RESUMO
In tissue engineering, the decellularization of organs and tissues as a biological scaffold plays a critical role in the repair of neurodegenerative diseases. Various protocols for cell removal can distinguish the effects of treatment ability, tissue structure, and extracellular matrix (ECM) ability. Despite considerable progress in nerve regeneration and functional recovery, the slow regeneration and recovery potential of the central nervous system (CNS) remains a challenge. The success of neural tissue engineering is primarily influenced by composition, microstructure, and mechanical properties. The primary objective of restorative techniques is to guide existing axons properly toward the distal end of the damaged nerve and the target organs. However, due to the limitations of nerve autografts, researchers are seeking alternative methods with high therapeutic efficiency and without the limitations of autograft transplantation. Decellularization scaffolds, due to their lack of immunogenicity and the preservation of essential factors in the ECM and high angiogenic ability, provide a suitable three-dimensional (3D) substrate for the adhesion and growth of axons being repaired toward the target organs. This study focuses on mentioning the types of scaffolds used in nerve regeneration, and the methods of tissue decellularization, and specifically explores the use of decellularized nerve tissues (DNT) for nerve transplantation.
RESUMO
BACKGROUND: Angiosarcoma is a malignant rare tumor that originates from vascular endothelial cells that cover lymphatic or blood vessels. Cardiac angiosarcoma is the most prevalent sarcoma entail the heart. It has low incidence rate and poor prognosis. Our effort through this report was raising awareness of uncommon manifestations of this disease and showing the importance of appropriate diagnosis and treatment. CASE PRESENTATION: We present a case of cardiac angiosarcoma in a young female whose symptoms included dyspnea and hemoptysis with a history of pericardial effusion and a past history of cardiac surgery for suspected atrial Myxoma. She had history of several hospitalizations and relapse of symptoms a few months after each hospital discharge. CONCLUSIONS: The unspecific symptoms of cardiac angiosarcoma made it difficult to make in time diagnose and appropriate treatment. Awareness of unspecific presentations of cardiac angiosarcoma is necessary for proper diagnosis and treatment while delayed diagnosis may worsen the prognosis and even lead to death.
