CT features of inflammatory pseudotumor like follicular dendritic cell sarcoma of the spleen / 中华肝胆外科杂志

Objective:To explore the CT features of inflammatory pseudotumor like follicular dendritic cell sarcoma (FDCS) of the spleen.Methods:The clinical data of 12 patients with splenic inflammatory pseudotumor like FDCS admitted to 3 central hospitals including Yongjia People's Hospital in Zhejiang Province from January 2015 to December 2022 were retrospectively analyzed, including 4 males and 8 females, with a median age of 60 years old. The number, shape, size and CT features of the lesions were analyzed based on patient's CT image data.Results:CT scans of 12 patients showed 15 lesions, including 10 single lesions and 2 multiple lesions. The lesions were circular in 5 cases, elliptical in 4 cases, and irregular in 3 cases. The median maximum diameter of the mass is 6.5 cm. On plain scan, all 12 tumors showed low density or slightly low density. The CT value is (41.3±7.2) HU; 8 cases had uneven density and 4 cases had uniform density. There were 8 cases with clear tumor boundaries and 4 cases with unclear boundaries. There were 8 cases with tumor necrosis and cystic transformation, and 5 cases showed patchy bleeding lesions in the center of the tumor. Enhancement: the arterial phase shows small patches or flocculent enhancement at the edges or parenchymal parts of the tumor, with CT value of (56.0±3.8) HU. Among them, there were 7 cases of mild enhancement, 4 cases of moderate enhancement, and 1 case of significant enhancement. During the portal phase, there was mild to moderate persistent small patchy uneven enhancement, with CT value of (62.0±4.3) HU. Among them, there were 8 cases of mild enhancement and 4 cases of moderate enhancement. The delayed phase showed a slow withdrawal of enhancement, with CT value of (45.0±8.2) HU. All 12 cases underwent complete resection and were diagnosed with FDCS through pathological examination.Conclusion:FDCS plain scan shows circular or elliptical uneven low-density masses, with small patches or flocculent light to moderate uneven enhancement in the arterial phase, continuous enhancement in the portal phase, and slow withdrawal in the delayed phase as the main characteristics.

Histopathological and immunohistochemical clues to the illusive diagnosis of follicular dendritic cell sarcoma: A clinicopathological masquerader

Follicular dendritic cell sarcoma is a rare histiocytic and dendritic neoplasm mainly involving the lymph nodes and selective extranodal sites. They are often misdiagnosed due to nonspecific clinical, radiological, and morphological findings in addition to their rarity. Four cases described below had variable age of presentation, site of involvement, size of the lesion, and histopathological features. Application of an extensive immunohistochemical panel, including a combination of >1 dendritic cell marker, clinched the diagnosis. A combination of D2-40 and Cluster of differentiation 21 (CD21) worked best in establishing a definite role in the current series. Programmed death-ligand 1 (PD-L1) analysis was positive in two of the three cases where it could be performed. However, none of our cases had received immunotherapy. Prompt recognition of the described histopathology features and incorporation of novel immunohistochemical markers can translate to timely initiation of therapy for this aggressive disease

Comparison of primary follicular lymphoma of gastrointestinal tract and secondary involvement: A study from South India

Primary follicular lymphoma of the gut (PFL-GI) is a rare entity. This study aims to compare the clinicopathologic features of PFL-GI with cases of gastrointestinal involvement by disseminated nodal follicular lymphoma. This is a retrospective study with 6 cases of primary follicular lymphoma and 8 cases of secondary involvement of the gut, over a period of 9 years. The slides and blocks were retrieved and reviewed. Clinical data was obtained from hospital records. Clinicopathologic features were compared. PFL-GI cases had a slightly higher median age group (p value 0.23) and no gender predilection when compared to cases with secondary involvement which showed a female preponderance. Para-aortic lymphadenopathy was seen in all secondary cases whereas none of the primary cases showed significant lymphadenopathy. The only microscopic feature that was different was the presence of hollowed out pattern of immunostaining for follicular dendritic cells seen in all cases of PFL-GI but in none of the secondary cases

