Nonalcoholic fatty liver disease: histopathological evaluation and interobserver agreement

BACKGROUND: Nonalcoholic fatty liver disease comprises a spectrum of lesions ranging from steatosis to cirrhosis, with nonalcoholic steatohepatitis being the progressive form of the disease. Alcohol intake, viral hepatitis and other liver diseases must be excluded. Liver biopsy is the gold standard for diagnosis of the disease and is the only method able to differentiate nonalcoholic steatohepatitis from simple steatosis, to grade inflammation and to stage fibrosis. AIMS: To analyze the histopathological findings and evaluate interobserver agreement in biopsies previously diagnosed as steatosis or steatohepatitis. METHODS: Seventy needle biopsies were analyzed according to Brunt et al.(4), with modifications in the grading and staging components. Clinical data of patients were collected. Interobserver agreement was calculated based on histopathological findings. RESULTS: Mild nonalcoholic steatohepatitis (grade 1) was the most common form. If fibrosis was detected, stage 1 was the most frequent. Interobserver agreement was very good for macrovesicular steatosis (K W = 0,82) and good for lobular inflammation (K W = 0,68) and fibrosis (K W = 0,73). CONCLUSIONS: The classification of Brunt et al., with modifications, can be applied to diagnosis not only of nonalcoholic steatohepatitis but also of nonalcoholic fatty liver disease, representing a reliable method for use in the daily practice of pathologists.

INTRODUÇÃO: A doença hepática gordurosa não-alcoólica compreende um espectro de lesões que variam da esteatose à cirrose, sendo a esteatoepatite não-alcoólica a forma progressiva da doença. Uso de álcool, hepatites virais e outras doenças hepáticas devem ser excluídos. A biópsia hepática é o padrão-ouro para o diagnóstico da doença, sendo o único método capaz de diferenciar a esteatoepatite da esteatose, graduar a inflamação e estadiar a fibrose. OBJETIVOS: Analisar os achados histopatológicos e avaliar a concordância interobservador em biópsias previamente diagnosticadas como esteatose ou esteatoepatite. MATERIAIS E MÉTODOS: Setenta biópsias por agulha foram analisadas segundo Brunt et al.(4), com modificações nos componentes determinantes da atividade e no estadiamento. Os informes clínicos dos pacientes foram coletados. A concordância interobservador foi calculada com base nos achados histopatológicos. RESULTADOS: Esteatoepatite não-alcoólica discreta (grau 1) foi a forma mais comum. Se havia fibrose, o estágio 1 foi o mais freqüente. Concordância interobservador foi muito boa para esteatose macrovacuolar (KW = 0,82) e boa para inflamação lobular (KW = 0,68) e fibrose (KW = 0,73). CONCLUSÕES: A classificação de Brunt et al., com modificações, pode ser usada para o diagnóstico não somente da esteatoepatite não-alcoólica, mas também da doença hepática gordurosa não-alcoólica, representando método confiável para uso na rotina diária dos patologistas.

Hepatitis C, HCV genotypes and hepatic siderosis in patients with chronic renal failure on haemodialysis in Brazil.

BACKGROUND: The aim of this study was to investigate the HCV genotypes, hepatic siderosis, inflammatory activity and fibrosis of the liver in patients with chronic renal failure (CRF) on haemodialysis in Brazil. METHODS: A cohort of 72 CRF patients was compared with a group of 65 candidates for blood donation (CBD). For the subjects selected, who tested positive for anti-HCV antibodies and were HCV-PCR positive, a protocol with epidemiological, clinical and laboratory information was completed. An ultrasound-guided liver biopsy was performed and histological analysis of liver fragments was carried out. The presence of HCV-RNA in plasma was established by nested-RT-PCR. The genotype was determined by Restriction Fragment Length Polymorphism (RFLP) analysis of the PCR product. RESULTS: HCV genotype 1 was predominant in both groups, but genotype 2 was the second most common amongst CRF patients, and there was a significant difference when compared with the CBD group (P=0.016). Regarding inflammation and fibrosis, no significant difference was observed in the histology of the liver between the study groups. Siderosis of the liver was more prevalent in the CRF group (P=0.000). Severe complications of liver biopsies were reported in 10 CRF patients (13.2%). CONCLUSIONS: Genotype 2 was observed more frequently in the haemodialysis group. No statistically significant difference was detected between the CRF and CBD groups with regard to both inflammatory response and liver fibrosis. Hepatic siderosis has been attributed to excessive iron administration. As percutaneous liver biopsy resulted in severe complications, we suggest that other procedures of evaluating liver damage in CRF patients should be looked at thoughtfully.

