Megacolon diagnosis in pregnancy: A case report and literature review

Megacolon is a rare clinical condition consisting of an abnormally dilated colon in the absence of mechanical obstruction. Megacolon can complicate pregnancy in terms of maternal morbidity and mortality (volvulus, ileus, systemic toxicity, bowel perforation, sepsis) and obstetrical outcomes (preterm birth, premature rupture of membranes, dystocia). Pregnancy, on the other hand, can exacerbate chronic constipation through hormonal and mechanical mechanisms. A case of megacolon, first detected during pregnancy in an otherwise healthy nulliparous woman, is reported. The diagnosis was suspected on observation of a pelvic mass of unknown aetiology (mean diameter > 10 cm) constricting and dislocating the gravid uterus contralaterally during a routine mid-trimester fetal ultrasound. The diagnostic work-up and management are discussed. Chronic constipation in women of reproductive age should receive greater clinical attention during pre- and periconception care. A multi-disciplinary approach, timely diagnosis and delivery planning are fundamental to ensure favourable outcomes for both the mother and fetus when dealing with megacolon during pregnancy.