A Spigelian hernia is an acquired ventral hernia through
the linea semilunaris,
The patient presents with pain that is
localised to the hernial site and is aggravated by any movement that
raises intra-abdominal pressure. Later, the pain becomes more dull,
constant, and diffuse.
A soft, reducible mass may be present in the lower abdominal area
which disappears on pressure. When the mass is reduced, the hernial
orifice can usually be palpated. Diagnosis is more difficult when
the hernia dissects within the layers of the abdominal wall -
internal and external obliques - or may be located at a distance
from the linea semilunaris. Ultrasound and CT scan may help to
confirm the diagnosis.