The renin-angiotensin system in a rat model of hepatic fibrosis: evidence for a protective role of Angiotensin-(1-7).

BACKGROUND/AIMS: The circulating renin-angiotensin system (RAS) [plasma renin activity (PRA), Angiotensin (Ang) I, Ang II and Ang-(1-7)] was evaluated in a model of hepatic fibrosis in rats. To investigate the pathophysiological involvement of Ang-(1-7), animals were treated with the Ang-(1-7) Mas receptor antagonist, A-779. METHODS: RAS components, liver function and histology were examined in male Wistar rats (220-300 g). Animals were submitted to sham-surgery or ligature of the bile duct and evaluated 1, 2, 4 and 6 weeks later. Blood samples were obtained to determine biochemical parameters and RAS components. A second group was treated with A-779 or vehicle to measure liver hydroxyproline and total transforming growth factor beta-1 (TGFbeta1). RESULTS: PRA and Ang I were significantly elevated in rats at 4 and 6 weeks compared to sham-operated animals. Ang II and Ang-(1-7) progressively increased over the 6 weeks. Changes in RAS profile correlated with histological signs of fibrosis and deterioration in liver function. Pharmacological blockade of the Ang-(1-7) receptor aggravated liver fibrosis with a significant elevation in hydroxyproline and total TGFbeta(1). CONCLUSIONS: Hepatic fibrosis was associated with RAS activation in our model. Our data also suggested that Ang-(1-7) played a protective role in hepatic fibrosis.

Roux-en-Y gastric bypass improves the nonalcoholic steatohepatitis (NASH) of morbid obesity.

BACKGROUND: Hepatic steatosis and nonalcoholic steatohepatitis (NASH) have been increasingly implicated in the genesis of hepatic fibrosis and cirrhosis. However, no consensus exists about whether weight reduction may reverse this process. METHODS: To assess the effect of Roux-en-Y gastric bypass (RYGBP) on the histological evolution of NASH diagnosed in 64 patients by routine liver biopsy ("first" biopsy) performed during surgery, we performed a "second" biopsy after 23.5 +/- 8.4 months in 16 patients (14 female, 2 male). RESULTS: From the first to the second biopsy, BMI decreased from 53.4 +/- 8.8 kg/m2 to 31.1 +/- 4.7 kg/m2, arterial hypertension decreased from 75% to 43.8%, and type 2 diabetes decreased from 43.8% to zero. On the first biopsy, nonalcoholic fatty liver disease (NAFLD) type 3 was observed in 12 patients (75%) and type 4 in 4 (25%). The second biopsy revealed complete regression of NAFLD in 15 patients (93.7%) and only 1 (6.3%) had NAFLD type 1 (mild steatosis without inflammation). Complete regression of necroinflammatory activity was observed in all patients. Among the 4 patients presenting fibrosis in the first biopsy, complete remission was observed in 1 and improvement in 1. Two continued to show the same degree of fibrosis without evidence of disease activity. No worsening of steatosis, necroinflammatory activity or fibrosis was observed in any of the patients, and none progressed to cirrhosis. CONCLUSION: RYGBP improves steatosis, necroinflammatory activity and hepatic fibrosis in patients with morbid obesity and NASH.

