Progressive transformation of germinal centers: Bridging clinical and pathological insights for diagnostic precision

Progressive Transformation of Germinal Centers (PTGC) is a rare, benign lymphoid condition that presents considerable diagnostic challenges due to its overlapping histological and immunophenotypic features with certain lymphomas, especially nodular lymphocyte-predominant Hodgkin lymphoma and classical Hodgkin lymphoma. PTGC typically manifests as localized, nontender lymphadenopathy, and while the clinical course is usually indolent, a small subset of patients may experience progression to lymphoma. Given the potential for misclassification and overtreatment, there is a need for heightened diagnostic accuracy and clinical awareness. This review provides an updated, comprehensive synthesis of clinical features, histopathology, immunophenotyping, molecular diagnostics, and management strategies. Emphasis is placed on integrating multidisciplinary data to achieve diagnostic clarity, appropriately manage patient care, and monitor for rare cases of transformation. The review also includes recent literature on immunohistochemical and molecular patterns that improve the distinction between PTGC and malignant lymphoproliferative diseases.