Clinicopathological Features of Follicular Dendritic Cell Sarcoma / 中国医学科学院学报

To explore the clinicopathological and immunohistochemical characteristics of follicular dendritic cell sarcoma(FDCS)and the expressions of IgG and IgG4. We retrospectively analyzed the clinicopathological and immunohistochemical data of 9 pathologically confirmed FDCS cases in Peking Union Medical College Hospital from January 2005 to December 2018.Immunohistochemical staining of IgG and IgG4 were performed,and Epstein-Barr virus(EBV)-encoded RNA(EBER)in situ hybridization were carried out. Nine cases of FDCS included 4 men and 5 women aged 16-53 years [mean(38.2±9.7)years].The clinical manifestations included masses,lymph node enlargement,rash,and fever.The tumors were located in lymph node,retroperitoneal region,adrenal gland,neck,axillary region,and liver,respectively.Ultrasound showed clear boundary cystic or solid mass with maximum diameters of 1.5-15.0 cm.Microscopically,the spindle tumor cells were arranged in solid and storiform patterns with abundant and slightly stained cytoplasm,vacuolated nuclei,and small nucleoli.The mitosis was 1-3/10 high power fields,and necrosis was found in 5 cases.Immunohistochemically,the tumor cells were positive for CD21(6/9),CD35(6/9),and CD23(7/9). FDCS is a rare malignant tumor,which is easy to be missed.The combination of CD21,CD35,and CD23 is helpful for diagnosis.Hyaline-vascular type Castleman's disease may be the precursor of FDCS,and there may be only a small number of IgG4-positive plasma cells in FDCS.Surgical resection remains the main treatment for FDCS.

Radiological features of follicular dendritic cell tumor of spleen / 中华放射学杂志

Objective To summarize the radiological features of follicular dendritic cell tumor of spleen (FDCS).Methods The clinical, radiological and pathological data of 8 patients from November 2011 to November 2017 in 5 hospitals with FDCS confirmed by pathology were retrospectively analyzed. All patients underwent CT examinations including plan and enhanced CT. Three patients underwent additional MRI and two patients underwent PET‐CT examinations simultaneously. The imaging features such as location, number, shape, boundary, size, internal structure, density (or signal, 18F‐fluorodeoxyglucose uptake), enhancement model and the relationship with surrounding structures were observed and compared with pathological results. Results Of the 8 patients with FDCS, 7 were located in the spleen and 1 was located in the spleen of the ectopic spleen of the pancreas. Seven patients with splenic FDCS underwent splenectomy and 1 patient with pancreatic ectopic spleen FDCS underwent resection of the pancreas. Multiple lesions were detected in 1 case, while single in the others. Tumor was round or oval. The tumors were well‐circumscribed and presented as expansive growth. On unenhanced CT, the tumors showed a slightly lower density, and hemorrhage and necrosis could be detected in 6 lesions. Calcification was seen in 1 case, significant necrosis, and cystic change was presented in the pancreatic ectopic spleen FDCS. The solid part presented isointensity or slightly hypointensity on T1WI, and hyperointensity on T2WI. Cystic necrosis areas were hypointensitive on T1WI, and hyperointensitive on T2WI. Spoke‐like areas with hypointensity on T1WI and hyperointensity on T2WI were detected in the center of the solid part with the distribution among the substantial degenerative and necrotic regions. PET‐CT showed that the 18F‐fluorodeoxyglucose was uptaked obviously. The enhancement CT showed that at the arterial phase, the tumors were markedly enhanced and continuously enhanced at portal vein phase and balance phase. Multiple liver metastases were detected in 1 case with huge FDCS. One patient was followed up for 6 years, and gastric lymphoma was detected. The others were followed up for 6 to 53 months, there remained no transfer or recurrence.Conclusions The features of FDCS of spleen mainly manifest as solid or cystic mass with clear solitary sphenoma accompanied by scarring, calcification and hemorrhage. The enhancement mode is persistent enhancement. MRI and PET‐CT help to further reflect the tumor pathological basis and biological characteristics.

