Validating the Baveno Elastography Criteria of Advanced Liver Fibrosis in Two-Dimensional Shear Wave Elastography: A Prospective Pathology-Based Study.

INTRODUCTION: The Baveno criteria for assessing advanced liver fibrosis were mainly determined by transient elastography (TE), and its pathology-based validation studies in two-dimensional shear wave elastography (2D-SWE) remain limited. We aimed to validate the Baveno criteria through use of 2D-SWE. METHOD: Consecutive patients who underwent liver biopsies for various benign liver diseases were prospectively recruited. Liver stiffness measurement (LSM) was simultaneously evaluated by TE and 2D-SWE. The optimal cutoff value to predict advanced liver fibrosis was determined by the Youden Index, and the diagnostic performance was estimated using area under the receiver operating characteristic (AUROC) analysis. RESULTS: A total of 101 patients were enrolled having a median age of 55.0 (IQR: 46.0-63.5) years, with 53 (52.48%) of them being male. Using <9 and >14 kPa as the optimal dual cutoffs, the AUROC values in TE and 2D-SWE were 0.92 (95% CI: 0.83-0.97) and 0.93 (95% CI: 0.84-0.98), respectively (p = 0.61). The sensitivity and specificity of LSM by TE/2D-SWE achieved rates of 94.44%/94.44% and 86.00%/88.00%, respectively. However, using the Baveno criteria, the AUROC values in TE and 2D-SWE could remain achieving 0.91 (95% CI: 0.82-0.97) and 0.93 (95% CI: 0.84-0.98), respectively (p = 0.36). The sensitivity and specificity in TE/2D-SWE were 88.24%/88.24% and 86.79%/90.57%, respectively. CONCLUSION: This study establishes the compatibility of the Baveno dual cutoff criteria with 2D-SWE, positioning it as an easily used criteria in clinical practice and research.

Primary cutaneous gamma/delta T-cell lymphoma in Taiwan: A series of six cases with frequent solitary presentation and relatively indolent behavior.

BACKGROUND: Primary cutaneous gamma/delta T-cell lymphoma (PCDG-TCL) is aggressive, frequently presenting as multiple plaques, tumors, and/or subcutaneous nodules. METHODS: In this study, we conducted a retrospective study in a tertiary center in Taiwan to characterize this rare tumor. RESULTS: We identified six patients. Five presented with a solitary lesion, including two with clinical impression of epidermal inclusion cyst or lipoma. Two of four evaluable cases exhibited epidermotropism, with one mimicking Pautrier microabscess. The neoplastic cells were pleomorphic and mostly medium- to large-sized. In all cases, the neoplastic cells expressed T-cell receptor (TCR)-γ and/or TCR-δ, with four co-expressing ßF1. Two of these ßF1+ cases co-expressed TCR-γ but not TCR-δ (two different clones). All were negative for Epstein-Barr virus (EBV), low stage, and treated with radiotherapy alone or combined chemotherapy and radiotherapy. In two patients, lymphoma relapsed in 3 and 7 months, respectively, and one patient died of the disease in 7 months. Four other patients were free of disease for 6 to 126 months. CONCLUSION: PCGD-TCL cases in Taiwan are more commonly solitary, frequently with indolent courses. The two currently available TCR-δ clones alone might be insufficient to detect all tumors.

Investigating early progression of Hodgkin lymphoma in a two-center analysis.

BACKGROUND/PURPOSE: The early progression of disease (POD) of Hodgkin lymphoma (HL) leads to a poor prognosis. To identify risk factors for early POD, this retrospective two-center cohort analysis was conducted. METHODS: Medical records of HL patients between 1998 and 2020 from two referral centers were reviewed. RESULTS: Two-hundred and sixty-nine patients were analyzed. The distribution of early vs. advanced stages was 51.1 vs. 48.9%, respectively. The 5-year progression free survival (PFS) was 63%, and the overall survival (OS) was 87% with a median follow-up of 52.0 months. The complete remission (CR) rate was 85.7%. Disease progression or relapsed disease occurred in 33.9% (n = 85) of patients while 17.0% of this cohort had early POD within 12 months of induction therapy. Patients with early POD had a worse median OS than those without (p < 0.001). Failure to achieve post-induction CR and high international prognostic score (IPS, 3-7) were independent risk factors for early POD. Compared with chemotherapy alone, consolidative radiotherapy after induction chemotherapy was associated with a lower risk of early POD (21.3% vs. 6.2%, p = 0.006). CONCLUSION: High IPS was an independent risk factor for early POD, which was less observed in those with consolidative radiotherapy.

