CONTEXT 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. The head and neck incidence is less than 20%, mostly in adults. We describe a case of malignant head and neck hemangiopericytoma in a child. TYPE OF STUDY Case report. CASE REPORT A twelve...

In the present study, we describe a subcutaneous mass between the left flank and hip in a 2-year-old male Great Dane dog. Histopathologically, cells appeared to be spindle shaped around a central capillary together with a fingerprint pattern. Immunohistochemical analysis presented that the neoplastic cells expressed vimentin, but did not stain for S-100 protein. On the basis of histopathology a...

Subject. A 27-year-old Hispanic male with clinical manifestation of neurofibromatosis type 1 developed chronic constipation and urination difficulty along with recently increased abdominal bloating and anorexia. He also noted 40 lbs weight loss over period of 1 year. Physical and radiographic examinations revealed a large mass in the right pelvic fossa.Results. The surgically removed tumor was ...

Primary pulmonary hemangiopericytoma is a very rare tumor. A case of the disease is reported, together with a review of the literature. The patient was a 78-year-old male, who was admitted to hospital with an abnormal shadow on his chest x-ray. A primary tumor, located in the left S4, was resected, and a final diagnosis of hemangiopericytoma of pulmonary origin was made. The disease recurred in...

Various malignant tumors of the liver, especially liver angiosarcoma, have been described after occupational exposure to vinyl chloride monomer. We present the case records and pathologic findings of two plastic industry workers who had been exposed to high concentrations of vinyl chloride. These workers developed hepatic neoplasms, angiosarcoma, or hemangiopericytoma. We discuss the histogenes...

Hemangiopericytoma is a malignant vascular tumour of soft tissue. Microscopically, the tumour shows tightly packed cellular areas surrounding thin-walled branching blood vessels. Traditionally these tumours are treated using wide surgical excision. Only a very few cases of hemangiopericytoma of the prostate have been described worldwide. The feasibility of managing such a case with a combinatio...

Hemangiopericytoma (HPC) is a mesenchymal tumour that may be benign, malignant, or occur in an intermediate form. We report an unusual case of hemangiopericytoma located in the buccal mucosal region. The histopathologic features showed increased cellularity, necrosis, hemorrhage, low proliferation index, and 4 or less mitotic figures per 10 high-power fields. Since this histological pattern sug...

Hemangiopericytoma is a rare primary tumor originating from Zimmerman's pericytes, with significant metastatic potential. Hepatic metastatic disease requires an aggressive approach by a multidisciplinary team of dedicated oncology specialists, to prolong survival in selected patients. We report on a patient with recurrent hepatic metastases of grade II intracranial hemangiopericytoma 5 years af...