Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Diagn Cytopathol ; 47(3): 187-193, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30499203

RESUMO

BACKGROUND: Thyroid nodules are very common. Ultrasound (US) and fine needle aspiration (FNA) are both integral in cancer screening. This study investigated the concordance between thyroid nodule sizes measured by US and gross pathologic examination and their relationship with malignancy. METHODS: A retrospective design was used to select consecutive patients with proven carcinoma of the thyroid. The number and maximum diameter of nodules, rates and types of malignancy, as well as predictors of malignancy were determined. RESULTS: The 10 944 patients examined had 15 283 thyroid nodules, 44.6% of which were malignant. Of the 4449 nodules sampled by FNA and the 8748 not sampled by FNA, 76.5% and 30.5% were malignant, respectively. The sensitivity, specificity, positive and negative predictive values (NPVs), and overall accuracy of FNA based on final pathology were 97.9%, 96.3%, 98.8%, 93.5%, and 97.5%, respectively. Nodule sizes determined by US were comparable with most nodules having either the same size range (n = 2959, 77.7%) or differing only by one size range (n = 770, 20.5%). CONCLUSIONS: Thyroid nodule size is inversely related to malignancy risk, as larger nodules have lower malignancy rates. Nodule size estimated by US shows relatively good correlation with final pathologic size. However, thyroid nodules should undergo FNA regardless of size. If the FNA is not benign, nodule size should influence therapeutic decision making.


Assuntos
Nódulo da Glândula Tireoide/diagnóstico por imagem , Nódulo da Glândula Tireoide/patologia , Adulto , Idoso , Biópsia por Agulha Fina , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Sensibilidade e Especificidade , Ultrassonografia
2.
Sci Rep ; 7(1): 15832, 2017 Nov 20.
Artigo em Inglês | MEDLINE | ID: mdl-29158505

RESUMO

The study aimed to investigate the gender-related differences of disease onset, age distribution, blood type, clinical characteristics, and malignant behaviors of differentiated thyroid carcinoma (DTC) in Chinese patients. A total of 7385 consecutive thyroid cancer patients who underwent thyroidectomy were retrospectively reviewed. 4087 (55.3%) were diagnosed as benign and the other (3298, 44.7%) were as malignant. DTC accounted for 97.6% in the malignant tumor. More single nodules turned out to be DTC in male compared to multiple nodules (46.9% vs. 40.4%, P = 0.004). The proportion increased along with the increase of year during 2000-2013, which was from 7.5% to 68.1% in males and from 16.2% to 66.7% in females. The level of preoperative TSH was significantly higher in patients with DTC compared to the patients with benign (1.97 vs. 1.57 mIU/L, P < 0.001). The proportion of thyroid cancer was dominated in blood type B and the lowest incidence in blood type A in male, the difference was not statistically significant. The results showed that age, nodule number, BMI and serum TSH were the related factors for DTC. More aggressive behaviors of DTC were observed in male patients, and more attention should be focused on the timely diagnosis and treatment of these patients.


Assuntos
Adenocarcinoma/epidemiologia , Carcinoma/epidemiologia , Neoplasias da Glândula Tireoide/epidemiologia , Adenocarcinoma/sangue , Adenocarcinoma/patologia , Adenocarcinoma/cirurgia , Adulto , Fatores Etários , Idoso , Tipagem e Reações Cruzadas Sanguíneas , Carcinoma/sangue , Carcinoma/patologia , Carcinoma/cirurgia , China/epidemiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Caracteres Sexuais , Neoplasias da Glândula Tireoide/sangue , Neoplasias da Glândula Tireoide/patologia , Neoplasias da Glândula Tireoide/cirurgia , Nódulo da Glândula Tireoide/patologia , Nódulo da Glândula Tireoide/cirurgia , Tireoidectomia , Tireotropina/sangue , Adulto Jovem
3.
Medicine (Baltimore) ; 94(21): e841, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-26020388

RESUMO

The diagnosis of malignant thyroid nodules is still a clinical challenge. This study aimed to determine the ultrasonographic characteristics of papillary thyroid carcinoma. The ultrasonographic and pathological data of 2453 thyroid nodules in a cohort of 1895 Chinese patients who underwent thyroidectomy from January 2010 to December 2012 were retrospectively reviewed. Anteroposterior and transversal (AP/TR) diameters ≥1, solid structure, infiltrative margins, hypoechoic appearance, and microcalcifications were more common in malignant nodules than in benign nodules (P < 0.01). These ultrasonographic features were independent risk factors of malignancy (P < 0.01) as determined by logistic regression analysis. Based on multivariate analysis, these characteristics were also present in large nodules (diameter >10 mm). However, in small nodules (diameter ≤10 mm), only AP/TR ≥1 and infiltrative margins were independent risk factors of malignancy (P < 0.01). Ultrasonography is of high diagnostic value for malignant thyroid nodules and may help to improve the differential diagnosis. Small and large nodules have distinct ultrasonographic features.