Clinicopathologic Features of Lymphoproliferative Neoplasms Involving the Liver.

Background and Objectives: Primary hepatic lymphoproliferative neoplasms (PHL) are uncommon. This retrospective study is aimed to present the clinicopathological characteristics of PHL and compare to secondary hepatic lymphoproliferative neoplasms (SHL). Materials and Methods: Patients who were diagnosed with lymphoproliferative neoplasms involving the liver between January 2004 and December 2018 at a tertiary medical center in central Taiwan were included. The demographic and clinical data, radiological results and histopathological findings were reviewed and summarized. Results: We analyzed 36 patients comprising 6 PHL patients and 30 SHL patients. The median age at diagnosis tended to be younger in PHL than in SHL (59 vs. 63 years old, p = 0.349). Both entities had a small male predominance. The PHL patients tended to have higher levels of aspartate aminotransferase, alanine transaminase and serum albumin and lower levels of alkaline phosphatase, total bilirubin, γ-glutamyl transferase and lactate dehydrogenase compared with SHL, but there was no significant difference. Multiple mass lesions were the most common radiological finding in both groups. Diffuse large B-cell lymphoma was the predominant subtype in both groups (67% in PHL and 40% in SHL). The PHL patients had a longer median survival than the SHL patients (not reached vs. 3 months, p = 0.003). Conclusions: Although there was no significant difference between PHL and SHL in clinical, laboratory and radiological features, the SHL patients had very poor outcomes with a median survival time of 3 months. Effective therapies are urgently required for these patients.

MYD88 L265P mutation analysis is a useful diagnostic adjunct for lymphoplasmacytic lymphoma with pleural effusion.

Lymphoplasmacytic lymphoma (LPL) is a marrow-based lymphoma, rarely involving extramedullary sites, particularly the pleural cavities. The distinction of lymphomatous pleural effusion (PE) in LPL patients from benign effusion is challenging. We conducted this study to examine whether MYD88 L265P mutation analysis is useful in distinguishing benign from lymphomatous PE in four patients with LPL, in which the initial marrow specimens were all positive for MYD88 mutation. In one case each with plasma cell- or lymphocyte-predominant PE, MYD88 mutation was positive, confirming lymphomatous effusion. The other lymphocyte-predominant PE was negative for MYD88 mutation, but was clonally related to a previous nodal biopsy and this PE was also considered to have LPL involvement. The fourth case developed large B-cell lymphoma in the PE 30 months later. The PE specimen was negative for MYD88 mutation but was clonally related to the diagnostic marrow tissue, indicating large cell transformation. Four cases of small lymphocyte-predominant benign PE from patients without history of lymphoma were examined and were all negative for MYD88 L265P mutation. In conclusion, in this small case series we showed that MYD88 L265P mutation analysis could serve as a useful adjunct in distinguishing benign from lymphomatous PE in patients with LPL.

The Incidence of Gastric Adenocarcinoma Among Patients With Gastric Intestinal Metaplasia: A Long-term Cohort Study.