Follicular Dendritic Cell Sarcoma - A Case Report

Follicular dendritic cell sarcoma is an uncommon tumor that originates from follicular dendritic cells. The identification and diagnosis of FDCS is not as easy as it has close histological resemblance with non-Hodgkin lymphoma, sarcoma, melanoma, undifferentiated carcinomas, melanoma, and other dendritic or histiocytic cell disease. The definite diagnosis of FDCS can be established with the help of immunohistochemical investigation coupled with imaging modalities such as positron-emission tomography and computed tomography. We present a case of an elderly woman with a history of follicular dendritic tumor. The patient was primarily treated with CHOP chemotherapy in a different hospital. Upon initial investigation in our institution, disease progression was observed. The patient was treated with GEMTAX chemotherapy. The patient showed a partial response to therapy after three cycles of GEMTAX. However, disease progression was observed after six cycles of GEMTAX. The patient was switched to ESHAP, wherein after three cycles partial response to therapy was observed as per PET-CT scans. Despite the use of all three chemotherapy regimens, recurrence was observed. Systemic chemotherapy should be reserved for patients who failed in primary treatment or those with metastatic disease. However, multisite clinical trials should be developed to rationalize optimal treatment strategies for this uncommon disease.

Clinical pathologic characteristics of extranodal follicular dendritic cell sarcoma / 中华肿瘤杂志

Objective@#To investigate the clinical pathologic characteristics of extranodal follicular dendritic cell sarcoma (FDCS).@*Methods@#We collected 7 cases of extranodal FDCS, HE staining, immunohistochemical study were performed. The V600E mutation of BRAF in 7 cases were detected by real-time PCR and EBER in situ hybridization was performed on 4 cases.@*Results@#Among the 7 cases of FDCS, 5 cases were male and 2 cases were female, the median age was 55 years old, including 4 cases of low-grade FDCS and 3 cases of high-grade FDCS. The tumor location of 2 cases was in mediastinum, the tumor locations of others were in nasopharynx, kidney, lung, rectum and liver, respectively. The results of immunohistochemistry showed that, the tumor cells were diffusely or focally positive for CD21, CD23, CD35, D2-40, EGFR and CXCL13, but negative for S-100, CD68, HMB45, SMA, Desmin, CD117, Dog-1, CD34, CD30, EMA and CK.Five cases were positive for PD-L1 and the its expression in high-grade FDCS were higher than that in low-grade FDCS.Two cases of low-grade FDCS were positive for BRAF V600E, but the BRAF V600E mutation weren′t detected in all of 7 cases. The result of EBER in-situ hybridization showed that only the nasopharynx FDCS was positive.The follow-up information of 5 patients were available (7~43 months), 4 patients died and 1 still alive with rectum metastasis.@*Conclusions@#FDCS is a rare malignant disease with relapse and metastatic tendency. The combined applications of the first-line antibodies including CD21, CD23, CD35 and second-line antibodies including D2-40, CXCL13, EGFR are helpful for its diagnosis and differential diagnosis. The high expression of PD-L1 implicates the potential benefit of FDCS patients acquired from immunotherapy.

Sarcoma de células dendríticas foliculares: una entidad poco frecuente / Follicular dendritic cell sarcoma: an unsual entity

Los sarcomas de células dendríticas foliculares son neoplasias linfoides extremadamente raras. Afectan primordialmente a ganglios linfáticos con compromiso extranodal ocasional. El diagnóstico defini-tivo requiere inmunohistoquímica. Su comportamiento clínico, el tratamiento, así como su evolución resultan poco conocidos. Presentamos el caso de un paciente al que se le diagnosticó un sarcoma dendrítico folicular con afectación axilar.

