Angiosarcoma of the breast
Primary angiosarcoma of the breast is an unusual neoplasm generally associated with a dismal prognosis. In order to determine if there is a relationship between the histological characteristics of angiosarcoma and the clinical behavior, we studied 15 such cases obtained from the Connecticut Tumor Registry between the years 1954 and 1980. Histologically the cases were classified in three types: well differentiated, moderately differentiated, and poorly differentiated. The results show that the histologic patterns of the tumors correlated closely with the prognosis. Four of the five patients with well-differentiated lesions have remained free of disease for as long as 24 years. Three of four patients with moderately differentiated lesions and three of the six patients with poorly differentiated tumors died of disease in intervals up to 4 years. We believe that careful histologic evaluation of these tumors may be of significance in the prognosis of the patients. 
Cutaneous epithelioid angiosarcoma
Three cases of cutaneous epithelioid angiosarcoma with solid pattern were studied by immunohistochemistry and electron microscopy. The neoplasms followed a slow, protracted course with local recurrences and regional lymph node metastases. The correct histological diagnosis was delayed by the close histological simulation of carcinomas, misleading ultrastructural findings, and largely negative immunohistochemical markers. Two of the patients have been followed for at least 48 months and are still alive. Some seemingly undifferentiated epithelioid angiosarcomas may entail a better prognosis than originally suspected. 
Epithelioid angiosarcoma of deep soft tissue: a distinctive tumor readily mistaken for an epithelial neoplasm
We report eight cases of epithelioid angiosarcoma arising in deep, usually intramuscular soft tissue. All the patients were men (mean age, 58). All the lesions arose in a limb or limb girdle. Cardinal morphologic features were the diffuse, sheetlike growth pattern, with only focally apparent vascular differentiation, and epithelioid tumor cells with a degree of intracytoplasmic vacuolation/lumen formation. Immunohistochemically, all eight cases coexpressed keratin as well as endothelial markers. In three cases, endothelial differentiation was confirmed ultrastructurally. Clinically, deep-seated epithelioid angiosarcomas are high-grade neoplasms that rapidly develop metastases. These findings expand the range of recognized epithelioid endothelial tumors and provide further evidence of keratin expression by such lesions. The presence of intracytoplasmic lumina/vacuoles (sometimes containing red blood cells) combined with the characteristic reticulin pattern and striking positivity for Factor VIII-RAg provide the clearest means of distinction from an epithelial metastasis. 
Angiosarcoma of Large Intestine: A Case Report
Angiosarcomas are collectively one of the rare forms of soft tissue neoplasms. That of the large intestine is much rarer. We report a case of large intestinal angiosarcoma. This is a case of a 30-year-old man who presented with intestinal obstruction, and after resection, it was histologically diagnosed as Angiosarcoma of large bowel. 
Cardiac Angiosarcoma of the Right Atrium with Cardiac Tamponade
Aims: We report a case of cardiac sarcoma, which showed cardiac tamponade as the first clinical symptom and sign. Accumulation of such cases could lead to better treatment for patients with cardiac angiosarcoma.
Presentation of Case: A 56-year-old man presented with loss of consciousness. An echocardiogram showed cardiac tamponade, requiring an emergent exploration of the pericardium. We confirmed that the tumor originated in the right atrium and advanced to the right ventricle beyond the right coronary artery. A thickened right atrium with a small hole was resected, followed by reconstruction of the right atrium using a large patch of autologous pericardium. Cardiac angiosarcoma was pathologically identified. The patient died of multiple lung metastases 6 months after the operation, despite subsequent radiation therapy.
Discussion and Conclusion: Cardiac angiosarcoma shows extremely aggressive growth, as observed in our case. More clinical reports with cardiac angiosarcoma could aid in improving diagnostic and treatment modalities. 
 Merino, M.J., Carter, D. and Berman, M., 1983. Angiosarcoma of the breast. The American journal of surgical pathology, 7(1), pp.53-60.
 Marrogi, A.J., Hunt, S.J. and Cruz, D.J., 1990. Cutaneous epithelioid angiosarcoma. The American journal of dermatopathology, 12(4), pp.350-356.
 Fletcher, C.D., Beham, A., Bekir, S., Clarke, A.M. and Marley, N.J., 1991. Epithelioid angiosarcoma of deep soft tissue: a distinctive tumor readily mistaken for an epithelial neoplasm. The American journal of surgical pathology, 15(10), pp.915-924.
 M. Sahabi, S., Abubakar, N., Abdullahi, K., Mohammed, U., T. Olayinka, L., O. Ekochin, K. and M. Bashir, B. (2017) “Angiosarcoma of Large Intestine: A Case Report”, Cardiology and Angiology: An International Journal, 6(1), pp. 1-4. doi: 10.9734/CA/2017/31373.
 Sato, H., Aizawa, K., Muraoka, A., Akutsu, H. and Misawa, Y. (2015) “Cardiac Angiosarcoma of the Right Atrium with Cardiac Tamponade”, Journal of Advances in Medicine and Medical Research, 12(5), pp. 1-5. doi: 10.9734/BJMMR/2016/22051.