  26. Aliberti C, Benea G, Kopf B, De Giorgi U. Hepatic metastases of hemangiopericytoma: contrast-enhanced MRI, contrast-enhanced ultrasonography and angiography findings. Cancer Imaging. 2006;6:56-9 pubmed
    b>Hemangiopericytoma is a rare and characteristically hypervascular tumour...
  27. Williams H, Gossage J, Allred T, Kallab A, Pancholy A, Anstadt M. F-18 FDG positron emission tomography imaging of rare soft tissue sarcomas: low-grade fibromyxoid sarcoma and malignant hemangiopericytoma. Clin Nucl Med. 2004;29:581-4 pubmed
  28. Mohammadianpanah M, Torabinejad S, Bagheri M, Omidvari S, Mosalaei A, Ahmadloo N. Primary epidural malignant hemangiopericytoma of thoracic spinal column causing cord compression: case report. Sao Paulo Med J. 2004;122:220-2 pubmed
    b>Hemangiopericytoma is an uncommon mesenchymal neoplasm that rarely affects the spinal canal. Primary malignant hemangiopericytoma of the spinal column is extremely rare.
  29. Martinez Trufero J, Alfaro J, Felipo F, Alvarez M, Madani J, Cebollero A. Response to trabectedin treatment in a highly pretreated patient with an advanced meningeal hemangiopericytoma. Anticancer Drugs. 2010;21:795-8 pubmed publisher
    Meningeal hemangiopericytoma is an uncommon and aggressive malignancy that, in contrast to meningiomas, shows a high propensity for local recurrence and the development of late extraneural metastases...
  30. Yilmazlar T, Kirdak T, Yerci O, Adim S, Kanat O, Manavoglu O. Splenic hemangiopericytoma and serosal cavernous hemangiomatosis of the adjacent colon. World J Gastroenterol. 2005;11:4111-3 pubmed
    ..One of them was excised. Histologic examination showed hemangiopericytoma of the spleen and cavernous hemangioma of the adjacent colon...
  31. Mulamalla K, Truskinovsky A, Dudek A. Rare case of hemangiopericytoma responds to sunitinib. Transl Res. 2008;151:129-33 pubmed publisher
    b>Hemangiopericytoma (HP) is a rare mesenchymal tumor associated with the capillary wall...
  32. Domont J, Massard C, Lassau N, Armand J, Le Cesne A, Soria J. Hemangiopericytoma and antiangiogenic therapy: clinical benefit of antiangiogenic therapy (sorafenib and sunitinib) in relapsed malignant haemangioperyctoma /solitary fibrous tumour. Invest New Drugs. 2010;28:199-202 pubmed publisher
  33. Takahashi Y, Shimizu S, Sakurai S, Kumagai A, Mori S, Fukusato T. Gastrointestinal stromal tumor in the duodenum exhibiting hemangiopericytoma-like histological pattern. Pathol Int. 2009;59:98-101 pubmed publisher
    Reported herein is a gastrointestinal stromal tumor (GIST) that exhibited a hemangiopericytoma (HPC)-like histological pattern. Such a morphological variant of GIST has not been described previously...
  34. Taniura S, Taniguchi M, Mizutani T, Takahashi H. Metastatic hemangiopericytoma to the cauda equina: a case report. Spine J. 2007;7:371-3 pubmed
    b>Hemangiopericytoma is an aggressive tumor associated with high recurrence and metastasis. Metastases are usually delayed, long after diagnosis of the primary lesion. Metastatic hemangiopericytoma to the spinal cord is especially rare.
  35. Hayashi Y, Uchiyama N, Hayashi Y, Nakada M, Iwato M, Kita D, et al. A reevaluation of the primary diagnosis of hemangiopericytoma and the clinical importance of differential diagnosis from solitary fibrous tumor of the central nervous system. Clin Neurol Neurosurg. 2009;111:34-8 pubmed publisher
    ..We also compared the clinical features of these cases...
