Imaging modality and technique: Light microscopy of hematoxylin and eosin stained renal tissue section. The specimen reveals a densely cellular infiltrate composed of medium-sized lymphoid cells with round to oval nuclei, finely clumped chromatin, and multiple nucleoli. The tumor cells are arranged in diffuse sheets with high mitotic activity and numerous apoptotic figures. Interspersed histiocytes actively phagocytose apoptotic debris, producing scattered tingible-body macrophages that contribute to a characteristic 'starry-sky' pattern. In addition to uniform cytology, occasional mitotic figures are evident, underscoring the tumor’s aggressive biology. The background kidney parenchyma shows limited residual tubular architecture, with infiltration disrupting normal architecture. Immunophenotypic context (if tested) would typically show B-cell markers with a very high proliferation index; c-MYC rearrangement is a common molecular feature of Burkitt lymphoma. The lesion is localized within the renal parenchyma, a recognized, though less common, site of extranodal Burkitt lymphoma. Clinically, this histology corresponds to an aggressive B‑cell lymphoma requiring prompt oncologic management; differential considerations include other high-grade B-cell lymphomas (DLBCL), Burkitt-like lymphoma, and lymphoblastic lymphoma. The image is valuable for educational purposes, illustrating classic cytologic features, proliferative activity, and the hallmark starry-sky pattern in a renal presentation. This histology supports rapid diagnosis and urgent multidisciplinary treatment planning.

Comprehensive description of Burkitt lymphoma histology. This is a bright-field light microscopy image of an H&E stained lymph node biopsy. The tissue demonstrates the hallmark 'starry sky' pattern produced by numerous pale tingible-body macrophages interspersed among a dense population of medium-sized lymphoid cells. The malignant cells are small to medium with round nuclei, coarse chromatin, multiple small nucleoli, and scant cytoplasm, creating a high nuclear-to-cytoplasmic ratio. Mitotic activity is brisk, contributing to marked cellular turnover. The macrophages ingest apoptotic debris, appearing as clear spaces that resemble stars against a deep blue background of neoplastic lymphocytes. The overall architecture is diffuse, with little stromal preservation, consistent with a high-grade B-cell lymphoma. Immunophenotype is typically CD20+, CD10+, and BCL6+, with a near-100% Ki-67 proliferation index; genetic hallmark is c-MYC translocation, most commonly t(8;14)(q24;q32). Clinically, this pattern is characteristic of Burkitt lymphoma (aggressive non-Hodgkin lymphoma) and guides rapid, intensive chemotherapy. The image supports differential considerations including diffuse large B-cell lymphoma and lymphoblastic lymphoma; however, the starry-sky morphology remains highly specific in context. This description is relevant for medical education, pathology teaching, and research datasets to illustrate classic Burkitt histology, high-grade lymphoid neoplasia, and the diagnostic utility of abundant tingible-body macrophages.

Bright-field light microscopy of a renal biopsy stained with Hematoxylin and Eosin demonstrates infiltration of the renal parenchyma by a uniform population of medium-sized lymphoid cells with high nuclear-to-cytoplasmic ratio, round nuclei, finely dispersed chromatin, and prominent nucleoli. The neoplastic cells arrange in diffuse sheets, with scattered macrophages containing apoptotic debris that create a conspicuous starry-sky pattern. Mitotic activity is brisk, reflecting the high proliferative index typical of Burkitt lymphoma. The background renal architecture is variably preserved but overall shows tumor effacement of the cortex with scant residual tubules. The hallmark starry-sky appearance arises from numerous tingible-body macrophages amid the dense cellularity. Immunophenotype favors mature B-cell lineage: CD19/CD20 positive, CD10 and BCL6 positive; Ki-67 nearly 100% underscores extreme proliferative rate. Cytogenetics commonly reveal MYC rearrangement, most often t(8;14)(q24;q32). Clinically, this histology indicates an aggressive, highly chemosensitive non-Hodgkin lymphoma with potential primary renal involvement or secondary infiltration. Differential diagnoses include diffuse large B-cell lymphoma and other high-grade lymphomas, but the extreme proliferative index and starry-sky pattern support Burkitt lymphoma. Management requires prompt systemic therapy, staging, CNS assessment, and molecular testing for MYC rearrangement. This image serves as an educational resource for hematopathology, surgical pathology, and correlates with radiologic assessment.