Browsing by Subject "Lymph node"

Now showing 1 - 7 of 7
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    CK20 and lymph node involvement predict adverse outcome of malignant intraductal papillary neoplasm of the bile duct
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2020) Shi, Jie; Wan, Xueshuai; Xie, Yuan; Lin, Jianzhen; Long, Junyu; Xu, Weiyu; Liang, Zhiyong; Sang, Xinting; Zhao, Haitao
    Objectives. To identify prognostic factors of malignant intraductal papillary neoplasm of the bile duct (m-IPNB). Materials and Methods. We included 38 consecutive cases which underwent surgical resection and diagnosed as IPNB with malignant component from January 2003 to January 2017. Clinicopathological variables were collected to conduct survival analysis and identify prognostic factors. Results. The median overall survival (OS) of m- IPNB was 76.0 months, with 1-, 3-, and 5-year survival rates of 97.2%, 73.5%, and 59.8%, respectively. The median recurrence-free survival (RFS) was 48.0 months with 1-, 3-, and 5-year RFS rate was 83.2%, 59.8%, and 44.6%, respectively. Univariate analysis showed that elevation of carcinoembrionic antigen (CEA), lymph node involvement, resection margin status, degree of periductal invasion, and positive expression of CK20 were associated with both OS and RFS of m-IPNB. After multivariate Cox models analysis, lymph node involvement and positive expression of CK20 were identified as independent prognostic factors for OS, while lymph node involvement and resection margin status were independent prognostic factors for RFS. The median OS of patients with m-IPNB involving lymphatic metastases and positive expression of CK20 was 27.0±8.8 months and 51.0±12.4 months, respectively. The median RFS of cases with lymph node involvement and R1 resection was 10.0±3.3 months and 25.0±6.9 months, respectively. However, there was no significant difference in OS or RFS between cases of pancreaticobiliary and intestinal subtype. Conclusions. Lymph node involvement and positive expression of CK20 are independent prognostic factors for shorter OS of m-IPNB, while patients with lymph node involvement and positive resection margin are at higher risk of tumor recurrence.
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    Development of immune complex trapping: experimental study of lymphoid follicles and germinal centers newly induced by exogenous stimulants in mouse popliteal lymph nodes
    (Murcia : F. Hernández, 1999) Horie, K.; Chen, D.; Hoshi, H.
    The development of immune complex trapping in newly-induced lymphoid follicles of draining popliteal lymph nodes was investigated in young adult mice, which had been given bilateral injection of hemocyanin (KLH) or phytohemagglutinin (PHA), each absorbed onto alumina. HRP-anti-HRP immune complex was injected into the footpad 1 day before sacrifice. Using three series of semi-serial cryostat sections prepared from each popliteal node, the number of lymphoid follicles in each node was counted, and follicular localization of the in vivo injected and in vitro applied immune complexes in each follicle was determined. By day 5, a large germinal center had developed within each preexisting follicle. A large number of 'new' secondary follicles, each containing a small PNA-positive germinal center, appeared outside pre-existing follicles, from day 5 through day 11 in KLH-treated nodes, and from day 7 through day 14 in PHA-treated nodes. Shortly after their appearance, new secondary follicles showed no in vitro or in vivo trapping, but subsequently, many of the new follicles began to display in vitro trapping, at first weakly but later intensely. Occurrence of in vivo trapping in new follicles took some time and was first recognized when new follicles showed intense in vitro trapping. At day 21 or 25, many of the new follicles showed both in vitro and in vivo trapping. It was concluded that in lymph nodes treated with a stimulant, secondary follicles containing germinal centers can be formed de novo in the extrafollicular zone where the follicular trapping microenvironment is absent, but subsequently the microenvironment capable of trapping immune complexes develops at the site of formation of new follicles.
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    Diagnóstico de metástasis ganglionares de carcinoma papilar tiroideo midiendo tiroglobulina en la aguja de la punción. Cálculo de punto de corte optimo en nuestra serie
    (Elsevier, 2024-07-23) García-Molina, Francisco; Aguera-Sánchez, Alfonso; Peña-Ros, Emilio; Ruiz-Marín, Miguel; Martínez-Pérez, Matias; Chaves-Benito, Asunción; Martínez Díaz, Francisco; Arense Gonzalo, Julián Jesús; Oftalmología, Optometría, Otorrinolaringología y Anatomía Patológica
    La citología por punción aspiración con aguja fina (PAAF) de ganglios sospechosos cervicales de origen incierto es frecuentemente no concluyente y da falsos negativos. Para evaluar la utilidad de medir tiroglobulina en el lavado con suero fisiológico de la aguja de punción para el diagnóstico de metástasis de carcinoma papilar de tiroides, debe calcularse un punto de corte óptimo de tiroglobulina siendo positivo o negativo según los niveles de tiroglobulina fueran superiores o inferiores al punto de corte, respectivamente. Hemos estudiado retrospectivamente 33 pacientes (19 mujeres y 14 varones) de edad media de 49,3 años, con carcinoma papilar de tiroides y sospecha de metástasis ganglionar. De ellos 16 (47,1%) tuvieron una citología de la PAAF positiva. Para determinar la capacidad predictiva de tiroglobulina respecto a metástasis de carcinoma papilar de tiroides se realizó el análisis ROC que dio un área bajo la curva AUC: 0,987 (IC 95%: 0,808-1,000) obteniendo, a partir del índice de Youden, 0,4 ng/ml como punto de corte de tiroglobulina que mejor capacidad predictiva posee. El estudio de la relación entre tiroglobulina y la conservación/no conservación del tiroides mostró diferencias estadísticamente significativas (p = 0,023). Nuestros resultados validan 0,4 ng/ml de tiroglobulina como punto de corte óptimo. Al revisar la bibliografía se ve la gran diversidad de los valores de punto de corte, que se explican por la gran variabilidad interobservador e interensayo principalmente, es por ello que recomendamos calcular el punto de corte óptimo propio de cada laboratorio; y determinar en estudios posteriores dos puntos de corte según se conserve o no tiroides.