Folicular dendritic cell sarcoma is an extremelly rare lymphoid neoplasm. Lymph nodes are predominantly afected, but occasionallu extranodal compromise is seen. Definitive diagnosis requires confirmaton by inmunohistochemistry. The clinical features and management are not well know. We present the case follicular dendritic cell sarcoma with axilary afectaton.

Recurrent Follicular Dendritic Cell Sarcoma of the Parotid Gland Imaged with 18F-FDG PET/CT / 대한핵의학회잡지

Follicular dendritic cell sarcoma (FDCS) is an extremely rare tumor with only 67 cases of head and neck FDCS reported in the literature. A 65-year-old female had a 6-cm follicular dendritic cell sarcoma resected from the left parotid gland with close margins. It recurred 1 year later as a 5-cm mass that was intensely [18F] fluoro-2-deoxy-D-glucose (18F-FDG) avid on positron emission tomography/computed tomography (PET/CT) and was re-excised. A follow-up PET/CT did not show any metastatic disease. The use of 18F-FDG PET/CT in the management of FDCS warrants further research. We present the 18F-FDG PET/CT imaging findings of this rare tumor.

Inflammatory pseudotumor-like follicular dendritic cell tumor: an underdiagnosed neoplasia

Follicular dendritic cell (FDC) tumor is an uncommon neoplasm. It generally presents as a slow-growing, painless mass, without systemic symptoms. Histological features usually include low grade spindle cell proliferation. This tumor occurs primarily in lymph nodes, especially cervical and axillary, however, involvement of extranodal sites such as the tonsils, spleen, liver, and gastrointestinal tract has been reported. Inflammatory pseudotumor-like follicular dendritic cell tumor (IPT-like FDCT) is a rare, distinctive histological subtype of this low-grade malignant neoplasm, with consistent Epstein-Barr virus (EBV) association. The differential diagnosis with other fibro-inflammatory tumor proliferations, as inflammatory pseudotumor (IPT) and inflammatory myofibroblastic tumor (IMT), may be challenging. In the present article, two cases of IPT-like FDCT of the spleen are presented, with a broad overview of the literature: one 77-year-old male and one 70-year-old female. A large immunohistochemical panel should be used for diagnosis, as no single specific and totally sensitive markers are available, including markers for CD21, CD23, CD35, CNA42, and clusterin. Individual cases may express one or more of these markers, so that all of them should be investigated. In situ hybridization for EBV is constantly positive. Immunostaining for ALK should be negative, as it is present in roughly half of the cases of IMT. This panel should be used in combination of clinical, laboratory, and topographic evidences. Importantly, inclusion of this lesion as a possible option in clinical and pathological investigation represents the basis for a correct diagnosis (AU)

Follicular dendritic cell sarcoma: report of two cases and literature review / Sarcoma de células dendríticas foliculares: relato de dois casos e revisão da literatura

ABSTRACTFollicular dendritic cell sarcoma is a rare neoplasm, first described in 1986 by Monda. Case 1: A female patient, 50-year-old performed abdominal computed tomography scan that detected a tumor lesion of 8.0 cm in the mesentery. She underwent resection of the lesion. Microscopic examination revealed epithelioid neoplasm, interspersed with lymphocytes, and positive immunohistochemical staining for CD21 and CD35. The patient underwent adjuvant chemotherapy. Case 2: A male patient, 21-year-old presented right-sided neck mass measuring 7.0 cm. The biopsy revealed proliferation of spindle cells, interspersed with inflammatory infiltrate and storiform arrangement, and positive immunohistochemical staining for CD21 and CD23. The patient underwent neoadjuvant radiotherapy and surgical resection.

