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Microvillous Inclusion Disease (MVID) is one of the congenital diarrheal disorders (CDD) caused by genetic defects in enterocyte differentiation and polarization. Its prevalence is higher in countries with a high degree of consanguinity. It causes severe, intractable secretory diarrhea leading to permanent and definitive intestinal failure with resultant dependency on parenteral nutrition (PN). Small bowel transplantation is the only curative treatment. The gold standard for diagnosis are the typical morphological abnormalities in small bowel biopsies on light and electron microscopy (EM). In recent times, histochemistry and immunohistochemistry have shown sufficient diagnostic accuracy replacing EM if the facility is unavailable or EM findings are inconclusive. We describe a neonate with CDD who was diagnosed to have MVID on the duodenal biopsy by morphohistochemical and immunophenotypic methods used for the first time in Oman. By utilizing such easy and accessible diagnostic methods, a rare genetic disorder could be diagnosed with certainty and the family could be counseled accordingly. With a high degree of consanguinity in the region, the prevalence of MVID in Oman needs to be identified once these patients are diagnosed by utilizing appropriate investigations. Care of such patients necessitates improving current parenteral nutrition services and addressing the future need for small bowel transplantation (SBTx), in Oman.

Diagnosis of Microvillous Inclusion Disease: A Case Report and Literature Review with Significance for Oman