BACKGROUND AND AIMS: Gastric intestinal metaplasia (IM) has been known as a premalignant condition, but estimates of its cancer risk vary widely. We aimed to analyze cancer risk of gastric IM by a long-term cohort study. METHODS: We conducted a hospital-based study that included all patients with gastric IM between 1992 and 2010, and the development of gastric adenocarcinoma was evaluated until July 2011. Patients developing gastric cancer ≤180 days after the index diagnosis of IM were excluded. The incidence rate, the cumulative incidence, and the standardized incidence ratio (SIR) of gastric cancer were determined, and hazard ratios (HRs) of risk factors were calculated. RESULTS: We identified 7059 patients with a median follow-up duration of 5.1 years, and 81 patients developed gastric adenocarcinoma during the study period. The 5-, 10-, and 15-year cumulative incidences of gastric cancer were 0.9% [95% confidence interval (CI), 0.6-1.1), 2.0% (95% CI, 1.5-2.6), and 3.0% (95% CI, 2.0-4.0), respectively. On multivariate analysis, older age (eg, 75 y and above; HR=7.4; 95% CI, 2.8-19.6), low-grade dysplasia (HR=4.0; 95% CI, 2.1-7.9), and high-grade dysplasia (HR=18.8; 95% CI, 9.0-39.5) were independent risk factors. As compared with the risk in the general population, the SIR of gastric cancer among patients with gastric IM was 2.5 (95% CI, 2.0-3.1). However, the SIR was only 2.0 (95% CI, 1.5-2.6) in the nondysplasia subgroup, but was up to 35.2 (95% CI, 15.2-69.4) in the high-grade dysplasia subgroup. CONCLUSIONS: Gastric IM is an important risk factor for gastric cancer, but surveillance should be arranged only for those at an especially high risk.

Clinicopathological and genetic landscape of plasmablastic lymphoma in Taiwan.

Plasmablastic lymphoma (PBL) is an aggressive large B-cell lymphoma with a terminal B-cell differentiation phenotype and is frequently associated with immunodeficiency. We aimed to investigate the clinicopathological and immunophenotypic features, genetic alterations, and mutational landscape of PBL in Taiwan. We retrospectively recruited 26 cases. Five (5/18; 28%) patients were HIV-positive and 21 (81%) presented extranodally. There were two morphological groups: one with purely monomorphic large cells (85%) and the other comprising large cells admixed with plasmacytic cells (15%). Phenotypically, the tumors expressed MYC (8/10; 80%), CD138 (20/26; 77%), and MUM1 (20/20; 100%), but not CD20 (n = 26; 0%). Fourteen (54%) cases were positive for EBV by in situ hybridization; the EBV-positive cases were more frequently HIV infected (p = 0.036), with extranodal presentation (p = 0.012) and CD79a expression (p = 0.012), but less frequent light chain restriction (p = 0.029). Using fluorescence in situ hybridization, we identified 13q14 deletion, MYC rearrangement, and CCND1 rearrangement in 74%, 30%, and 5% cases, respectively, without any cases having rearranged BCL6 or IGH::FGFR3 fusion. In the 15 cases with adequate tissue for whole exome sequencing, the most frequent recurrent mutations were STAT3 (40%), NRAS (27%), and KRAS (20%). In conclusion, most PBL cases in Taiwan were HIV-unrelated. Around half of the cases were positive for EBV, with distinct clinicopathological features. Deletion of chromosome 13q14 was frequent. The PBL cases in Taiwan showed recurrent mutations involving JAK-STAT, RAS-MAPK, epigenetic regulation, and NOTCH signaling pathways, findings similar to that from the West.

Lymphoma-associated hemophagocytic lymphohistiocytosis: experience in adults from a single institution.

Lymphoma-associated hemophagocytic lymphohistiocytosis (HLH) is a rare but fatal disease. Differences between B cell and T cell lymphoma-associated HLH remain unclear, specifically clinical characteristics and survival. We retrospectively analyzed 30 lymphoma-associated HLH patients from July 2004 to October 2012. Patients were divided into B cell (n = 13) and T cell (n = 17) lymphoma groups. Patients' age, performance status, presence of Epstein-Barr virus infection, international prognostic index, presence of disseminated intravascular coagulopathy, serum triglyceride, fibrinogen, and lactate dehydrogenase levels were not significantly different between B cell and T cell lymphoma groups. HLH was an indicator for treatment resistance in patients with B cell (p = 0.048), but not T cell (p = 0.217), lymphoma. Patients in the T cell lymphoma group, however, had higher serum ferritin levels than patients in the B cell lymphoma group (11,525.6 versus 3,790.6 ng/mL; p = 0.043). The median survival time for patients in the B cell and T cell lymphoma groups was 330 and 96 days, respectively. Although the difference was not statistically significant (p = 0.273), our results suggested a trend toward a better overall survival time in patients with B cell lymphoma. This survival advantage could be at least partially due to use of rituximab (p = 0.045) for the treatment of patients with B cell lymphoma. Our results also suggested that allogeneic hematopoietic stem cell transplantation could possibly provide survival benefits to T cell lymphoma-associated HLH by graft-versus-lymphoma effect.

