Angioimmunoblastic T-cell lymphoma: Current Diagnostic Insights and Advances.

Angioimmunoblastic T-cell lymphoma (AITL), or nodal T-follicular helper cell lymphoma, angioimmunoblastic type, is a rare and aggressive type of T-cell lymphoma characterized by a spectrum of clinical and histopathological features that can present diagnostic challenges. Derived from T-follicular helper cells, the genesis of AITL is thought to be a multistep process involving mutations in epigenetic regulatory genes such as TET2 and DNMT3A, followed by driver mutations in RHOA and IDH2 which promote clonal expansion as well as a characteristic inflammatory milieu. This review aims to provide a comprehensive overview of AITL, including its clinical presentation, epidemiology, pathogenesis, histomorphology and treatment options. Despite advancements in the understanding of AITL biology and the development of novel treatment strategies, the prognosis for patients with AITL remains poor.