RESUMOSarcoma de células dendríticas foliculares é uma neoplasia rara, descrita pela primeira vez em 1986 por Monda. Caso 1: Paciente do sexo feminino, 50 anos, realizou tomografia computadorizada de abdômen que detectou lesão tumoral de 8,0 cm em mesentério. Foi submetida à ressecção da lesão. A microscopia revelou neoplasia epitelioide, com linfócitos de permeio e expressão imuno-histoquímica de CD21 e CD35. A paciente foi submetida à quimioterapia adjuvante. Caso 2: Paciente do sexo masculino, 21 anos, com massa cervical direita medindo 7,0 cm. A biópsia evidenciou proliferação de células fusiformes, com infiltrado inflamatório de permeio e arranjo estoriforme, com expressão imuno-histoquímica de CD21 e CD23. O paciente foi submetido a radioterapia neoadjuvante e ressecção cirúrgica.

Comparison of diagnostic values of Clusterin, CXCL13, Podoplanin, CD21 and CD35 in foll-cular dendritic cell sarcoma / 临床与实验病理学杂志

Purpose To evaluate the diagnostic values of Clusterin, CXCL13, Podoplanin (D2-40), CD21 and CD35 in follcular den-dritic cell sarcoma. Methods The expression levels of 10 cases of follcular dendritic cell sarcoma ( FDCS) and 12 types of FDCS mimics (83 cases in total) were investigated by immunohistochemical methods, the latter including solitary fibrous tumor, leiomyosar-coma, gastrointestinal stromal tumor and others. The diagnostic validities of the five biomarkers were compared. Results ( 1 ) The positive rates of Clusterin, CXCL13, D2-40, CD21 and CD35 in the FDCS group were 100%, 70%, 60%, 90% and 80%, respec-tively, the corresponding rates in the control group were 30%, 4%, 11%, 2% and 0 in turn. (2) The five biomarkers could be cate-gorized into 3 groups, according to their diagnostic values in FDCS. The first group included CD21 and CD35, which had much higher sensitivities (90%, 80%), specificities (100%, 98%) and accuracies (98%, 96%), compared with the other biomarkers. The second group included CXCL13 and D2-40, which had a relatively lower sensitivities (70%, 60%), specificities (96%, 89%) and accuracies (94%, 86%), compared with CD21 and CD35. The third group included Clusterin, which had the highest sensitivity (100%), while the specificity (70%)and accuracy (73%) were inferior to the first and second groups. (3) The diagnostic values of CD21 and CD35 combination were 100%, 98%, 98%, 83% and 100%, respectively. Conclusions (1) CD21 and CD35 are the most valuable biomarkers for FDCS. The combined diagnostic effect of the two markers is generally superior to that of single marker. (2) Clusterin has the highest sensitivity for FDCS. However, the frequent expression in FDCS mimickers restricts its diagnostic values for FDCS. (3) CXCL13 and D2-40 may be used as a marker for FDCS, but are not recommended as the first selection based on their diagnostic performance. (4) On the reasons that FDCS mimickers may not uncommonly express Clusterin and D2-40, and rarely show positivity for CD21 or CXCL13, more attention should be paid to the phenomenon to avoid misdiagnosis.

Differential Diagnostic Value of Morphological Changes of Follicular Dendritic Cell Meshwork between Different Subtypes of Lymphoma / 现代检验医学杂志

Objective To explore the differentiated diagnostic value of the morphological changes of follicular dendritic cell (FDC)meshwork between different subtype of lymphoma.Methods CD21 was stained by immunohistochemistry (IHC) method,FDC meshwork pattern was studied in 5 6 cases of various lymphomas(including 8 cases of diffuse large B cell lym-phoma,2 cases of burkitts lymphoma,6 cases of small lymphocytic lymphoma,6 cases of plasmacytoma,3 cases of MALT lymphoma,6 cases of peripheral T cell lymphoma,3 cases of anaplastic large cell lymphoma,8 cases of NK/T cell lympho-ma,4 cases of follicular lymphoma,3 cases of mantle cell lymphoma,3 cases of AITL,2 cases of FDC sarcoma).Results FDC meshwork in the morphological changes of various subtypes of lymphoma could be classified into four patterns:①FDC form a disappeared and disintegrated meshwork,most of the lymphoma FDC meshwork fully or partially destroyed,including diffuse large B cell lymphoma,burkitt lymphoma,small lymphocytic lymphoma,plasmacytoma,peripheral T cell lymphoma, anaplastic large cell lymphoma,NK/T cell lymphoma;②FDC meshtwork existence,even hyperplasia,including follicular lymphoma,mantle cell lymphoma,MALT lymphoma;③FDC meshtwork proliferation,disorder and deformation,such as AI-TL;④Full expression subtype:such as FDC sarcoma.Conclusion The morphologic pattern of the FDC meshwork in lym-phomas of follicular origin was differs according to the lymphoma subtypes,and it has important clinical value in lymphoma differential diagnostic.