Cirrhotic liver explants: regenerative nodule, dysplasia and hepatocellular carcinoma occurrence

The detection of hepatic nodules by imaging techniques in cirrhotic patients has increased and the growing consensus that these lesions may be premalignant increases their clinical importance and demands precise diagnostic criteria. The prevalence of macroscopic suspect hepatic nodule (MSHN) in cirrhotic livers was analyzed to identify macroregenerative nodule (MRN), dysplastic nodule and hepatocellular carcinoma (HCC) and to evaluate an association between MSHN and HCC. Hepatic nodules larger than 1cm and different from the surrounding nodules of the cirrhosis in color and texture were considered MSHN. Sixty-one cirrhotic liver explants were serially sectioned into 0.5 to 0.7cm slices and MSHN and protocol samples were examined histologically. Ninety-four MSHN were identified in 26 livers (histologically 11 were cirrhotic nodules, 61 MRN, 12 dysplastic nodules, and ten HCC). HCC was identified macroscopically in one liver and by light microscopy within MSHN in six other livers. The relation between HCC and MSHN, specifically MRN, was statistically significant. These findings suggest an association between MRN and MSHN with HCC in cirrhotic livers and reinforce the practical importance of histological classification of hepatic nodules in cirrhosis in order to guide the management of patients who are waiting for liver transplant or surgical treatment.

A detecção de nódulos hepáticos por técnicas de imagem em pacientes com cirrose tem aumentado, e o consenso de que essas lesões podem ser pré-malignas aumenta sua importância clínica e demanda critério diagnóstico preciso. A prevalência de nódulos hepáticos macroscopicamente suspeitos (NHMS) em fígados com cirrose foi analisada para identificar macronódulo regenerativo (MNR), nódulo displásico e carcinoma hepatocelular (CHC) e para avaliar a associação de NHMS e CHC. Nódulos hepáticos maiores que 1cm com cor e textura diferentes dos demais nódulos da cirrose em cada peça foram definidos como NHMS. Sessenta e um fígados explantados por cirrose foram seccionados em fatias de 0,5 a 0,7cm e NHMS e amostras de áreas aleatórias do fígado foram examinadas histologicamente. Noventa e quatro NHMS foram identificados em 26 fígados (à histologia 11 foram nódulos típicos da cirrose; 61, MNR; 12, nódulos displásicos; e dez, CHC). O CHC foi identificado macroscopicamente em um fígado e pela microscopia óptica em NHMS em seis outros. A relação entre CHC e NHMS, especificamente MNR, foi estatisticamente significante. Esses achados sugerem associação entre MNR e NHMS com o CHC em fígados com cirrose e reforçam a importância prática da classificação histológica dos nódulos na cirrose, com o propósito de orientar a conduta médica no manuseio de pacientes que estão à espera de transplante hepático ou de tratamento cirúrgico.

Successful management of concomitant omphalocele, accessory hepatic lobe, and biliary atresia in a 44-day-old boy.

We report the second case in literature of a boy with the association of large omphalocele, accessory hepatic lobe, and biliary atresia, and the first successful treatment. The patient was submitted to a surgical treatment at 44 days of life, including Kasai procedure, correction of the remnant abdominal wall defect, and removal of a hepatic accessory lobe. The boy evolved with normalization of hepatic function tests. After 15 years of follow-up, the patient is completely healthy, weights 45 kg, and is 1.64 m tall.

Hepatic histopathology of patients with morbid obesity submitted to gastric bypass.

