Abordagem cirúrgica de megaceco secundário a tumor de cólon descendente / Surgical approach of megacecum secondary to descending colon tumor

RESUMO: Obstrução intestinal é a manifestação clínica mais frequente de tumores de cólon sendo esses, em sua maioria, localizados no cólon descendente e reto-sigmoide. A cirurgia de emergência para obstrução intestinal é associada a altos riscos de mortalidade e de morbidade e a abordagem ideal permanece controversa. Procedimentos em vários estágios e o uso de stents como ponte para cirurgia são opções promissoras. É apresentado um caso de paciente de 61 anos, com abdome agudo obstrutivo secundário à neoplasia colorretal, com ênfase em seu diagnóstico e tratamento. (AU)

ABSTRACT: Intestinal obstruction is the most frequent clinical manifestation of colon tumors, most of which are located in the descending and recto-sigmoid colon. Emergency bowel obstruction surgery is associated with high mortality and morbidity risks and the ideal approach remains controversial. Multi-stage procedures and the use of stents as bridges for surgery are promising options. A case of a 61-year-old patient with an acute obstructive abdomen secondary to colorectal neoplasm is presented, with emphasis on its diagnosis and treatment. (AU)

The "misfortune" of being a COVID-19 negative patient during the coronavirus pandemic.

COVID-19 pandemic has obviously affected patients' behavior towards seeking medical help as well as physicians' decision in the management of emergencies. Our recent experience as surgeons at a COVID-19 referral hospital revealed cases which share an alerting characteristic: the delay in appropriate management. Unfortunately for COVID-19 negative patients a "coronacentric" health system has been adopted. In view of measures applied to avoid spread of the disease, a significant delay in patients' presentation as well as in their in-hospital management is observed. We present cases where delay in appropriate management affected the patients' outcome and underline the fact that balancing between COVID-19 safety measures and a patient who needs urgent treatment can be very challenging and stressful.

Biomarkers and Their Possible Functions in the Intestinal Microenvironment of Chagasic Megacolon: An Overview of the (Neuro)inflammatory Process.

The association between inflammatory processes and intestinal neuronal destruction during the progression of Chagasic megacolon is well established. However, many other components play essential roles, both in the long-term progression and control of the clinical status of patients infected with Trypanosoma cruzi. Components such as neuronal subpopulations, enteric glial cells, mast cells and their proteases, and homeostasis-related proteins from several organic systems (serotonin and galectins) are differentially involved in the progression of Chagasic megacolon. This review is aimed at revealing the characteristics of the intestinal microenvironment found in Chagasic megacolon by using different types of already used biomarkers. Information regarding these components may provide new therapeutic alternatives and improve the understanding of the association between T. cruzi infection and immune, endocrine, and neurological system changes.

Unusual case of cholecystocolonic fistula secondary to megabowel.

Cholecystocolonic fistula with associated idiopathic megabowel (megacolon and megarectum) is a rare presentation as acute large bowel obstruction. Frequently presenting with chronic constipation, acute bowel obstruction is rarely encountered in the presence of concomitant cholecystocolonic fistula. This presents diagnostic and management difficulties with no consensus on appropriate surgical approach. This case highlights the outcomes following emergency total colectomy and subtotal cholecystectomy as a single-stage procedure for a 68-year-old man presenting with cholecystocolonic fistula secondary to idiopathic megabowel as acute large bowel obstruction.

Chagasic megacolon in Venezuela - case report / Megacólon chagásico na Venezuela

ABSTRACT Chagasic megacolon is the second most frequent cause of manifestation of the digestive forms of Chagas disease (trypanosoma cruzi parasitosis), characterized by progressive pseudo-occlusive symptoms or chronic constipation, caused by an alteration in the functioning of the colonic wall musculature. In Venezuela, cases of chagasic disease reported in the past are referred to chagasic heart disease, this being the first documented case of chagasic megacolon. We broach herein a case of chagasic megacolon in which early diagnosis and prompt surgical treatment led to a successful outcome.

RESUMO O megacólon chagásico é a segunda causa mais frequente de manifestação das formas digestivas da doença de Chagas (parasitose do Trypanosoma cruzi), caracterizado por sintomas pseudo-oclusivos progressivos ou constipação crônica, causado por uma alteração no funcionamento da musculatura da parede do cólon. Na Venezuela, os casos da doença chagásica relatados no passado são referidos como doença cardíaca chagásica, sendo este o primeiro caso documentado de megacólon chagásico. Neste artigo, abordamos um caso de megacólon chagásico no qual o diagnóstico precoce e o tratamento cirúrgico imediato levaram a um resultado bem-sucedido.

