A 35-year-old woman is admitted to the hospital with a mass protruding through her skin at the right lower quadrant. Physical examination reveals intestinal herniation, as shown below. Which of the following is the most likely diagnosis?

A Spigelian hernia occurs along the semilunar line below the umbilical region and can protrude through the skin. A Richter hernia is a hernia that presents as a strangulated segment of part of the wall of an intestinal loop through any hernial opening. A paraumbilical hernia occurs at the level of the umbilicus, near the midline. An incisional hernia occurs with dehiscence (breakdown and reopening) of an operative incision after surgery. A ventral hernia is a type of incisional hernia located on the ventral surface of the abdomen, occurring only after surgery.