Surgical decompression improves recovery from neurological deficit and may provide a survival benefit in patients with diffuse large B-cell lymphoma-associated spinal cord compression: a case-series study.

BACKGROUND: Malignancy-associated spinal cord compression is generally treated by surgical decompression, radiotherapy or a combination of both. Since diffuse large B-cell lymphoma (DLBCL) is highly sensitive to both chemotherapy and radiotherapy, the role of surgical decompression in the treatment of DLBCL-associated spinal cord compression remains unclear. We therefore conducted a retrospective review to investigate the impact of surgical decompression on recovery from neurological deficit caused by DLBCL-associated spinal cord compression and patients' overall survival. METHODS: Between March 2001 and September 2011, 497 newly diagnosed DLBCL patients were reviewed, and 11 cases had DLBCL-associated spinal cord compression. Six cases were treated surgically and five cases nonsurgically. RESULTS: The rates of complete recovery from neurological deficit were 100% (6/6) and 20% (1/5) for patients in the surgical and nonsurgical groups, respectively (P = 0.015), while the median survival for patients in the surgical and nonsurgical groups was 48.6 months and 17.8 months, respectively (P = 0.177). CONCLUSIONS: We conclude that surgical decompression can improve recovery from neurological deficit in patients with DLBCL-associated spinal cord compression, possibly providing these patients a survival benefit.

Rosai-Dorfman disease mimicking craniopharyngioma: a challenging differential diagnosis. Illustrative case.

BACKGROUND: Rosai-Dorfman disease (RDD) is a rare non-Langerhans histiocytic disorder with less than 5% central nervous system involvement and is often mistaken for meningioma given the similarity in imaging features. The authors present the unique case of a 44-year-old female who presented with ongoing visual impairment. OBSERVATIONS: A purely suprasellar mass was noted on magnetic resonance imaging and was initially diagnosed as craniopharyngioma. Unexpectedly, the pathology report revealed RDD. LESSONS: To date, only six cases of sellar RDD have been reported, and our case is the first reported with a purely suprasellar presentation. No standard treatment has been established for RDD, and next-generation sequencing may be a promising therapeutic option.

Lymph Nodes With Increased IgG4-positive Plasma Cells and Patterns Suspicious for IgG4-related Disease: Can Lymph Nodes Be the Only Site of Disease?