An unusual cause of idiopathic megacolon in a juvenile: A case report.

RATIONALE: Idiopathic megacolon (IMC) is a rare condition in young children. The association of indigestible food and IMC has never been mentioned in literature. PATIENT CONCERNS: An 11-year-old boy reported with a 1-year duration of intermittent constipation and abdominal distension after having eaten a large amount of fried sticky rice in 1 consumption. DIAGNOSES: Chronic low colonic obstruction, IMC and malnutrition. INTERVENTIONS: This patient was managed conservatively for 1 week at first. Then he underwent loop ileostomy since conservative therapy was poorly tolerated. Enteral decompression, gut biopsy, peritoneal lavage, and drainage were performed in the same procedure. OUTCOMES: Rapid weight gain was observed 4 months after operation. LESSONS: IMC is difficult to diagnose due to the lack of specific clinical manifestations and pathological features. The protocols for management of IMC remains controversial. To achieve a good long-term outcome, early intervention is recommended.

Chronic Megacolon Presenting in Adolescents or Adults: Clinical Manifestations, Diagnosis, and Genetic Associations.

OBJECTIVE: Chronic megacolon is rarely encountered in clinical practice beyond infancy or early childhood. Most cases are sporadic, and some are familial megacolon and present during adolescence or adulthood. There is a need for diagnostic criteria and identifying genetic variants reported in non-Hirschsprung's megacolon. METHODS: PubMed search was conducted using specific key words. RESULTS: This article reviews the clinical manifestations, current diagnostic criteria, and intraluminal measurements of colonic compliance to confirm the diagnosis when the radiological imaging is not conclusive. Normal ranges of colonic compliance at 20, 30, and 44 mmHg distension are provided. The diverse genetic associations with chronic acquired megacolon beyond childhood are reviewed, including the potential association of SEMA3F gene in a family with megacolon. CONCLUSIONS: Measuring colonic compliance could be standardized and simplified by measuring volume at 20, 30, and 44 mmHg distension to identify megacolon when radiology is inconclusive. Diverse genetic associations with chronic acquired megacolon beyond childhood have been identified.

Acquired isolated hypoganglionosis as a distinct entity: results from a nationwide survey.

PURPOSE: Acquired isolated hypoganglionosis (A-IH) is a late-onset intestinal pseudo-obstruction disorder and shows different pathophysiological findings from congenital isolated hypoganglionosis (C-IH). In this study, we retrospectively examined five cases of A-IH and investigated the features of A-IH. METHODS: Five cases of A-IH were extracted from a nationwide retrospective cohort study in 10 years, from which totally 355 cases of Allied Disorders of Hirschsprung's Disease (ADHD) were collected. RESULTS: Ages of onset were between 13 and 17 years in three cases, and 4 years and 4 months in ones. Initial symptoms were abdominal distension and/or chronic constipation in 4 cases, whereas one exhibited intestinal perforation. Affected lesions varied from case to case, extending various length of intestinal tracts. All cases underwent multiple operations (average: 4.6 times), such as enterostomy, resection of dilated intestines, and/or pull-through. Pathological findings showed the decreased numbers of ganglion cells and degeneration of ganglion cells, whereas the size of the plexus was normal. Currently, all cases were alive and almost all eat regular food without requiring parenteral feeding. CONCLUSION: A-IH is rare, but distinct entity characterized by different clinical courses and pathological findings from those of C-IH. The outcome is considered to be favorable after a resection of affected intestine.

Abdominal compartment syndrome secondary to megarectum and megasigmoid.

A 31-year-old male patient with chronic constipation of unknown aetiology presented emergently with worsening nausea, vomiting and abdominal distension of one week duration. On examination, his abdomen was distended with minimal tenderness. A plain film of the abdomen demonstrated severe faecal loading. The patient was haemodynamically unstable on admission and appeared sick. An urgent CT abdomen and pelvis was conducted showing extensive rectal dilatation and associated proximal colonic stercoral perforation. The patient proceeded straight to theatre for laparotomy as his general condition was deteriorating rapidly. On transfer to the operating table, the patient suffered cardiopulmonary arrest. Resuscitation was immediately commenced. Abdominal compartment syndrome was suspected. Cardiac output was re-established following a midline laparotomy which acted relieve the abdominal pressure. The rectosigmoid faecal content was decompressed via an enterotomy. The perforated segment of transverse colon was resected and an end colostomy fashioned. A year later, the continuity of the bowel was re-established.