Assuntos
Carcinoma Papilar/diagnóstico por imagem , Carcinoma Papilar/diagnóstico , Carcinoma/diagnóstico por imagem , Carcinoma/diagnóstico , Neoplasias da Glândula Tireoide/diagnóstico por imagem , Neoplasias da Glândula Tireoide/diagnóstico , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Biópsia por Agulha Fina , Calcinose , Carcinoma/cirurgia , Carcinoma Papilar/cirurgia , Criança , China , Diagnóstico Diferencial , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Risco , Câncer Papilífero da Tireoide , Neoplasias da Glândula Tireoide/cirurgia , Ultrassonografia , Adulto Jovem
4.
Zhonghua Nei Ke Za Zhi ; 53(4): 286-9, 2014 Apr.
Artigo em Chinês | MEDLINE | ID: mdl-24857302

RESUMO

OBJECTIVE: To investigate the clinical characteristics of patients with different gender who diagnosed as differentiated thyroid cancers (DTC). METHODS: A cohort of patients with DTC underwent surgery in Chinese PLA General Hospital from October 2001 to may 2011 was retrospectively studied. RESULTS: (1) A total of 1 756 patients with DTC were enrolled in the study and a marked female preponderance was found with the female/male ratio of 2.32: 1. The peak incidence was 35-45 years old in both genders.Higher prevalence of DTC was observed in the male patients with a single nodule than in the males with multinodulars (36.42% vs 28.90%, P < 0.01), while no statistical difference was found in the female patients (33.60% vs 31.77%, P > 0.05). (2) Ultrasound examination revealed that, the female DTC patients with microcalcification thyroid nodules were more than the male patients (69.26% vs 62.62%, P < 0.05), while less in female patients with undefined boundary thyroid nodules (57.79% vs 72.01%, P < 0.01). The tumor size was shown to be smaller in the women than in the men [(1.6 ± 1.3) cm vs (1.8 ± 1.5) cm, P < 0.01]. (3) Higher rates of III/IV TNM Stage, lymph node metastasis and extrathyroidal invasion were found in the men than in the women (21.74% vs 14.51%, P < 0.01, 33.27% vs 23.80%, P < 0.01 and 10.59% vs 7.17%, P < 0.01). CONCLUSION: There is significant gender-related difference of clinical characteristics in the patients with DTC.


Assuntos
Carcinoma/patologia , Neoplasias da Glândula Tireoide/patologia , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Prognóstico , Estudos Retrospectivos , Fatores Sexuais , Nódulo da Glândula Tireoide/patologia
5.
Eur Phys J E Soft Matter ; 36(3): 27, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23515763

RESUMO

Immersed in an ionic solution, a network of polyampholytic polyelectrolyte imbibes the solution and swells, resulting in a polyampholytic p H-sensitive hydrogel, which can respond to changes in the surrounding environmental p H. This paper formulates a continuum field theory for polyampholytic p H-sensitive hydrogels by considering the reaction of hydrogen ions with hydroxide ions, which has been ignored in our previous paper (H.X. Yan, B. Jin, Eur. Phys. J. E 35, 36 (2012)). Comparison with experimental data shows that the proposed continuum field theory, by considering that the reaction of hydrogen ions with hydroxide ions would be more reasonable, can not only give a good qualitative but also a good quantitative prediction of the dependence of swelling on p H and crosslinker. The theory is then applied to study the influence of chain entanglements, salt concentration, uniaxial tension and geometric constraint on mechanical behavior of polyampholytic p H-sensitive hydrogels.

6.
Eur Phys J E Soft Matter ; 35(5): 36, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-22623036

RESUMO

Amphoteric hydrogels contain both ionizable acidic and basic groups attached on the polymer chains, which can change their volume in response to the slight alteration of the surrounding environmental p H. In this paper, a theory of equilibrium swelling of amphoteric p H-sensitive hydrogels which is an extension of the formalism proposed by Marcombe et al. and a new hybrid free-energy density function of amphoteric hydrogels composed of the Edwards-Vilgis slip-link model and the Flory-Huggins solution theory as well as the contributions of mixing the mobile ions with the solvent, and dissociating the acidic and basic groups are presented for the prediction of the influence of environmental solution p H, microstructural parameters and geometric constraints on mechanical behavior. The calculations were modeled on chitosan-genipin gels, and the results were compared to experimental data. Numerical calculations show that the model is able to predict the dependence of swelling on p H and crosslinker qualitatively well and quantitatively close to the experimental data. Each gel shows minimal swelling at low p H but an increase in swelling until a maximum was reached; for most of the p H range, a good fit was achieved except for where the maximum swelling occurs; for experimental data, the maximum swelling appears at about pH = 4 , but for modeled data the maximum swelling appears between pH = 4 and pH = 6 ; each gel swell decreasing with increasing crosslinker concentration was also successfully predicted. The calculated results also show that microstructural parameters and geometric constraints have a significant impact on the mechanical behavior of the amphoteric hydrogels; the gel swells less when the network is more densely entangled and the maximum swelling ratio of the gels under biaxial constraint is only about one-third of the maximum when the gels swell freely. The theory developed here is valuable for the design and optimization of a drug delivery system.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA