Missed Isolated Transverse Colon Injury Following Trauma at a Tertiary Hospital in Nigeria

Missed Isolated Transverse Colon Injury Following Trauma at a Tertiary Hospital in Nigeria . Bowel injuries are not a common presentation following blunt abdominal trauma and delayed diagnosis is still a major predictor of outcome in the management of poly traumatized patients. Reasons are not unrelated to Patients level of consciousness, presence of other distracting injuries and most frequently physician related factors as regards clinical assessment and judgement. Furthermore, improvements in diagnostic techniques and improved clinical competence may lead to a decreased incidence of missed injuries amongst practitioners. We report an unusual case of isolated transverse colon injury following a blunt abdominal trauma in a Nigerian woman six weeks post trauma. pouch, right paracolic gutter and the pelvis with bowel loops seen floating within the fluid. The visualized bowel loops are normal in calibre but shows reduced peristalsis. The liver, span was 15.4 cm with normal echo texture and outline. The spleen was 12.1cm, normal size and echo texture. Kidneys, uterus, urinary bladder and adnexa were normal in echogenicity. Plain abdominal X-ray done showed multiple air fluid levels. A diagnosis of generalized peritonitis secondary to perforated peptic ulcer disease was made thereafter. She was resuscitated and worked up for exploratory laparotomy. Intra operative findings were extensive intra peritoneal adhesions, a 4 x 3cm perforation with ragged edges at the mid posterior portion of the transverse colon and 1.5L purulent intra peritoneal fluid. She had a transverse loop colostomy from the perforated transverse colon and peritoneal lavage. In the immediate post operative period she developed tachypnea (>40/ min) and tachycardia (>120/min). She was managed for about 48 hours in the intensive care unit wherein she had thoracentesis done in the left hemi thorax which yielded 150mls of serosanguinous fluid. oral after the colostomy Check X-ray of the pelvis at 8th week bed rest


Introduction
Missed injuries have been defined by several authors some have used how clinically significant the missed injuries are [1,2] while others have used the length of time from injury to diagnosis [1,3]. Missed injuries therefore are injuries associated with high morbidity and mortality as a result of a delayed diagnosis 1, 2 or the requirement of further surgical procedures as criteria to define clinically significant missed injuries [4]. Penetrating abdominal injuries are the commonest cause of colonic injury, however it is a rare presentation in blunt abdominal trauma [5]. Hollow viscous injuries such as the bowels account for 17.8% of all missed injuries in blunt abdominal trauma in comparison to solid organs such as the spleen (8.9%) and liver (3.3%); as such, a hollow viscous injury is the most frequently missed organ injury [6]. The accurate diagnosis of blunt gastrointestinal tract injuries is therefore very pertinent. Early diagnosis is a sine qua non in achieving a favorable outcome. We report an unusual case of isolated transverse colon injury that was missed six weeks post trauma in a Nigerian woman and reviewed relevant literatures.

Case presentation
A.O was a 20-year-old Nigerian female student who was admitted with a one hour history of inability to bear weight on the lower limbs following a Pedestrian-Motor vehicular accident. There were associated transient loss of consciousness and injury to the lower limbs. However, there was no history of seizure or bleeding from cranio-facial orifices. Initial care was at a peripheral hospital before she was referred to our facility. There is no history of intercurrent medical illness. She does not smoke cigarette nor take alcohol. She is the first of six children in a monogamous family. At

Discussion
Trauma is emerging as a leading cause of death and significant morbidity world over, with developing country like ours not excluded. This has been attributed to increase technological activity especially with the development of high-speed automobiles; in addition to this, the poor states of our roads often contribute to this menace [7,8]. and stomach (19.3%) [11]. However, in blunt abdominal injury solid organ such as the spleen (74%) is the commonest injured organ [12]. The scenario in our patient was an isolated transverse colon injury following a blunt trauma which is skewed away from the usual presentation.
Patients who have been severely injured in road accidents, especially those with head injury, and a greater Injury Severity Score, are more likely to have missed injuries [1,3,9]. However, a high index of suspicion should be made when assessing trauma patients irrespective of the severity to avoid missed injury as was observed in our patient. Some investigators report missed injuries in multiple trauma patients; 2 other authors describe unrecognized injuries in patients with abdominal [13] and orthopedic trauma [14]. Our patient presented with a mild head injury and pelvic injury with no clinical feature of abdominal injury at presentation, but this gradually evolved to generalized peritonitis six weeks post trauma. A possible relationship between delay of diagnoses and morbidity was reported in a study by Vles et al. [3] Some studies have reported high rates of mortality 1, 10, and 13 among trauma patients with missed injuries. The anatomical location of the injury has correlation with morbidity and mortality. For hollow viscous injuries following blunt abdominal trauma, gastric injuries have a higher mortality rate compared to 15.2% for small bowel injuries and 19.4% for colon and rectal injuries [15].  [16]. Similarly, Ameh et al did a retrospective study of children aged 12 years or less managed for ano rectal injury over a 10-year period. Out of the seven children studied, an intra rectal injury was missed at initial assessment in one female who eventually died of peritonitis from a missed intra rectal injury [17]. At present, the management of blunt abdominal trauma especially in children was preferably non-operative but with increased likelihood of missed gastrointestinal tract injury [18]. Since obvious features may not be to have a combination of contributing factors [9,21]. Janjua et al [9] also found that in 50% of cases, more than one factor was responsible for the occurrence of missed injury. To reduce the rate of missed injuries, we must focus wholly on patient when evaluating them whether as a major or minor case. Furthermore, some authors emphasized the role of tertiary trauma survey in patients with multiple injuries, as significant injuries may be missed during the primary and secondary surveys [3,9,10]. Over fifty percent of overall missed injuries and ninety percent of clinically significant missed injuries were diagnosed by tertiary trauma survey within 24 hours of admission [3,9]. The onus, therefore, lies on us clinicians to be diligent, seek for knowledge when necessary and imply a patient centered practice which will help in curbing this medical dilemma.

Conclusion
Isolated traumatic transverse colon injury complicating missed blunt abdominal injury is an unusual presentation in clinical practice. Timely identification and in-depth clinical evaluation are key to early diagnosis and hence obviate the associated morbidity and mortality. Missed injuries still occur at an unacceptably high rate in trauma patients. The onus therefore, lies on us clinicians to be diligent when evaluating them especially the tertiary survey, seek for knowledge when necessary and imploy a patient centred practice which will help in curbing this medical enigma and improve patient outcome.