Symptoms and diagnostic criteria of acquired Megacolon - a systematic literature review.

BACKGROUND: Acquired Megacolon (AMC) is a condition involving persistent dilatation and lengthening of the colon in the absence of organic disease. Diagnosis depends on subjective radiological, endoscopic or surgical findings in the context of a suggestive clinical presentation. This review sets out to investigate diagnostic criteria of AMC. METHODS: The literature was searched using the databases - PubMed, Medline via OvidSP, ClinicalKey, Informit and the Cochrane Library. Primary studies, published in English, with more than three patients were critically appraised based on study design, methodology and sample size. Exclusion criteria were studies with the following features: post-operative; megarectum-predominant; paediatric; organic megacolon; non-human; and failure to exclude organic causes. RESULTS: A review of 23 articles found constipation, abdominal pain, distension and gas distress were predominant symptoms. All ages and both sexes were affected, however, symptoms varied with age. Changes in anorectal manometry, histology and colonic transit are consistently reported. Studies involved varying patient numbers, demographics and data acquisition methods. CONCLUSIONS: Outcome data investigating the diagnosis of AMC must be interpreted in light of the limitations of the low-level evidence studies published to date. Proposed diagnostic criteria include: (1) the exclusion of organic disease; (2) a radiological sigmoid diameter of ~ 10 cm; (3) and constipation, distension, abdominal pain and/or gas distress. A proportion of patients with AMC may be currently misdiagnosed as having functional gastrointestinal disorders. Our conclusions are inevitably tentative, but will hopefully stimulate further research on this enigmatic condition.

[Rehbein procedure for secondary megacolon in children]. / Operatsiia Rebeina pri vtorichnom megakolon u detei.

AIM: To evaluate the results of Rehbein procedure with extraperitoneal colorectal anastomosis combined with complex conservative treatment in children with secondary megacolon due to chronic constipation. MATERIAL AND METHODS: We carried out surgical interventions in 78 children aged 7-12 years with chronic colostasis resistant to conservative treatment. All patients underwent clinical, laboratory and instrumental examination. All patients were divided into 3 groups depending on type of surgery: group I - colon resection followed by intraperitoneal colorectal anastomosis (28 patients), group II - open Rehbein procedure (29 patients), group III - laparoscopic Rehbein procedure (21 patients). RESULTS: Absence of dyspeptic disorders and enterocolitis in remote postoperative period in patients receiving comprehensive treatment enhanced with new additions is the cause of improved outcomes. Type of surgery should be individualized in view of anatomical colon changes and secondary pathological conditions. Some pathological symptoms observed at preoperative period may be recurrent in long-term postoperative period due to wrong selection of surgery. The risk of recurrent chronic constipation is high after colon resection followed by intraperitoneal colorectal anastomosis. CONCLUSION: Rehbein procedure may be preferred for management of secondary megarectum and megasigma. Laparoscopic technique reduces surgical trauma and requires less postoperative analgesia.

The correlation between diverticulosis and redundant colon.

BACKGROUND: Diverticulosis and redundant colon are colonic conditions for which underlying pathophysiology, management and prevention are poorly understood. Historical papers suggest an inverse relationship between these two conditions. However, no further attempt has been made to validate this relationship. This study set out to assess the correlation between diverticulosis and colonic redundancy. METHODS: Redundant colon, diverticulosis and patient demographics were recorded during colonoscopy. Multivariate binary logistic regression was performed with redundant colon as the dependent variable and age, gender and diverticulosis as independent variables. Nagelkerke R 2 and a receiver operator curve were calculated to assess goodness of fit and internally validate the multivariate model. RESULTS: Redundant colon and diverticulosis were diagnosed in 31 and 113 patients, respectively. The probability of redundant colon was increased by female gender odds ratio (OR) 8.4 (95% CI 2.7-26, p = 0.00020) and increasing age OR 1.7 (95% CI 1.1-2.6, p = 0.017). Paradoxically, diverticulosis strongly reduced the probability of redundant colon with OR of 0.12 (95% CI 0.42-0.32, p = 0.000039). The Nagelkerke R 2 for the multivariate model was 0.29 and the area under the curve at ROC analysis was 0.81 (95% CI 0.73-0.90 p-value 3.1 × 10-8). CONCLUSIONS: This study found an inverse correlation between redundant colon and diverticulosis, supporting the historical suggestion that the two conditions rarely occur concurrently. The underlying principle for this relationship remains to be found. However, it may contribute to the understanding of the aetiology and pathophysiology of these colonic conditions.

Dolicomegacolon chagásico / Chagasic dolicho-megacolon

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