Extranodal Follicular Dendritic Cell Sarcoma Involving Tonsil

Follicular dendritic cell sarcoma (FDCS) is a rare neoplasm arising from lymph nodes as well as extranodal sites. Despite the characteristic histopathological features and distinctive immunophenotype, extranodal FDCS are often misdiagnosed initially as undifferentiated carcinoma, inflammatory pseudotumour, meningioma, metastatic malignant melanoma, ectopic thymoma, etc., because of its rarity and lack of awareness. Correct diagnosis of this tumour is imperative given its potential for recurrence and metastasis. We report a case of tonsillar FDCS in a 30-year-old lady who presented with slowly progressing throat pain and dysphagia for a duration of one year. Local examination showed an enlarged left tonsil with an ulceroproliferative growth. The right tonsil was normal. There was no regional lymphadenopathy. Histopathological examination of the tonsillectomy specimen showed a 2.2 x 1.5 cm infiltrative tumour composed of ovoid to spindle cells arranged in characteristic storiform, interlacing fascicular and diffuse patterns. The tumour cells were immunopositive for CD21, CD23, CD35, and S-100 protein and negative for cytokeratin. The Ki-67 antigen-labelling index (Ki-67 LI) was 6%. The EBV status was negative. It was classified as a low risk FDCS. The patient was lost to follow-up after 6 months.

Follicular Dendritic Cell Sarcoma of the Inflammatory Pseudotumor-like Variant Presenting as a Colonic Polyp

Follicular dendritic cell (FDC) sarcoma is rare and is classified either as conventional type or inflammatory pseudotumor (IPT)-like variant. Extranodal presentation is uncommon and nearly all gastrointestinal FDC tumors are of the conventional type. IPT-like variant tumors occur almost exclusively in the liver and spleen and are consistently associated with Epstein-Barr virus (EBV). Here we report the case of a 78-year-old woman with an IPT-like FDC sarcoma presenting as a pedunculated colonic polyp. Histologically, scanty atypical ovoid to spindle cells were mixed with a background of florid lymphoplasmacytic infiltrate, which led to an initial misdiagnosis of pseudolymphoma. These atypical cells expressed CD21, CD23, CD35, and D2-40, and were positive for EBV by in situ hybridization, confirming the diagnosis. The patient was free of disease five months after polypectomy without adjuvant therapy. Although extremely rare, the differential diagnosis for colonic polyp should include FDC sarcoma to avoid an erroneous diagnosis. A review of the 24 cases of IPT-like FDC sarcoma reported in the literature reveal that this tumor occurs predominantly in females with a predilection for liver and spleen, and has a strong association with EBV.

Transformation of Castleman's Disease into Follicular Dendritic Cell Sarcoma, Presenting as an Asymptomatic Intra-abdominal Mass / 대한소화기학회지

