Background:Hydrometrocolpos (HMC) is a clinical condition in which there is a cystic distension of the vagina (hydrocolpos), uterus and sometimes, fallopian tubes (hydrosalpinx) with fluid. This study described our experience with cases of HMC seen in our practice, and highlighted the flare in our practice.Patients and Methods:A retrospective study of cases of HMC managed at the University of Port Harcourt Teaching Hospital between September 2010 and August 2012.Results:There were seven cases; their ages ranged from 2 to 27 days (median 13 days). All the patients had abdominal distension but abdominal mass was obvious only in four. Other features varied depending on the presence of sepsis or other associated anomalies. The diagnosis of HMC was missed in all cases by the referring clinicians. One patient was referred with the diagnosis of tracheoesophageal fistula and esophageal atresia, 2 with bladder outlet obstruction, 1 with intestinal obstruction, 2 with anorectal malformation, and 1 with neonatal sepsis. Ultrasound identified bulky uterus in two cases and upper urinary tract dilatation in 3 patients. Six patients had laparotomy, 1 had hymenotomy only. Postoperative complications were basically wound sepsis and rectovaginal fistula resulted.Conclusion:Diagnosis of HMC should be considered as a differential in newborn girls presenting with lower abdominal mass. Attention to clinical detail is necessary to avoid a misdiagnosis.