Lymphadenopathy with increased immunoglobulin (Ig) G4 + plasma cells can be a nonspecific finding or a manifestation of immunoglobulin G4-related disease (IgG4-RD). It remains unclear whether there are characteristic pathologic features of IgG4-RD involving lymph nodes, or if IgG4-RD lymphadenopathy can occur without other manifestations of IgG4-RD. In this study, we assessed 55 lymph node biopsy specimens (44 men and 11 women with a mean age of 55 y) with increased IgG4 + plasma cells that had 1 of the 6 well-described pathologic patterns. We also correlated these findings with IgG4 serum levels and followed these patients for 7 to 108 months (mean, 34.9 mo) for the occurrence of extranodal IgG4-RD. We further compared lymphadenopathy in patients who developed other manifestations of IgG4-RD (RD + , n=20, 36%) versus those who did not (RD - , n=35, 64%). We found that there were only minor significant differences between 2 groups, including frequency of receiving treatment (RD + , 90% vs. RD - , 60%, P =0.021) and higher serum levels of C-reactive protein (>8 mg/L, RD + , 53% vs. RD - , 13%, P =0.007). Other differences were either borderline or not significant, including mean age (RD + , 59.8 y vs. RD - , 51.9 y, P =0.097), male-to-female ratio (RD + , 16:4 vs. RD - , 28:7, P =1), constitutional symptoms (RD + , 25% vs. RD - , 9%, P =0.096), multiple enlarged lymph nodes (RD + , 45% vs. RD - , 26%, P =0.143), good response to therapy (RD + , 94% vs. RD - , 94%, P =1); higher serum IgG4 levels (>280 mg/dL, RD + , 75% vs. RD - , 51%, P =0.086), anemia (RD + , 45% vs. RD - , 43%, P =0.877), leukopenia (RD + , 0% vs. RD - , 3%, P =0.446), thrombocytopenia (RD + , 10% vs. RD - , 6%, P =0.556), positivity for antinuclear antibody (RD + , 24% vs. RD - , 29%, P =0.688), elevated serum levels of lactate dehydrogenase (>225 U/L, RD + , 0% vs. RD - , 20%, P =0.064), elevated serum IgE level (>100 IU/mL, RD + , 75% vs. RD - , 92%, P =0.238), and hypergammaglobulinemia (RD + , 90% vs. RD - , 86%, P =0.754). There were also no differences in morphologic patterns ( P =0.466), IgG4 + cell location ( P =0.104), eosinophil counts (RD + , 10.3±11.3 vs. RD - , 13.4±17.5, P =0.496), Epstein-Barr virus positivity (RD + , 35% vs. RD - , 60%, P =0.074), and Epstein-Barr virus-positive cell location ( P =0.351). Our findings suggest that there are minimal differences between stringently defined IgG4-RD lymphadenopathy with versus without other manifestations of IgG4-RD. These findings also suggest the existence of IgG4-RD lymphadenopathy as the sole presentation of IgG4-RD.

Splenic irradiation-induced gastric variceal bleeding in a primary splenic diffuse large B-cell lymphoma patient: a rare complication successfully treated by splenectomy with short gastric vein ligation.

Primary splenic diffuse large B-cell lymphoma (DLBCL) is a rare clinical condition, which is generally treated by six to eight cycles of chemotherapy involving a combination of rituximab and the cyclophosphamide, adriamycin, vincristine, and prednisolone (CHOP) regimen. However, the treatment for chemorefractory primary splenic DLBCL remains controversial. Therapeutic splenic irradiation (SI) might be a reasonable and possibly the only treatment option with curative intention for patients with chemorefractory primary splenic DLBCL. However, the efficacy and safety of therapeutic SI are unclear. Herein, we present the case of a primary splenic DLBCL patient who was refractory to multiple chemotherapy regimens but achieved complete remission after administration of therapeutic SI. However, his condition was complicated with severe gastric variceal bleeding due to splenic venous thrombosis, which was successfully treated via splenectomy and short gastric vein ligation. On the basis of our findings, we concluded that the splenic venous thrombosis-induced gastric variceal bleeding was a rare but life-threatening adverse effect of the therapeutic SI administered for primary splenic DLBCL. Surgical intervention involving splenectomy and short gastric vein ligation is mandatory and should be performed as soon as possible for such patients.

The diagnosis of sinonasal lymphoma: a challenge for rhinologists.

The presenting symptoms of sinonasal lymphoma are usually similar to those of benign inflammatory diseases. Adequate amount of biopsy tissue is required for a definitive diagnosis because tumor coexisting with necrosis or inflammation is not uncommon. Therefore, the diagnosis of sinonasal lymphoma is a challenge for rhinologists. Thirty-two patients diagnosed as having sinonasal lymphoma from 1990 to 2010 in our hospital were included in this study. The presenting symptoms of these patients included nasal obstruction, rhinorrhea, bloody discharge/epistaxis, post nasal drip, facial swelling, neck mass, orbital symptoms, fever, and body weight loss. The average period between patients' awareness of their symptoms and their decision to seek medical help was 8.9 months. When they were referred to our hospital, the first impression of 20 patients (62.5%) was benign or malignant nasal neoplasm, and that of the other 12 patients (37.5%) was rhinitis or rhinosinusitis. These patients then received image studies and biopsy or surgical intervention. Most patients needed repeated biopsies, endoscopic sinus surgery, turbinectomy, or Caldwell-Luc operation for a definitive diagnosis. Their histopathologic classification included NK/T cell lymphoma (n = 13, 40.6%), peripheral T cell lymphoma (n = 12, 37.5%), and diffuse large B cell lymphoma (n = 7, 21.9%). Peripheral T cell lymphoma and NK/T cell lymphoma mostly occurred in the nasal cavity, whereas sinus involvement without nasal disease is common in B-cell lymphoma Our results reveal that patients with sinonasal NHL tend to ignore their symptoms until they become serious, and a definitive diagnosis usually requires repeat and deep biopsy.