BACKGROUND: The authors analyze and describe the hepatic histopathology of patients with morbid obesity submitted to gastric bypass. METHODS: A liver biopsy was performed in 112 patients at the beginning of gastric bypass, and clinical data (gender, age, BMI and associated diseases) were obtained from the patient records. RESULTS: Among the patients, 74.1% (n=83) were females and 25.9% (n=29) were males, age 39.59+/-10.12 years, with BMI 48.79+/-7.54. Regarding the diseases associated with morbid obesity, arterial hypertension was observed in 67.9% (n=76) of the patients, joint diseases in 55.4% (n=62), dyslipidemia in 40.2% (n=45), and diabetes type 2 in 27.7% (n=31). 111 patients (99.1%) showed different types of non-alcoholic fatty liver disease (NAFLD) (types 1, 2, 3 and 4), with types 3 and 4 accounting for 57.7% (n=64). A significant association was observed between NAFLD type 4 and diabetes type 2 (P=0.018). The presence of glycogen nuclei was significantly correlated with steatosis (P=0.000), lobular inflammation (P=0.019) and perisinusoidal fibrosis (P=0.000). CONCLUSION: 1) Liver biopsy taken at gastric bypass reveals different types of NAFLD; 2) Diabetes type 2 is associated with NAFLD type 4; 3) Glycogen nuclei are correlated with steatosis, lobular inflammation and perisinusoidal fibrosis; 4) Steatosis represents the basic injury in NAFLD and is associated with hepato-cellular ballooning. 5) In view of the frequency of hepatic alterations, a biopsy should be part of the surgical protocol of morbid obesity, this method being the only one able to determine the presence of lesions and to stage fibrosis.

Aspectos clínicos da hepatite C crônica: experiência do Ambulatório de Hepatites Virais/Instituto ALFA de Gastroenterologia/Hospital das Clínicas da UFMG / Clinical aspects of chronic hepatitis C: experience of the Ambulatório de Hepatites Virais/Instituto ALFA de Gastroenterologia/Hospital das Clínicas da UFMG/MG/Brazil

Este estudo retrospectivo investigou os aspectos clínicos de 295 pacientes com hepatite C crônica. A idade variou entre 13 e 81 anos (mediana=49 anos) sendo 55% entre 40 a 60 anos. O fator de risco principal foi hemotransfusão, seguido pelo uso de drogas injetáveis. A maioria dos casos era assintomática. Cinqüenta por cento dos pacientes apresentavam complicações da cirrose hepática ao diagnóstico. Não houve associação entre o genótipo e a gravidade da fibrose hepática. Os fenômenos auto-imunes foram diagnosticados em 10% dos pacientes. A ALT estava aumentada em 69% dos casos. Trinta e dois por cento tinham ALT normal e 8% destes eram cirróticos. Somente 26% dos pacientes tratados com interferon mais ribavirina por 48 semanas apresentaram resposta virológica sustentada. Os resultados deste estudo alertam para a alta morbidade da hepatite C no nosso meio.

Clinical aspects of chronic hepatitis C in a retrospective study including 295 patients were studied. The age ranged from 13 to 81 years (mean = 49 years); 55% were 40 to 60 years old. The mainly risk factor to infection was blood transfusion, followed by drug injection. Most patients were asymptomatic but 50% had cirrhosis by the time of diagnosis. Genotype was not related to worse status of fibrosis. Auto-immune events appeared in 10% of patients. High and normal levels of alanine-aminotransferase (ALT) were found in 69% and 32% of the patients, respectively. Eight per cent of the patients with normal levels of ALT were cirrhotic. Only 26% of treated patients had sustained response to virus after treatment with interferon and ribavirin for 48 weeks. The results show a high morbidity.

Ultrastructural aspects of mucosas in endemic pemphigus foliaceus.

