%0 Case Reports %T Controversial Flow Cytometry Monitoring of a Relapse Case of Pediatric T Cell Acute Lymphoblastic Leukemia: A Case Report. %A Popa DC %A Şerbănică A %A Obrisca R %A Şerbănică I %A Radu L %A Jercan C %A Marcu A %A Bica A %A Asan M %A Petran M %A Dragomir M %A Jardan C %A Ţică V %A Gheorghe A %A Stoian I %A Coriu D %A Coliţă A %A Coliţă A %A Popa DC %A Şerbănică A %A Obrisca R %A Şerbănică I %A Radu L %A Jercan C %A Marcu A %A Bica A %A Asan M %A Petran M %A Dragomir M %A Jardan C %A Ţică V %A Gheorghe A %A Stoian I %A Coriu D %A Coliţă A %A Coliţă A %J Front Med (Lausanne) %V 9 %N 0 %D 2022 %M 35391882 %F 5.058 %R 10.3389/fmed.2022.858809 %X Acute lymphoblastic leukemia (ALL) is the most frequent childhood cancer, with 80-85% represented by B cell ALL and only 15% by T cell ALL. T Cell ALL (T-ALL) carries a more reserved prognosis compared to B Cell ALL (B-ALL) with regard to response to treatment, risk of relapse, and overall survival. Progress made in current monitoring protocols such as via flow cytometry immunophenotyping (FCM) and by PCR-based amplification of antigen-receptor genes led to improved management of patients with ALL and superior rates of survival. Nevertheless, challenges remain in some clinical cases. This manuscript describes a unique case of T-ALL and raises awareness of such clinical challenges. The article presents an overview of the flow cytometry immunophenotyping at diagnosis and during treatment of a pediatric patient with T-ALL from Fundeni Clinical Institute. In this case, in spite of various therapeutic measures such as first-line chemotherapy for high risk group, salvage chemotherapy (FLAG), conditioning regimen (FLU-BU-TT-ATG), and stem cell transplant, a chemoresistance clone continued to be present.