Morphologic Spectrum of Lymphadenopathy in Drug Reaction With Eosinophilia and Systemic Symptoms Syndrome.

CONTEXT.­: Drug-induced hypersensitivity syndrome/drug reaction with eosinophilia and systemic symptoms (DRESS) is a drug-induced, adverse T-cell-mediated hypersensitivity reaction that most often involves skin. The pathologic findings of DRESS-related lymphadenopathy have been described infrequently in the literature. OBJECTIVE.­: To present a case series of DRESS-related lymphadenopathy with an emphasis on the morphologic spectrum. DESIGN.­: We describe detailed clinical and pathologic findings along with the literature review. We focus on the differential diagnosis between DRESS lymphadenopathy and angioimmunoblastic T-cell lymphoma (AITL). RESULTS.­: There were 4 men and 1 woman with a mean age of 41 years (range, 23-59 years). One patient (20%) died. Three lymph node biopsy specimens showed a pattern reminiscent of AITL (AITL-like pattern) and 2 cases showed necrotizing lymphadenitis (Kikuchi-like pattern), associated with vasculitis in 1 case. The AITL-like morphology of DRESS-related lymphadenopathy may be difficult to distinguish from genuine AITL. The clinical information is important for differential diagnosis, including history of drug exposure, age, and the rarity or absence of AITL-associated manifestations such as hemolytic anemia and hypergammaglobulinemia. Molecular analysis of the T-cell receptor genes is helpful, typically revealing a polyclonal pattern in DRESS-related lymphadenopathy. CONCLUSIONS.­: In the literature, 4 histologic patterns of DRESS lymphadenopathy have been described: reactive lymphoid hyperplasia, necrotizing lymphadenitis, Hodgkin lymphoma-like, and AITL-like. These patterns, particularly those that resemble lymphoma, highlight the importance of correct diagnosis to avoid unnecessary therapies.

Clinical Features and Immunophenotypes of Double-Hit Diffuse Large B-Cell Lymphoma.

Double-hit (DH) genetics induces a reduction in the complete remission (CR) and, consequently, in poor overall survival (OS) in diffuse large B-cell lymphoma (DLBCL) patients. Unfortunately, DH identification is time-consuming. Here, we retrospectively reviewed 92 newly diagnosed DLBCL patients, stratified them into the DH (n = 14) and non-DH groups (n = 78), and compared their clinical features and outcomes. The results revealed that the DH group had a higher percentage of bulky disease than the non-DH group (64.3% vs. 28.2%; p = 0.013). More patients in the DH group tested positive for double expresser (DE) (50.0% vs. 21.8%; p = 0.044). The three-year OS rates of patients with and without DH were 33.3% and 52.2%, respectively (p = 0.016). Importantly, advance stage and multiple comorbidities were correlated with a high mortality rate in multivariate analysis. Furthermore, by combining DE and the bulky disease, a specificity of 89.7% for DH prediction was achieved. In summary, DH genetics, not DE immunopositivity, could be a factor for an inferior OS in DLBCL. A combination of bulky disease and a positive DE immunophenotype could facilitate DH genetics prediction in newly diagnosed DLBCL patients.

Distinctive patterns of marrow involvement by classic Hodgkin lymphoma are clues for diagnosis and subtyping.