OBJECTIVE: To investigate whether ultrastructural changes present in clinically normal oral mucosa could occur in the mucosas of patients with endemic pemphigus foliaceus (EPF) or fogo selvagem (wildfire). PATIENTS: Surgical biopsy specimens were taken from the foreskin of 8 patients with EPF and 3 control subjects, the uterine cervix and vaginal wall of 9 patients with EPF and 2 controls, and the oral mucosa of 5 patients with EPF and 4 controls. The patients received a clinical and histopathologic diagnosis of EPF and all had clinically normal oral and genital mucosas. RESULTS: In the patients with EPF, widening of the intercellular spaces and distended, elongated cytoplasmic projections, the tips of which contained desmosomes and were sometimes disassembled, were evident in all 4 regions studied. At the periphery of the spinous cells, cytoplasmic vesicles apparently containing intact or fragments of desmosomes or half-desmosomes were seen. CONCLUSIONS: The ultrastructural lesions found in the mucosas studied are similar to those previously described in the literature for the oral mucosa of patients with EPF. In the cases of EPF, even though the desmosomal changes occurred in all epithelial layers, blisters did not occur in the mucosas by possible coexpression of desmoglein 1 and desmoglein 3.

Achados histológicos em 48 pacientes transplantados do fígado: biópsias do enxerto pós-reperfusäo (tempo zero) e de três a 15 dias pós-transplante / Histological findings in 48 liver transplants: biopsies after reperfusion (time zero) and three to 15 days after transplantation

Introduçäo: As relaçöes entre a morfologia do enxerto transplantado e a do período pós-transplante säo importantes no acompanhamento dos pacientes e no direcionamento dos tratamentos instituídos. Objetivo: Analisar os achados histológicos do enxerto hepático em biópsiasrealizadas pós-reperfusäo (tempo zero) e naquelas realizadas de três a 15 dias pós-transplante. Materiais e métodos: Noventa e seis biópsias de 48 pacientes foram selecionadas por terem sido colhidas no tempo zero (pós-reperfusäo) e no período compreendido entre o terceiro e o 15º dia pós-transplante, com identificaçäo das lesöes hepatocitárias degenerativas, necrose e atividadeinflamatória. As biópsias pós-transplante foram ainda graduadas quanto ao índice de atividade de rejeiçäo (IAR), segundo o consenso de Banff. Resultados: Osachados histopatológicos mais freqüentes nas biópsias pós-reperfusäo foram de degeneraçäo hidrópica discreta (acometimento de até 50 por cento dos hepatócitos) em 87,5 por cento dos casos e necrose focal intralobular (lítica, apoptose) presente em 75 por cento dos pacientes, em graus variáveis. Nas biópsiasrealizadas pós-transplante encontrou-se degeneraçäo hidrópica discreta também em 87,5 por cento dos casos e rejeiçäo aguda em 38 (79,2 por cento) pacientes. Nestas biópsias com rejeiçäo aguda, chamou atençäo a intensidade da agressäo a ductos biliares em graus moderado (2) e acentuado (3) presentes em 42,1 por cento dos casos, enquanto a endotelialite portal, nestas mesmas intensidades, ocorreu em 21,05 por cento. Conclusäo: Nossos dados evidenciaram lesöes relacionadas à preservaçäo (lesöes do tipo harvesting) nas biópsias pós-reperfusäo. As biópsias pós-transplante revelaram índice de rejeiçäo morfológica na maioria dos casos, como evidenciado na literatura, destacando-se aqui a intensidade da agressäo a ductos biliares

Eficácia da confecção de válvulas colônicas após ressecção retoanal em ratos / Efficacy of colonic valves confection after anorectal resection in rats

