FDG PET for giant cavernous hemangioma: important clue to differentiate from a malignant vascular tumor in the liver

Giant cavernous hemangioma of the liver sometimes has a very inhomogeneous appearance with intratumoral degeneration on computed tomography or magnetic resonance imaging, and may mimic a malignant hepatic tumor, including angiosarcoma. There are many reports about F-18 fluorodeoxyglucose (FDG) uptake of angiosarcoma; however, knowledge regarding positron emission tomography findings with FDG for giant hepatic cavernous hemangioma is still limited. We herein present 2 cases of giant hepatic cavernous hemangioma in which low FDG uptake was considered helpful to differentiate from malignant hepatic tumor.     

Angiosarcoma of the liver mimicking cavernous hemangioma on dynamic CT

A case of hepatic angiosarcoma showed findings similar to those of cavernous hemangioma on dynamic CT, angiography, and magnetic resonance imaging. The tumor was histologically confirmed as angiosarcoma of cavernous pattern.     

Spontaneous rupture of a necrotic hepatic angiosarcoma: findings on dual-phase computed tomography and angiography

We present dual-phase computed tomographic (CT) and angiographic findings of a ruptured hepatic angiosarcoma. These tumors can be divided into two types: those with and those without gross central necrosis with hemorrhage. In our case, the tumor had gross central necrosis, and CT and angiographic findings showed a small number of areas with a centripetal enhancement pattern and the rest of the tumor with avascular areas. We found that dual-phase CT and angiographic findings are able to distinguish angiosarcoma, which mimics a hemangioma, as these lesions show avascular areas that reflect a mass with gross central necrosis.     

Hepatic angiosarcoma: findings on multiphasic contrast-enhanced helical CT do not mimic hepatic hemangioma

OBJECTIVE: The objective of our study was to identify multiphasic contrast-enhanced helical CT findings of angiosarcoma of the liver to determine whether this tumor could be confused with hemangioma of the liver. CONCLUSION: Angiosarcoma of the liver is a multifocal tumor with a variety of findings on multiphasic contrast-enhanced helical CT. None of the findings would usually be confused with the typical findings of hepatic hemangioma.     

Histiocytoid hemangioma of bone: A benign lesion which may mimic angiosarcoma

Histiocytoid hemangioma is a related family of endothelial cell neoplasms, which was described by Rosai et al. [14] in 1979 and which encompasses a group of osseous, vascular and cutaneous neoplasms. These neoplasms bear a close resemblance to the angiosarcoma/hemangioendothelioma family of malignant neoplasms. A case of histiocytoid hemangioma is reported that presented as a multicentric osseous lesion and was initially diagnosed as angiosarcoma. The patient has had a remarkably benign course and at a later date developed skin and bone lesions diagnosed as angiolymphoid hyperplasia with eosinophilia identical to the initial lesion. This represents the first reported case of identical osseous and cutaneous lesions of the histiocytoid hemangioma group in the same patient and lends credence to Rosai's concept. A review of the literature concerning angiosarcoma/hemangioendothelioma of the bone is presented with the conclusion that some lesions considered to represent multicentric angiosarcoma may represent the more benign histiocytoid hemangioma.     

Primary pleural epithelioid angiosarcoma manifesting as a loculated hemothorax: A case report and literature review focusing on CT findings

Primary pleural angiosarcoma (PPA) is an extremely rare and clinically aggressive tumor. We report the case of a 66-year-old man having PPA with chest computed tomography (CT) scan showing a large oval-shaped, nonenhancing high attenuation cystic mass in the left hemithorax. Morphological and immunohistochemical findings supported the diagnosis of epithelioid angiosarcoma. Pleural angiosarcoma should be considered in the differential diagnosis of spontaneous hemothorax manifesting as high attenuation loculated pleural fluid on CT.     

Angiosarcoma: unusual cause of acute abdominal pain and hemoperitoneum

Spontaneous rupture of primary angiosarcoma of the spleen is an uncommon cause of acute abdominal pain and hemoperitoneum. Clinical findings and presentation are nonspecific and variable. CT is frequently used as a first-line imaging modality in the evaluation of acute abdominal pain; however, findings are not specific for angiosarcoma. We report a case of primary splenic angiosarcoma with spontaneous rupture, hemoperitoneum, and hepatic metastases in a patient presenting to the emergency department with acute left upper quadrant pain and fever.     

CT and MR findings of splenic angiosarcoma.

A surgically confirmed primary splenic angiosarcoma is described. Although angiography showed most of the characteristic findings of the present patient, MR imaging provided a useful information as a supplemental tool. The tumor demonstrated low-signal intensity on both T1- and T2-weighted images, which might differ from hemangioma findings. Subacute hemorrhage within the tumor was revealed by MR imaging, suggesting the way in which the tumor grew during a short period of time. This finding was different from reported angiosarcoma MR findings of siderotic nodules within the tumor. After the administration of Gd-DTPA, MR images clearly demonstrated heterogeneous enhancement within the tumor, which corresponded to the pathologic findings of solid parenchyma with necrotic tissues.     

Intraorbital lobular capillary hemangioma (pyogenic granuloma)

A 44-year-old man with a history of a foreign body in his right eye visited our hospital. On computed tomography a well-enhanced mass with low attenuation septal walls and a capsule was detected in the right orbit. On magnetic resonance imaging the mass showed inhomogenous high intensity on T2-weighted images and low intensity on diffusion-weighted images. The mass was histopathologically diagnosed as a lobular capillary hemangioma. This is the first report about image findings of lobular capillary hemangioma in the orbit.     

