Intracranial hemangiopericytoma is unusual, and those occurring in the posterior fossa is extremely rare; we report such a rare case of hemangiopericytoma of the posterior fossa. The radiologic findings and gross characteristics of hemangiopericytomas are sometimes quite similar to those of meningiomas. Although extremely rare, the operator should be aware of the existence of this disorder to dexterously manage the aggressive nature and high vascular tendency of hemangiopericytomas. The radiological features and histological findings in this case are discussed in this study.
Hemangiopericytoma* ; Meningioma

No abstract available.
Hemangiopericytoma* ; Lung*

Doege-Potter syndrome (DPS) is a rare paraneoplastic condition characterized by hypoinsulinemic hypoglycemia from a solitary fibrous tumor. The underlying mechanism is the secretion of a prohormone form of insulin-like growth factor II (IGF-II) by the tumor, which causes decreased release of glucose into the circulation. We report the case of a 27-year-old Filipino male with presumptive DPS from a recurrent right temporo-zygomatic hemangiopericytoma (HPC). The complexity of DPS requires a multidisciplinary approach. Early screening for metastases from HPC may prevent the undesirable sequelae of the disease process.
Hemangiopericytoma ; Hypoglycemia

No abstract available.
Hemangiopericytoma ; Nasolabial Fold

Hemangiopericytoma is an uncommon mesenchymal neoplasm that may occur anywhere in the body but is most commonin the lower extremities and retroperitoneum. Radiologically, the tumor is mainly a solid hypervascular mass, andwhen large, has some cystic and necrotic portions. It can compress or displace adjacent tissue and organs, and maycause related symptoms. The authors encountered a case of hemangiopericytoma of the popliteal fossa as amultichambered cystic mass containing various-staged hemorrhagic fluid, and report this case together with its MRimaging findings.
Hemangiopericytoma* ; Lower Extremity

Hemangiopericytoma is an uncommon mesenchymal tumor that may be benign or malignant. This tumor is composed of proliferating capillaries and spindle-shaped cells known as the pericytes of Zimmermann. Since all capillaries have pericytes, hemangiopericytoma can be found anywhere In the body. We report a case of malignant hemangiopericytoma in the pelvic cavity which was treated by radical excision and adjutant radiotherapy and discuss the clinicopathological feature, prognosis, and therapy of this lesson.
Capillaries ; Hemangiopericytoma* ; Pericytes ; Prognosis ; Radiotherapy

Primary intracranial hemangiopericytoma is rare and resemble meningioma on imaging study. It shows meningeal attachment, and is usually isointense with gray matter on T1-weighted MR image with heterogeneous enhancement and prominent vascular flow voids on T2-weighted image. Cystic type of hemangiopericytoma is very rare and only 3 cases have been reported in the literature which arised in the middle fossa, cerebellum, and occipital area. Ventricular hemangiopericytomas were reported in 9 cases, and all of them were solid type. Authors experienced a peculiar case of cystic hemangiopericytoma in the 3rd ventricle and report it with review of the literature.
Cerebellum ; Hemangiopericytoma* ; Meningioma ; Third Ventricle*

OBJECTIVE: Preoperative endovascular embolization of intracranial tumors is performed to mitigate anticipated intraoperative blood loss. Although the usage of a wide array of embolic agents, particularly polyvinyl alcohol (PVA), has been described for a variety of tumors, literature detailing the efficacy, safety and complication rates for the usage of Onyx is relatively sparse. MATERIALS AND METHODS: We reviewed our single institutional experience with pre-surgical Onyx embolization of extra-axial tumors to evaluate its efficacy and safety and highlight nuances of individualized cases. RESULTS: Five patients underwent pre-surgical Onyx embolization of large or giant extra-axial tumors within 24 hours of surgical resection. Four patients harbored falcine or convexity meningiomas (grade I in 2 patients, grade II in 1 patient and grade III in one patient), and one patient had a grade II hemangiopericytoma. Embolization proceeded uneventfully in all cases and there were no complications. CONCLUSION: This series augments the expanding literature confirming the safety and efficacy of Onyx in the preoperative embolization of extra-axial tumors, underscoring its advantage of being able to attain extensive devascularization via only one supplying pedicle.
Hemangiopericytoma ; Humans ; Meningioma ; Polyvinyl Alcohol

Renal hemangiopericytoma is rare. It seems to be slowly progressive and grows locally with firm consistency, well encapsulation and may infiltrate surrounding tissue, but degree of malignancy appears to be low. A case of hemangiopericytoma developed from right kidney in 52 years old man was presented with a brief review of literature.
Hemangiopericytoma* ; Humans ; Kidney ; Middle Aged

In a 24 -year -old woman, a tumor was detected unexpectedly under the left flank of the body in an examination. Ultrasound found the tumor on the retro-peritoneum, UIV showed the less absorption of medicament in the right side of the kidney, which was pushed up and the normal function of left side of the kidney. In operation, a retro-peritoneal tumor was exposed at the right side with a bulk of surrounded large vessels. Pathologic anatomy showed that it was a malign hemangiopericytoma. One year after the operation, patient survived normally.
Hemangiopericytoma ; Therapeutics ; Diagnosis ; Peritoneum ; Case report