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Query: UMLS:C0851184 (thinning)
 11,252 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

It has been suggested that diverticulosis is the result of uncoordinated muscle activity of the colon in response to normal physiologic stimuli such as eating, emotions and the urge to defecate. This results in spasm of the longitudinal muscle with the heaping up of circular muscle bundles, creating interhaustral folds along the colonic wall adjacent to the mesentery. Narrowing of the lumen and shortening of the colon results which is enhanced by a low residue diet and prevented by a bulky diet. Segmentation results when muscular contraction approximates these interhaustral folds. Higher intraluminal pressure is produced in the areas of segmentation which enhances the development of diverticulosis in the bowel between interhaustral folds where there is a thinning of the circular muscles and where vessels pierce the colonic wall. The case presented herein supports these hypothesis in that the patient has experienced the extreme in a low residue diet for 50 years.
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PMID:Diverticulosis in an unused colon. 113 Mar 93

Two clinico-morphological forms of colon diverticulosis are distinguished on the basis of post-mortem and surgical material (89 observations) studied histologically, neurohistologically and electron-microscopically. The first form is characterized by the disturbance of colon peristalsis, inflammation, segmentation of the colon wall and the presence of staged changes in the colon wall muscles. Disturbances of the vegetative innervation and regional hemodynamic disturbances play a role in the patho- and morphogenesis. The second form develops in aged persons and is characterized by weakness of the colon wall with thinning of the muscle layer. In both forms atrophy of the circular muscle layer develops with dilation of perivascular spaces and formation of "weak sites" in the colonic wall.
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PMID:[Pathomorphology of colonic diverticulosis]. 809 37

Obstructive colitis is an ulcero-inflammatory and necrotizing condition that occurs in the colon proximal to benign or malignant stenosing lesions. it is the result of ischemia due to impairment of blood supply secondary to elevation of the endoluminal pressure, distension of the colonic wall and other factors which impair adequate perfusion. The incidence among patients with colonic obstruction is reported at between 1 and 7%. Of 50 patients with this condition in this series, 30 female and 20 male, 2/3rds were well over 70 yrs of age. Obstruction was most common in the rectosigmoid. In half the patients this was due to adenocarcinoma, 24 were due to benign obstruction and 15 were caused by diverticular disease. Type, extent and depth of ischemic lesions were highly variable and comprised early mucosal hemorrhage and edema, ulcero-hemorrhagic lesions and transmural necrosis. There was always an abrupt transition between affected and normal bowel. A segment of preserved mucosa was usually present on the proximal side of the stenosis. In 16 patients massive dilatation with stretching and thinning of the bowel wall, associated with a blow-out type of perforation or with transmural necrosis, was observed and was considered to have resulted from a rapid rise of endoluminal pressure to high levels. The microscopic and macroscopic features are described in detail and histological factors discussed in relation to the pathological lesions encountered. Emphasis is placed upon the range of appearances and similarities are shared with other inflammatory colonic diseases, particularly idiopathic inflammatory bowel disease. The importance of recognition of this disease entity, not only by pathologists but by surgeons dealing with the disease at operation, is stressed.
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PMID:Obstructive colitis: an analysis of 50 cases and a review of the literature. 877 Nov 49

Tracheal diverticulum is a rare benign entity. Tracheobronchomegaly (TBM), also known as Mounier-Kuhn syndrome, is a rare disorder characterized by marked dilation of the trachea and main bronchi, associated with thinning or atrophy of the elastic tissue. Because of the weakened trachea and increased intraluminal pressure related to chronic cough, some patients may develop mucosal herniation leading to tracheal diverticulosis. We report the case of a patient with TBM with a huge tracheal diverticulum, diagnosed by bronchoscopy and computed tomography with three-dimensional reconstruction. to our knowledge this is the largest tracheal diameter described in a patient affected by this syndrome.
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PMID:Huge Tracheal Diverticulum in a Patient with Mounier-Kuhn Syndrome. 3075 80

Mounier-Kuhn syndrome (MKS) is a rare congenital disease with an autosomal recessive inheritance pattern, characterized by an enlargement of the trachea and bronchi. MKS is secondary to a thinning of the muscular mucosa and atrophy of the longitudinal muscle and elastic fibers of the tracheobronchial tree. As a consequence, tracheal diverticulosis and dilatations in the posterior membranous wall appear, along with bronchiectasis that tend to be cystic in appearance. Overall, there is an impairment of mucocilliary clearance, with an ineffective cough, which predisposes the patient to recurrent lower respiratory tract infections. Clinical manifestations vary from asymptomatic to respiratory failure and death, most patients being diagnosed between the third and fourth decades of life. It is an often undiagnosed disease, with a diagnostic algorithm that includes the use of radiological techniques, alone or in combination with bronchoscopy. Specific diagnostic criteria have been developed, based on patients' tracheal and main bronchi diameter on chest X-ray and thoracic computed tomography scan. We present the case of a 45-year-old African American man who presented with a history of multiples episodes of pneumonia that required management in the intensive care unit, on whom MKS was diagnosed.
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PMID:Thoracic Computed Tomography Scan and Bronchoscopy Appearance of Mounier-Kuhn Syndrome: A Case Report. 3277 89