Follicular dendritic cell (FDC) sarcoma is an extremely rare malignant neoplasm arising from FDCs. The exact origin of FDCs remains unclear; both a hematopoietic lineage origin and a stromal cell derivation have been proposed. Proliferation of FDCs can lead to benign reactive lesions or generate neoplastic conditions. The lesions are most commonly found in lymph nodes and usually involve the head and neck area. Castleman's disease is a rare non-neoplasitic lymphoproliferative disorder. Rare cases of hyaline-vascular Castleman's disease have been associated with FDC sarcoma, but a clonal relationship has not been convincingly demonstrated. A pathway toward tumor evolution, beginning with hyperplasia and dysplasia of FDCs, has been proposed. Despite this known association between Castleman's disease and FDC sarcoma, there have only been few reported cases of sarcoma arising as a complication of pre-existing Castleman's disease, especially in abdominal lesions. We describe here a 51-year-old female with an FDC sarcoma arising from unicentric, hyaline-vascular type Castleman's disease in an intra-abdominal mass. Pathologically, the lesion showed a series of changes during the process of transformation from Castleman's disease to FDC sarcoma.

Follicular Dendritic Cell Sarcoma of the Omentum: Multidetector Computed Tomography Findings

We report computed tomography (CT) findings for a rare case of follicular dendritic cell sarcoma of the greater omentum from a 47-year-old female patient. The tumor presented ash a palpable mass lesion in the umbilical region for the last two months. Multidetector CT scan of the abdomen showed a 14-cm soft-tissue mass with calcification and necrosis within the greater omentum. As a result, a follicular dendritic cell sarcoma should be considered in the differential diagnosis of a solitary omentum mass, especially one with coarse and chunk-like calcifications.

Syntenin Is Expressed in Human Follicular Dendritic Cells and Involved in the Activation of Focal Adhesion Kinase

Syntenin is an adaptor molecule containing 2 PDZ domains which mediate molecular interactions with diverse integral or cytoplasmic proteins. Most of the results on the biological function of syntenin were obtained from studies with malignant cells, necessitating exploration into the role of syntenin in normal cells. To understand its role in normal cells, we investigated expression and function of syntenin in human lymphoid tissue and cells in situ and in vitro. Syntenin expression was denser in the germinal center than in the extrafollicular area. Inside the germinal center, syntenin expression was obvious in follicular dendritic cells (FDCs). Flow cytometric analysis with isolated cells confirmed a weak expression of syntenin in T and B cells and a strong expression in FDCs. In FDC-like cells, HK cells, most syntenin proteins were found in the cytoplasm compared to weak expression in the nucleus. To study the function of syntenin in FDC, we examined its role in the focal adhesion of HK cells by depleting syntenin by siRNA technology. Knockdown of syntenin markedly impaired focal adhesion kinase phosphorylation in HK cells. These results suggest that syntenin may play an important role in normal physiology as well as in cancer pathology.

Inflammatory pseudotumor-like follicular dendritic cell tumor of liver and spleen: a clinicopathological study / 中华肝胆外科杂志

Objective To study the clinicopathological features and biological behavior of inflammatory pseudotumor-like follicular dendritic cell tumor.Methods We studied the clinical data,HE sections,immunohistochemical staining,Epstein-Barr virus encoded nuclear RNA(EBER)in situ hybridization and outcome of one patient with inflammatory pseudotumor-like follicular dendritic cell tumor of liver,and thirteen patients with inflammatory pseudotumor of liver and spleen treated at the Shengjing Hospital of China Medical University from 2001 to 2010.Results Among the thirteen inflammatory pseudotumors,we diagnosed 1 patient with inflammatory pseudotumor-like follicular dendritic cell tumor of spleen and 1 patient with inflammatory pseudotumor-like follicular dendritic cell tumor of liver using immuno-histochemical staining and EBER in situ by hybridization.The liver case had pathological morphology consistent with those described in the literatures,but the splenic case had specific histologic features.They were both female,and were alive 2.5 and 6 years after operation.Conclusions Inflammatory pseudotumor-like follicular dendritic cell tumor should be distinguished from inflammatory pseudotumor.It is a rare tumor seen mainly in liver and spleen.The diagnosis depends on histopathological and immunohistochemical findings.Inflammatory pseudotumor-like follicular dendritic cell tumor is a low-grade malignant tumor.Surgical excision is the treatment of choice.The two cases provided evidence for its indolent behavior.