{Reference Type}: Case Reports {Title}: Non-Hodgkin's Anaplastic Large T-Cell Lymphoma: A Case Report. {Author}: Halpern GA;Miziara Brochi L;Gomes C;Lachter Zusman G;Carvalho de Macedo F;Annete Damasceno Rodrigues J; {Journal}: Cureus {Volume}: 16 {Issue}: 6 {Year}: 2024 Jun 暂无{DOI}: 10.7759/cureus.63040 {Abstract}: Anaplastic large T/null cell lymphoma (ALCL) is an aggressive non-Hodgkin's lymphoma (NHL) that most commonly affects young men. Herein, we present a case of a 32-year-old male patient in severe condition with ulcerated right axillary adenopathy, diffuse subcutaneous nodules, and sepsis. He was admitted to the ED, where a bone marrow aspirate and biopsy confirmed the diagnosis of ALCL. The immunohistochemical examination demonstrated neoplastic cells with immunopositivity with antibodies CD3 (focal), CD30 (diffuse), protein ALK-1 (diffuse), and epithelial membrane antigen (EMA) (multifocal). Appropriate chemotherapy treatment was done, and the patient showed a complete response. This article aims to report a rare subtype of NHL to increase awareness and bring up a discussion about the clinical presentation and diagnostic features of ALCL. Moreover, we discuss treatment regimens that are currently used and have shown reasonable disease remission rates.