Classic Hodgkin lymphoma (CHL) is a lymphoid neoplasm deriving from B cells in a rich inflammatory background. There are four histological subtypes with different epidemiological features. Bone marrow involvement by CHL is infrequent, and subtyping CHL from the bone marrow is not suggested as there might be discordant histopathology between the primary tumors and bone marrow specimens. In this study, we aimed to identify the histopathological features of bone marrow involved by CHL and tried to correlate these features with their subtypes. Among the 23 recruited cases, the frequencies of mixed cellularity (MC; 48%, 11/23) and nodular sclerosis (NS; 44%, 10/23) were similar. There were two patterns of marrow involvement: pattern A (fibrous), space-occupying lesions with alternating hypo- and hypercellular areas against a fibrotic background with dilated sinusoids and pattern B (histiocyte-rich), ill-defined granuloma-like lesions in which histiocytes merged with normal hematopoietic and inflammatory cells. Pattern A was more frequent in patients with CHL-NS than CHL-MC (100% vs. 18.2%; p < 0.001). Diagnostic Hodgkin cells and Reed-Sternberg (HRS) cells were identified in all cases, while HRS variant lacunar cells were occasionally discovered, particularly in the CHL-NS subtype (NS 100% vs. MC 9%; p < 0.001). The frequency of EBV association was higher in MC (64%) than that in NS (36%) subtype, but not statistically significant. Of the two patterns of marrow involvement, pattern A was more commonly associated with the NS subtype and less frequently associated with EBV. Recognizing the patterns of marrow involvement is important for diagnosis and may contribute to the subtyping of CHL.

Detection of DLBCL by pixel purity index and iterative linearly constrained minimum variance into hyperspectral imaging analysis.

It is unclear whether a hyperspectral imaging-based approach can facilitate the diagnosis of diffuse large B-cell lymphoma (DLBCL), and further investigation is required. In this study, the pixel purity index (PPI) coupled with iterative linearly constrained minimum variance (ILCMV) was used to bridge this gap. We retrospectively reviewed 22 pathological DLBCL specimens. Ten normal lymph node specimens were used as controls. PPI endmember extraction was performed to identify seed-training samples. ILCMV was then used to classify cell regions. The 3D receiver operating characteristic (ROC) showed that the spectral information divergence possessed superior ability to distinguish between normal and abnormal lymphoid cells owing to its stronger background suppression compared with the spectral angle mapper and mean square error methods. An automated cell hyperspectral image classification approach that combined the PPI and ILCMV was used to improve DLBCL diagnosis. This strategy intelligently resolved critical problems arising in unsupervised classification.

The spectrum of intestinal mature T- and NK-cell neoplasms in a tertiary center in Taiwan with a high frequency of perforation.

Primary intestinal T-cell lymphomas (PITLs) comprise enteropathy-associated T-cell lymphoma (EATL), monomorphic epitheliotropic intestinal T-cell lymphoma (MEITL), extranodal NK/T-cell lymphoma (ENKTL), anaplastic large cell lymphoma (ALCL), and intestinal T cell lymphoma, NOS (ITCL-NOS). MEITL is composed of monomorphic medium cells expressing CD8 and CD56, with a cytotoxic phenotype. We retrospectively analyzed 77 cases of intestinal T-cell lymphomas, 71 primary and six secondary, at a tertiary center in Taiwan from 2001 to 2021. Perforation occurred in 57 (74%) patients, including 56 (73%) at presentation and one after chemotherapy. The primary cases included MEITL (68%), ENKTL (14%), ITCL-NOS (13%), ALCL (4%), and EATL (1%). The perforation rate was 90%, 70%, and 22% in MEITL, ENKTL, and ITCL-NOS cases, respectively (p < 0.0001, Fisher's exact test). Most (75%; n = 36) MEITL cases were typical; while seven (15%) had atypical morphology and five (10%) exhibited atypical immunophenotype. The tumor cells of ITCL-NOS were pleomorphic, with various expression of CD8 or CD56. All METIL, ITCL-NOS and ALCL cases were negative for EBER; while all ENKTL cases, either primary or secondary, were positive for cytotoxic granules and EBER. The prognosis of PITL was poor, with a medium survival of 7.0, 3.3, and 3.7 months among patients with MEITL, ENKTL, and ITCL-NOS, respectively. Of the six secondary cases, the primary tumors orginated from nasal ENKTL (n = 5) and cutaneous PTCL-NOS (n = 1). We showed a wide spectrum of intestinal T-cell lymphomas in Taiwan, with MEITL as the most common PITL, a high rate of perforation, and a wider morphological and immunophenotypic spectrum.