  36. Kano H, Niranjan A, Kondziolka D, Flickinger J, Lunsford L. Adjuvant stereotactic radiosurgery after resection of intracranial hemangiopericytomas. Int J Radiat Oncol Biol Phys. 2008;72:1333-9 pubmed publisher
  37. Brar R, Kulkarni S, Sheikh S, Jindal S, Brar P. Hemangiopericytoma associated with multiple keratocystic odontogenic tumors in an adolescent patient: a case report. J Oral Sci. 2008;50:233-7 pubmed
    b>Hemangiopericytoma, initially described by Stout and Murray in 1942 (1), is a rare vascular tumor arising from mesenchymal cells with pericytic differentiation...
  38. Park M, Patel S, Ludwig J, Trent J, Conrad C, Lazar A, et al. Activity of temozolomide and bevacizumab in the treatment of locally advanced, recurrent, and metastatic hemangiopericytoma and malignant solitary fibrous tumor. Cancer. 2011;117:4939-47 pubmed publisher
    ..An optimal systemic treatment strategy for advanced HPC/SFT has not yet been identified...
  39. Furusato E, Valenzuela I, Fanburg Smith J, Auerbach A, Furusato B, Cameron J, et al. Orbital solitary fibrous tumor: encompassing terminology for hemangiopericytoma, giant cell angiofibroma, and fibrous histiocytoma of the orbit: reappraisal of 41 cases. Hum Pathol. 2011;42:120-8 pubmed publisher
    ..3% of cases to 5% to 10% in 20% of cases. Taken together, the findings of this study suggest that orbital hemangiopericytoma and some cases previously designated as fibrous histiocytoma, giant cell angiofibroma of orbit, and solitary ..
  40. Tessema B, Eloy J, Folbe A, Anstead A, Mirani N, Jourdy D, et al. Endoscopic management of sinonasal hemangiopericytoma. Otolaryngol Head Neck Surg. 2012;146:483-6 pubmed publisher
    ..Increased experience with endoscopic management of benign and malignant sinonasal tumors has led to a shift in management of SNHPC. The authors present their experience in the largest series of patients with SNHPC managed endoscopically...
  41. Tashjian V, Khanlou N, Vinters H, Canalis R, Becker D. Hemangiopericytoma of the cerebellopontine angle: a case report and review of the literature. Surg Neurol. 2009;72:290-5 pubmed publisher
    Intracranial hemangiopericytoma represents a rare intracranial tumor that is typically difficult to distinguish from meningioma based on clinical presentation and radiographic findings...
  42. Suzuki S, Wanifuchi H, Shimizu T, Kubo O. Hemangiopericytoma in the lateral ventricle. Neurol Med Chir (Tokyo). 2009;49:520-3 pubmed
    A 31-year-old female presented with a particularly rare hemangiopericytoma (HPC) in the right lateral ventricle manifesting as a 6-month history of visual disturbance and headache...
  43. Dozois E, Malireddy K, Bower T, Stanson A, Sim F. Management of a retrorectal lipomatous hemangiopericytoma by preoperative vascular embolization and a multidisciplinary surgical team: report of a case. Dis Colon Rectum. 2009;52:1017-20 pubmed publisher
    ..We report an unusual case of a massive retrorectal lipomatous hemangiopericytoma managed successfully by preoperative vascular embolization and a multidisciplinary surgical team...
  44. Park M, Araujo D. New insights into the hemangiopericytoma/solitary fibrous tumor spectrum of tumors. Curr Opin Oncol. 2009;21:327-31 pubmed publisher
    This review provides an overview of the hemangiopericytoma/solitary fibrous tumor (HPC/SFT) spectrum of tumors, focusing on the histopathologic characteristics, clinical features, diagnosis, and treatment of HPC/SFT.
  45. Anaforoglu I, Simsek A, Turan T, Algun E. Hemangiopericytoma-associated hypoglycemia improved by glucocorticoid therapy: a case report. Endocrine. 2009;36:151-4 pubmed publisher
    ..He had multiple metastases from a meningeal hemangiopericytoma, which had been operated on 12 years earlier...
