Lumbar hernia: An unusual abdominal hernia: A case report and review of literature (radiological perspective) in a tertiary center in south-south Nigeria

Lumbar hernias are unusual abdominal wall defects involving the posterolateral abdominal wall: the superior lumbar triangle of Grynfelt, which is the most common site, and the inferior lumbar triangle of Petit. They are located between the muscular layers of the abdominal wall and can be easily ignored because of abdominal obesity. In general, it is difficult to diagnose because of their unclear non-specific symptoms. However, radiographic studies have been valuable in confirming the diagnosis.
The introduction of ultrasonography and computed tomography (CT) has greatly improved the diagnosis of lumbar hernia. Following the establishment of the diagnosis, operative management is indicated due to chance of incarceration.
Our case study is an 80 years old man who presented to the Radiology department for an emergency abdominal ultrasound scan investigation on account of abdominal pain/abdominal swelling on the lateral aspect of the right flank of about 5 days as explained by his relative. The abdominal ultrasound shows a hyperechoic mass in the right flank that extends through a defect in the transversus abdominis muscle. This mass measures 5.3x4.9cm and shows no flow on Doppler interrogation. Note mild fluid collection seen surrounding the mass. Also note marked subcutaneous oedema. Another imaging modality was employed; non contrast computed tomography and shows a lateral abdominal wall defect in the right lower internal oblique with sac containing bowel loop and omental fat. Other visualized bowel loops are normal in caliber and wall thickness.