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    Further histological observations on popliteal lymph nodes after interruption of the afferent lymphatic vessels
    (Murcia : F. Hernández, 1993) Hoshi, H.; Takemoto, R.; Nagata, H.; Horie, K.; Murakami, G.; Suzuki, S.
    Lymphatic vessels afferent to the popliteal nodes i n young adult rats and guinea pigs were interrupted at the lowest edge of the popliteal fossa, and regressive changes in the nodes occurring 4 to 16 or 18 weeks after surgery were re-examined histologically. In the rat, some popliteal nodes were drained by lymphatic channel(s) from the tail. After surgery, the poplireal nodes without lymphatic channel(s) from the tail underwent regression of all their constit~lent deep cortical units and also the peripheral cortex comprising lymph follicles, until at 18 weeks, the lymphoid organization of the node reached a minimal level. On the other hand, in popliteal nodes having a lymphatic channel from the tail, some deep cortical units and the overlying peripheral cortex underwent hypotrophy, leaving the remaining units and their overlying peripheral cortex little affected. In the guinea pig, the treated nodes underwent progressive atrophy and ultimately became rudimentary, or even vanished, after 16 weeks. Treated rudimentary nodes were composed largely of stromal cells only, and these were replaced to 21 various extent by fat. The present results are discussed in relation to complete and incomplete inhibition of the afferent lymph flowing into the surgically treated nodes.
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    Lymph node or lymphoid aggregate? Impact on cancer resection quality, clinical prognosis, and tumor staging
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2025) Gocht, Andreas; Watermann, Christian; Melzer, Madelaine; Schumacher, Udo
    The clinical outcome of most cancer patients depends on the stage of the primary tumor, the lymph node status, and if distant metastases are present. According to the Union for International Cancer Control (UICC) and the American Joint Committee on Cancer (AJCC), the Tumor Node Metastasis (TNM) classifi-cation of malignant tumors requires the examination of a minimum number of regional lymph nodes for each type of cancer to fulfill the criteria of high-quality surgical oncology. Due to the daily challenge of collecting an appropriate number of lymph nodes and time constraints when processing and assessing tissue samples, pathologists may be tempted to identify every histological lymphoid structure mimicking a lymph node as a “true” lymph node. Faced with this issue, we propose to resolve it by specifying histological characteristics to differentiate lymphoid aggregates from “true” lymph nodes. To find a minimum consensus, we suggest defining as lymph nodes only those lymphoid structures composed of lymphoid cells encapsulated by a complete or incomplete fibrous capsule.
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    SEM and TEM study of caprine superficial lymph nodes
    (Murcia : F. Hernández, 1989) Faroon, O. M.; Henry, R. W.; Al-Bagdadi, F.K.
    The splenic capsule was characteristic, having dense connective tissue. Smooth muscle cells and unmyelinated nerve fibers were observed. Smooth muscle cells were found to be independent of blood vessels in both the capsule and trabeculae. Littoral cells separated the capsule from the subcapsular sinus. Highly branched reticular cells were associated with the sinuses. The cellular components (large and small lymphocytes, plasma and mast cells, and macrophages) of the cortex and medulla were observed and described. No Golgi apparatus was observed in small lymphocytes and two surface types (rough and smooth) were observed on lymphocytes. Russell bodies were not observed in plasma cells. The paracortical postcapillary venule had cuboidal endothelium with microvilli. Two shapes of lymphocytes were seen associated with the endothelium of postcapillary venules.
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    Smooth muscle distribution in the capsule and trabeculae of the caprine superficial cervical lymph node
    (Murcia : F. Hernández, 1987) Faroon, O. M.; Henry, R. W.; Al-Bagdadi, F.K.
    This study centers around the dichotomy found in the literature concerning the presence of smooth muscle cells in the trabeculae and capsule of lymph nodes. Various superficial lymph nodes (mammary, mandibular, popliteal, subiliac, and superficial cervical) of the goat were collected and examined by light and electron microscopy. Smooth muscle cells were demonstrated in the capsule and trabeculae of lymph nodes independent of the blood and lymph vessels