Abstract
Characterisation of histopathology is often considered the gold standard investigation for disorders of enteric neuromuscular function, but remains a challenge given limitations in available expertise, tissue and tools. Furthermore, changes in the tissue are often subtle and may be patchy. Optimal histopathological characterisation requires appropriate preparation of adequate samples of tissue before application of a range of immunostaining techniques. Over the years this has led to the identification of a number of discrete histopathological patterns of enteric neuromuscular disease classed under the headings of enteric neuropathies, myopathies, mesenchymopathies and channelopathies. In terms of congenital disorders each of these groups comprises both quantitative and qualitative abnormalities. For neuropathies these range from aganglionosis as seen in Hirschsprung’s disease through to neuronal immaturity and degeneration. Myopathies include defects of muscle layering, replacement of muscle by fibrosis, myocyte vacuolation and atrophy, and abnormalities in contractile proteins. Acquired disorders largely comprise immune mediated disruption of enteric nerves and muscles with evidence of immunocyte infiltration and in some cases cell loss. Systemic disorders resulting in enteric neuromuscular function include cystic fibrosis and mitochondrial cytopathies each of which are associated with specific histological phenotypes. In the future it is likely histological characterisation will improve further but need to follow more robust, widely applicable protocols incorporating a broader range of specialised methodologies and assessment of other cell types including glia and interstitial cells of cajal.
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Smith, V.V. (2013). Pathology of Enteric Neuromusculature. In: Faure, C., Di Lorenzo, C., Thapar, N. (eds) Pediatric Neurogastroenterology. Clinical Gastroenterology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-709-9_17
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