  46. Khadgawat R, Singh Y, Kansara S, Tandon N, Bal C, Seith A, et al. PET/CT localisation of a scapular haemangiopericytoma with tumour-induced osteomalacia. Singapore Med J. 2009;50:e55-7 pubmed
    ..PET/CT was helpful in the localisation of the tumour which, when surgically removed, resulted in the normalisation of biochemical parameters with clinical improvement...
  47. Oktem F, Karaman E, Mamak A, Yilmaz S, Erdamar S. Hemangiopericytoma of the parotid gland: a case report. Kulak Burun Bogaz Ihtis Derg. 2007;17:112-5 pubmed
    ..Superficial parotidectomy was performed. Histopathological diagnosis was made as hemangiopericytoma. No evidence for local recurrence or distant metastasis was seen within a follow-up of 36 months.
  48. Shiba H, Misawa T, Kobayashi S, Yokota T, Son K, Yanaga K. Hemangiopericytoma of the greater omentum. J Gastrointest Surg. 2007;11:549-51 pubmed
    ..Histological findings confirmed a diagnosis of hemangiopericytoma with low-grade malignancy...
  49. Rajaram V, Brat D, Perry A. Anaplastic meningioma versus meningeal hemangiopericytoma: immunohistochemical and genetic markers. Hum Pathol. 2004;35:1413-8 pubmed
    ..3) The characteristic FXIIIa staining pattern reported for HPC also is encountered frequently in anaplastic meningiomas and therefore is nonspecific in this diagnostic setting...
  50. Sheehan J, Kondziolka D, Flickinger J, Lunsford L. Radiosurgery for treatment of recurrent intracranial hemangiopericytomas. Neurosurgery. 2002;51:905-10; discussion 910-1 pubmed
    ..Despite local tumor control, patients are still at risk for distant metastasis. Diligent clinical and radiological follow-up monitoring is necessary. ..
  51. Kim J, Jung H, Kim Y, Kim C, Hwang S, Paek S, et al. Meningeal hemangiopericytomas: long-term outcome and biological behavior. Surg Neurol. 2003;59:47-53; discussion 53-4 pubmed
    ..Clinical records and radiologic findings of 31 cases with meningeal hemangiopericytoma treated at Seoul National University Hospital and Asian Medical Center between 1982 and 1999 were carefully ..
  52. Yilmaz E, Akkoclu A, Kargi A, Sevinc C, Komus N, Catalyurek H, et al. Radiography, Doppler sonography, and MR angiography of malignant pulmonary hemangiopericytoma. AJR Am J Roentgenol. 2003;181:1079-81 pubmed
  53. Woitzik J, Sommer C, Krauss J. Delayed manifestation of spinal metastasis: a special feature of hemangiopericytoma. Clin Neurol Neurosurg. 2003;105:159-66 pubmed
    Metastatic hemangiopericytoma to the spine is rare, and operative management of these highly vascularized tumors is challenging. Review of the literature identified only seven previously reported cases...
  54. Vadlamani I, Ma E, Brink D, Batanian J. Trisomy 15 in a case of pediatric hemangiopericytoma and review of the literature. Cancer Genet Cytogenet. 2002;138:116-9 pubmed
    This study reports on a pediatric case of hemangiopericytoma (HPC) showing trisomy 15 as a sole anomaly. Trisomy 15 was observed in a total of 11 cells harvested at a very early passage from two different in-situ cultures...
  55. Kowalski P, Paulino A. Proliferation index as a prognostic marker in hemangiopericytoma of the head and neck. Head Neck. 2001;23:492-6 pubmed
    b>Hemangiopericytoma (HPC) of the head and neck is a rare neoplasm whose biologic behavior is difficult to predict by means of conventional histologic parameters.
  56. Chin L, Rabb C, Hinton D, Apuzzo M. Hemangiopericytoma of the temporal bone presenting as a retroauricular mass. Neurosurgery. 1993;33:728-31; discussion 731-2 pubmed
    An unusual case of a hemangiopericytoma arising from the temporal bone is presented. The patient was noted to have a postauricular mass and was neurologically asymptomatic...