OBJETIVO: Testar a eficácia da construção de válvulas colônicas após a ressecção retoanal em ratos, para se obter retardo do fluxo intestinal. MÉTODO: Análise clínico-evolutiva, radiológica e anatomopatológica de 31 ratos submetidos a duas seromiotomias circunferenciais transversais no cólon com invaginação sero-serosa e ressecção retoanal, com colostomia perineal. RESULTADOS: Sete ratos morreram no pós-operatório e, necropsiados, apresentavam impactação fecal. Houve redução do peso corporal e fecal no pós-operatório imediato (estatisticamente não significante), seguida de aparente normalização dos valores. Fecalitos aderidos uns aos outros foram freqüentes. Dos 24 animais radiografados, em oito, ao menos uma das válvulas estava visível. Após a necropsia de 21 ratos, constatou-se o predomínio absoluto de fezes a montante das válvulas. Macroscopicamente, nem sempre as válvulas foram identificadas. Na microscopia, encontrou-se hipertrofia das fibras musculares e interrupção da camada muscular com alteração na disposição das fibras e fibrose nos locais da seromiotomia. CONCLUSÕES: A operação foi tecnicamente viável. A presença das fezes a montante das válvulas, a eliminação de fezes aderidas, a hipertrofia e a interrupção da camada muscular reforçam a hipótese de que a seromiotomia age como mecanismo frenador, retardando o trânsito intestinal. O modelo experimental não permite aferir sobre continência fecal.

BACKGROUND: The present study intend to test the efficacy of colonic valves construction after the anorectal resection in rats, in order to obtain retardation of the intestinal flow. METHOD: Clinical, radiological and anatomopathological analysis, ranging from 31 rats, submited to a series of two colonic transversal-circunferential seromiotomies, followed by serous-serous invagination and anorectal resection, and a perineal colostomy. RESULTS: Seven rats have died in the post-operatorium and, when necropsied, they presented faecal impactation. There was reduction in both body and faecal weight in the immediate post-operatorium period (statistically not significant), followed by an apparent normalization of the values. Small stool were found frequently joined together. In eight animals, from twenty-four which underwent radiograph, at least one valve was visible. After the necropsy of 21 rats, there was a major predominance of faeces above the valves. Macroscopically, the valves were not identified quite often. Microscopically, hipertroph in muscle fibers and interruption in muscle lay with alteration in fibers disposition and fibrosis in the places of seromiotomy, were commomly found. CONCLUSIONS: The operation can be considered as being tecnically viable. The presence of faeces above the valves, the elimination of joined stools, the hipertrophy and interruption of muscle layer, all emphasize the hypothesis that seromiotomy acts as a braking mechanism, retarding the intestinal flow. The experimental model adopted does not allow us to make any gauging regarding to faecal continence.

Sessão anatomoclínica dos serviços de clínica médica e anatomia-patológica do Hospital das Clínicas da Universidade Federal De Minas Gerais, necrópsia n°a-22534 / Necropsy a-22534 of clinical-pathologic session of internal medicine and anatomic-pathologic services of Hospital das Clínicas da Universidade Federal De Minas Gerais

É apresentado um caso de tuberculose disseminada com evolução insidiosa e espontânea. O conjunto sintomatológico intenso associou- se à imunossupressão determinada pela própria tuberculose. O raciocínio médico exige sempre pensar "tuberculosamente" em todas as situações clínicas.

This session shows the clinical aspects of miliary tuberculosis and its immunosuppression.

Necrose progressiva da retina externa (PORN) e neurite quiasmática por varicela-zoster em paciente com AIDS / Progressive outer retinal necrosis and necrotising chiasmatic neurites due to varicela-zoster in AIDS patient

Objetivo: Esclarecer a etiologia de neurite óptica quiasmática e de necrose progressiva da retina externa (PORN) em pacientes com AIDS. Local: Serviço de Uveites do Hospital Säo Geraldo (UFMG), departamento de Anatomia Patológica da Faculdade de Medicina da UFMG e Departamento de Neuropatologia e Neuroquímica da Universidade de Viena, Austria. Método: Cérebro, retinas e quiasma Wptico foram submetidos à avaliaçäo anatomo-patológica, ultra-estrutural, imunocitoquímica e hibridizaçäo in situ. Resultado: Cistos de Toxoplsma gondi foram encontrados no cérebro. A midroscopia eletrônica evidenciou particulas características do grupo herpes e a imunocitoquímica confirmou a presença do VZV como causa da retinite e leucoencefalopatia necrosante. Conclusäo: A neurite óptica pelo VZV pode ser a causa de comprometimento de acuidade e/ou campo visual em um paciente com AIDS, e sua presença alerta para o risco de retinite fulminante pelo mesmo agentes Seu diagnóstico indica o Tratamento imediato com drogas anti-zoster visando um prognóstico menos sombrio (au)

