Lymphoma Diagnosis and Histological Investigation

This critical topic focuses on the definitive diagnostic procedures for lymphomas, a core competency for Zambian tertiary students in histopathology and haematology. It emphasises that fine-needle aspiration is insufficient for lymphoma diagnosis, mandating a tissue biopsy—either an excised lymph node or a trucut biopsy of involved tissue. The topic details the comprehensive histological examination required, which integrates morphological assessment of the abnormal lymphoid population with essential ancillary techniques. These include immunophenotyping (using markers like CD20, CD3, CD30, CD15) to determine cell lineage and clonality, and genetic analysis (e.g., for translocations like t(14;18) or t(8;14)) to confirm diagnosis and subtype. The role of bone marrow trephine biopsy in staging is also covered. For university and college learners, mastering this systematic diagnostic algorithm is non-negotiable. It ensures accurate classification of Hodgkin and Non-Hodgkin Lymphomas, which directly dictates treatment protocols. Proficiency in this area is vital for passing professional examinations in cellular pathology and haematology, and for ensuring high-quality, reliable cancer diagnostics in Zambia's healthcare laboratories.