Abstract"Double hit" lymphomas (DHLs) are now included as a distinct entity in the 2016 revised World Health Classification of lymphoid neoplasms under the rubric "High-grade B-cell lymphoma (HGBCL), with MYC and BCL2 and/or BCL6 translocations". While DHL/HGBCL with MYC and BCL2 translocations accounts for approximately 10% of all lymphomas with the phenotypic and immunophenotypic features of diffuse large B-cell lymphoma (DLBCL), to date, the entity is unreported in children <12 years and in patients with AIDS. In reporting a DHL/HGBCL with MYC and BCL2 translocations in a 10 year old boy, we contextualize, for the first time, its occurrence and clinicopathological profile in the context of pediatric HIV infection and AIDS. In so doing, the defining features of DHL/ HGBCL with MYC and BCL2 translocations in the updated 2016 WHO classification are discussed. In addition, the clinicopathological features and therapeutic approaches in children and adults and related challenges thereof, are highlighted. Finally, the spectrum of AIDS-associated lymphomas in children and adults are tabulated and the associated diagnostic and therapeutic challenges are addressed briefly.Citation: Msimang MZ, Ramdial PK, Kuppusamy JB, Nargan K, Sheik-Gafoor MH (2017) anterior colonic resection with colo-anal anastomosis and covering ileostomy was successfully undertaken, but the patient developed sepsis and required a relaparotomy for resection of necrotic colonic tissue. On recovery he received radiotherapy and further chemotherapy, but responded poorly and demised from multi-organ failure. Pathological featuresGross features: The lower anterior resection specimen measured 38 × 8 cm ( Figure 1A) and contained a 14 × 9 × 7 cm exophytic, creamwhite, fleshy tumor ( Figure 1B) with hemorrhagic foci, 12 cm and 3 cm from the proximal and distal excision margins, respectively. The proximal and circumferential resection margins were tumor-free. The microscopic findings confirmed an ulcerative, invasive malignancy with transmural involvement and a diffusely infiltrative pattern ( Figure 1C). The pleomorphic tumor cells were large with scant eosinophilic cytoplasm, indistinct cell borders and large, vesicular nuclei with distinctive nuclear membranes and prominent nucleoli ( Figure 1D). Brisk mitotic activity was evident. Immunohistochemically, there was bright and diffuse CD45 (Figure 2A), CD20 ( Figure 2B), BCL2 ( Figure 2C), BCL6 ( Figure 2D) and CD10 ( Figure 2E) immunopositivity. In addition, there was patchy MUM-1 ( Figure 3A) and approximately 60%, variable nuclear and cytoplasmic C-MYC immunopositivity ( Figure 3B) and a Ki-67 proliferation index of >90% ( Figure 3C). T-lymphocyte and terminal deoxynucleotidyl transferase immunomarkers were negative. Epstein Barr virus (EBV)-encoded small RNA (EBER) positivity ( Figure 3D) was confirmed on chromogen in-situ hybridization investigation.

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Objective: Vulval tuberculosis (TB) is reported rarely. The histomorphological spectrum and diagnostic mimicry thereof in patients with concomitant HIV infection/ AIDS is unreported to date. This study aimed to appraise the histopathologic spectrum of vulval TB in HIV co-infected patients and to identify histopathological diagnostic challenges, mimicry and pitfalls.Methods: Ten year retrospective study that reappraised the histomorphological features of vulval TB in HIV-infected patients. Results:The clinical descriptions of the biopsied lesions from 19 patients that form the study cohort encompassed nodules (9), ulcers (5), hypertrophy/edema (3) and abscesses (2). The main microscopic features included necrotizing and non-necrotizing granulomatous inflammation, ulceration with a zoned inflammatory response and chronic suppurative inflammation. The necrotizing component had the typical morphology of caseative necrosis or of suppuration/karyorrhexis or an admixture of both necrosis types. Vasculitis, of varied histomorphology, was present in 15 biopsies. Infective special stains were pivotal diagnostic tools. The presence of mycobacteria on Ziehl Neelsen stains (ZNs) and absence of nonmycobacterial infective agents on additional infective stains, underpinned TB diagnosis, especially in biopsies that lacked prototypical granulomatous inflammation or of infective mimickers that manifest with a granulomatous phenotype. ZNs also confirmed mycobacteria in vasculitic foci. The absence of mycobacteria on ZNs facilitated the diagnosis of tuberculids. Conclusion:Lesions with a common clinical appearance had heterogeneous histomorphological features, while lesions with common histopathological features demonstrated divergent clinical morphology. Infective, especially Ziehl Neelsen, stains are pivotal in the histopathological work-up of infective/inflammatory vulval biopsies. It is possible that the rarely reported anergic mononuclear or abscessing features, pseudotumoral spindle cell reactions, ulcers with a zoned inflammatory response and the presence of vasculitis of varied type, are clues to the HIV-TB tissue partnership. Increased clinicopathological investigation of and reporting on vulval TB in the HIV/AIDS afflicted population is pivotal to ascertain this.