Diffuse Hepatic Hemangiomatosis without Extrahepatic Involvement in an Adult Patient

We report an extremely rare case of a diffuse hepatic hemangiomatosis without extrahepatic involvement in an adult. The imaging findings of this tumor were similar to those of a hepatic hemangioma and included contrast enhancement with a centripetal filling pattern of the entire hepatic tumor on the delayed phase of a dynamic CT and inhomogeneous diffuse uptake of the entire tumor on blood-pool images obtained five hours later on a 99mTc-labeled red blood cell scan. Despite its rarity, diffuse hepatic hemangiomatosis can be suggested in adult patients with diffusely involved hepatic tumors showing the radiological findings of a hepatic hemangioma.     

MR features of angiosarcoma in a patient with Maffucci's syndrome

Maffucci's syndrome is a rare sporadic congenital disorder associated with multiple enchondromas and soft tissue hemangiomas. These bone and soft tissue tumors have the potential of malignant transformation to various histologic types: chondrosarcoma, osteosarcoma, fibrosarcoma, and angiosarcoma. We report a rare case of Maffucci's syndrome with soft tissue angiosarcoma of the leg to illustrate MRI findings with pathologic correlations.     

Dumbbell-shaped epidural capillary hemangioma

We report a case of a purely epidural capillary hemangioma of the thoracic spine with foraminal extension. Epidural hemangiomas are rare; only a few cases of dumbbell-shaped ones have been reported, and all were cavernous. MR imaging showed characteristic findings of a capillary hemangioma, which are also consistent with other epidural lesions such as neuromas or meningiomas.     

Computed tomography features of pulmonary metastases from angiosarcoma: Lessons learned from one case study

A distinctive feature of some angiosarcomas is that two or more atypical forms of pulmonary metastases may be detected concomitantly. In this case report, we present a 37-year-old man diagnosed with angiosarcoma of the neck, with extreme diversity of lung metastases on chest computed tomography (CT). We analyzed CT features of metastases and discussed possible reasons for their pleomorphism, as well as clinical implications of these findings.     

Intravenous pyogenic granuloma or intravenous lobular capillary hemangioma

Lobular capillary hemangioma is a vascular neoplasm that commonly occurs as a cutaneous tumor. When it involves the skin and mucosal surfaces, ulceration and suppuration may occur, hence the classic term of pyogenic granuloma. Intravenous pyogenic granuloma is a rare solitary form of lobular capillary hemangioma that usually occurs in the veins of the neck and upper extremities. We report the ultrasonographic and magnetic resonance imaging findings of a pyogenic intravenous granuloma localized in the right cephalic vein. The imaging and pathological findings and the differential diagnoses are discussed.     

Angiomatous skeletal lesions

Vascular lesions involving osseous structures are relatively common neoplasms. We will review the appearance of many musculoskeletal angiomatous lesions using the multimodality approach. Lesions to be discussed include osseous hemangioma, glomus tumor, angiomatosis and associated syndromes (Osler-Weber-Rendu, Klippel-Trenaunay-Weber, and Kasabach-Merritt), Gorham, tumor-induced osteomalacia, and aggressive vascular neoplasms (hemangioendothelioma, hemangiopericytoma, and angiosarcoma).     

Imaging features of uncommon adrenal masses with histopathologic correlation.

Uncommon adrenal masses include cystic lesions (hydatid cyst, endothelial cyst), solid lesions (hemangioma, ganglioneuroma, angiosarcoma, primary malignant melanoma), and solid fatty lesions (myelolipoma, collision tumor). Most of these lesions do not have specific imaging features. The liquid content of adrenal cysts is clearly demonstrated on ultrasonographic scans, computed tomographic scans, and magnetic resonance images. Nevertheless, the histologic type cannot be predicted except at some stages of hydatid disease in which pathognomonic features are present. The most typical imaging features of hemangioma are phleboliths and enhancement of peripheral vascular lakes. Ganglioneuroma has nonspecific radiologic features, but this diagnosis should be considered in cases with early enhancement of fine septa and progressive filling. The radiologic features of angiosarcoma and primary malignant melanoma are nonspecific. A macroscopic lipid content within an adrenal mass is theoretically characteristic of myelolipoma. This diagnosis should be made with caution, especially when the lipid content is not predominant, because of the possible association with an adenoma.     

梭形细胞血管内皮瘤的临床组织病理和超微结构的观察

梭形细胞血管内皮瘤－一种新近认识的血管肿瘤。自１９８６年Ｗｅｉｓｓ和Ｅｎｚｉｎｇｅｒ首镒报导以来，１９９８年Ｓｃｏｔｔ和Ｒｏｓａｉ也曾有过报导。著者对本病例作了临床，组织病理和超微结构的观察，旨在揭示其形态学特征，探讨其发病机理。     

Computed tomography and magnetic resonance imaging findings of primary bladder angiosarcoma: a case report

Primary bladder angiosarcomas are extremely rare but aggressive tumors. Due to the small number of cases (less than 30) reported to date, the information about natural tumor progression, optimal treatment procedure and prognosis are limited. Also, published reports of bladder angiosarcoma have not adequately featured imaging findings. Herein we report computed tomography and magnetic resonance imaging findings of a 20-year-old male with primary angiosarcoma of the bladder.     

Radiology-pathology conference: sclerosing hemangioma of the lung

Sclerosing hemangioma (SH) is a relatively rare, benign neoplasm of the lung. Although there are relatively characteristic imaging findings, biopsy remains the definitive diagnostic test. We report the radiology and pathology of a patient with a SH, with emphasis on the computed tomographic and ¹⁸F-fluorodeoxyglucose positron emission tomography findings, and review the literature on this unusual tumor.