Estudo, ao microscópio óptico e eletrônico, do rim de cäes natural e experimentalmente infectados com Leishmania (Leishmania) chagasi / Optical and electron microscopic study of the kidney of dogs naturally and experimentally infected with Leishmania (Leishmania) chagasi

Os autores estudaram os rins de 4 cäes infectados con Leishmania (Leishmania) chagasi. Dois animais (um macho e uma fêmea) naturalmente infectados foram sacrificados 18 meses após sua permanencia no laboratório. Dois machos foram inoculados por via endovenosa, com 1x10***6 promastigotas da cepa MHO/BR/70/BH46 e sacrificados após 18 meses e 2 anos, respectivamente. Em todos os animais os rins estavam lesados. As alteraçöes encontradas foram: (1) glomerulonefrite mesangioproliferativa focal ou difusa, com pronunciada hipertrofia e hiperplasia das células mesangiais e com alargamneto da matriz; (2) espessamento da membrana basal com depósitos eletrodensos; (3) nefrite intersticial intertubular crônica com exsudaçäo plasmocitária intensa. (4) degeneraçäo albuminosa dos túbulos renais. Baseados nos achados os autores discutem os prováveis mecanismos patogenéticos

Envolvimento renal na associaçäo Salmonella-Schistosoma mansoni / Renal involvement in the association of Salmonelosis with Schistosoma mansoni

Vinte pacientes com a associaçäo Salmonella-S. mansoni (Grupo 1) e 20 com esquistossomose mansoni hepatesplênica (Grupo 2) foram selecionados para o estudo. Submeteram-se os pacientes dos Grupos 1 e 2 a exame clínico minucioso e a uma série de exames complementares, com destaque para as provas de funçäo renal. Em 10 pacientes do Grupo 1 e 20 do Grupo 2, realizou-se, ainda, estudo histológico do rim à microscopia óptica, de fluorescência e eletrônica. As alteraçöes renais foral mais freqüentes nos pacientes do Grupo 1. Após o tratamento dos pacientes do Grupo 1, com antibióticos e/ou esquistossomicidas, observou-se regressäo das alteraçöes renais sob o ponto de vista clínico, laboratorial e imunopatológico. Os autores concluem pela existência de duas nefropatias distintas: a nefropatia esquistossomótica e a encontrada em pacientes com a associaçäo Salmonella-S. mansoni

Encefalite herpética do tronco encefálico: relato de um caso autopsiado com estudo imuno-histoquímico e ao microscópio eletrônico / Herpetic brain stem encephalitis: report of an autopsied case with immunohistochemical and electron microscopy study

É apresentado um caso autopsiado de encefalite herpética do tronco encefalico. Clinicamente o paciente apresentou de início cefaléia, seguida de ataxia, sonolência e paralisias múltiplas de alguns nervos cranianos, evoluindo para a morte em 8 dias. O exame anatomopatológico do encéfalo mostrou encefalite necrosante em focos múltiplos limitada ao tronco encefálico, mais acentuada na ponte e bulbo. A técnica da imunoperoxidase revelou raras células gliais com imunorreatividade intranuclear para antígeno do herpes. Raras partículas virais com as características morfológicas do herpesvírus foram identificadas nos núcleos de células nervosas em material fixado em formol a 10%. Este caso é o segundo relatado de encefalite herpética do tronco do encéfalo confirmado pelo exame anatomopatológico. Comentam-se as vias de chegada do herpesvírus ao sistema nervoso central e sua posterior disseminaçäo, após período de latência e reativaçäo, para a cavidade oral, regiäo órbito-frontal, lobos temporais e tronco encefálico