Only 0.12% to 2% of diagnosed hernias are Spigelian type. Even less frequently encountered—Grynfeltt-Lesshaft hernias—hernias have unknown incidence. A Spigelian hernia is encountered along the Spigelian fascia and Grynfeltt-Lesshaft hernias are bounded by the superior lumbar triangle. These unique hernias can both be intermuscular, given their anatomical borders which allow concealment and preclusion of accurate diagnosis. Here, an 86-year-old male presented with symptoms consistent with small bowel obstruction. On physical exam, a right lower quadrant hernia and right posterior flank mass were appreciated. Computed tomography revealed obstruction secondary to bowel incarceration within Spigelian hernia and additional Grynfeltt-Lesshaft hernia. The patient underwent reduction and repair of Spigelian hernia with synthetic mesh, while repair of asymptomatic hernia was deferred. These unusual hernias are difficult to distinguish, given their negligible occurrence and unreliable exam findings. Clinicians must remain cognizant of their features to aid in diagnosis and mitigate potential sequelae.
Inferior lumbar triangle
