Abstract
The Hirschsprung disease (HD) is a complex genetic congenital condition characterized by the absence of ganglion cells in the myenteric and submucosal plexuses of the colon and rectum, leading to functional intestinal obstruction. A study was conducted from July 2022 to December 2022. The Toluidine blue stain and calretinin immunohistochemistry were applied to 36 cases of neonates and infants who clinically presented with symptoms suspicious of having HD, And the hematological study of cell blood counts test and compared the result of the HD group with the non-HD group and control group. The study showed an increase in mast cell numbers in the rectal biopsy tissue of HD patients compared with non-HD patients using Toluidine blue stain. The Immunohistochemistry for calretinin result displayed 27 (75%) cases as HD, while the remaining 9 (25%) cases were confirmed as non-HD and showed hypertrophied nerve fiber in HD cases. at the same time, the complete blood count result was unrelated to HD. Some worrying maternal risk factors were highlighted during pregnancy were the age of the mother at conception, maternal illness, intake of drugs, type of Childbirth, and number of previous maternal abortions; all of them show a non-significant difference between the HD group and non-HD group, also consanguineous marriage was detected and shows a significant difference between the HD group and non-HD group. Keywords: Hirschsprung, Calretinin, Toluidine blue, CBC count
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