cerebral hernia

hernia /her·nia/ (her´ne-ah) [L.] protrusion of a portion of an organ or tissue through an abnormal opening.her´nial

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abdominal hernia  one through the abdominal wall, either a congenital defect or a complication of pregnancy or a surgical incision.

Barth hernia  one between the serosa of the abdominal wall and that of a persistent vitelline duct.

Béclard's hernia  femoral hernia at the saphenous opening.

Bochdalek hernia  congenital diaphragmatic hernia through the pleuroperitoneal hiatus.

cerebral hernia  protrusion of brain substance through the cranium.

Cloquet's hernia  pectineal h.

complete hernia  one in which the sac and its contents have passed through the hernial orifice.

congenital diaphragmatic hernia  one due to failure of a foramen in the fetal diaphragm to close when the infant is born; abdominal viscera in the thoracic cavity may cause fatal respiratory failure.

diaphragmatic hernia  hernia through the diaphragm.

diverticular hernia  protrusion of a congenital diverticulum of the intestine.

epigastric hernia  a hernia through the linea alba above the navel.

extrasaccular hernia  sliding h.

fat hernia  hernial protrusion of peritoneal fat through the abdominal wall.

femoral hernia  protrusion of a loop of intestine into the femoral canal.

gastroesophageal hernia  paraesophageal h.

Hesselbach's hernia  femoral hernia with a pouch through the cribriform fascia.

hiatal hernia , hiatus hernia protrusion of any structure through the esophageal hiatus of the diaphragm.

Holthouse's hernia  an inguinal hernia that has turned outward into the groin.

incarcerated hernia  a hernia so occluded that it cannot be returned by manipulation; it may or may not be strangulated.

incisional hernia  one through an old abdominal incision.

inguinal hernia  hernia into the inguinal canal.

intermuscular hernia , interparietal hernia an interstitial hernia lying between one or another of the fascial or muscular planes of the abdomen.

interstitial hernia  one in which a knuckle of intestine lies between two layers of the abdominal wall.

intra-abdominal hernia  congenital malpositioning of the intestine within the abdomen, with a portion of it protruding through a defect in the peritoneum or being trapped in a sac of peritoneum.

ischiatic hernia  sciatic h.

labial hernia  one into a labium majus.

mesocolic hernia  paraduodenal h.

obturator hernia  one protruding through the obturator foramen.

omental hernia  an abdominal hernia containing omentum.

ovarian hernia  hernial protrusion of an ovary.

paraduodenal hernia  an intra-abdominal hernia in which the small intestine rotates incompletely during development and becomes trapped in the mesentery of the colon.

paraesophageal hernia  hiatal hernia in which the esophagogastric junction is in place and a small or large part of the stomach protrudes into the thorax.

pectineal hernia  a femoral hernia that enters the femoral canal and then perforates the aponeurosis of the pectineus muscle.

perineal hernia  herniation of intestine into the perineum through a fissure in the levator muscle and its fascia.

preperitoneal hernia , properitoneal hernia an interstitial hernia lying between the parietal peritoneum and the transverse fascia.

reducible hernia  one that can be returned by manipulation.

retrograde hernia  herniation of two loops of intestine, with the part between them being within the abdominal wall.

Richter's hernia  incarcerated or strangulated hernia in which only part of the circumference of the bowel wall is involved.

sciatic hernia  herniation of intestine through the greater or lesser sciatic foramen.

scrotal hernia  inguinal hernia that has passed into the scrotum.

sliding hernia  hernia of the cecum (on the right) or the sigmoid colon (on the left) in which the intestinal wall forms part of the hernial sac and the rest of the sac is formed by parietal peritoneum.

sliding hiatal hernia  hiatal hernia with the upper stomach and the esophagogastric junction protruding into the posterior mediastinum; the protrusion may be fixed or intermittent and is partially covered by a peritoneal sac.

strangulated hernia  incarcerated hernia so tightly constricted as to compromise the blood supply of the hernial sac, leading to gangrene of the sac and its contents.

synovial hernia  protrusion of the inner lining membrane through the fibrous membrane of an articular capsule.

umbilical hernia  an abdominal hernia with intestine inside the umbilicus and the body wall defect and protruding intestine covered by skin and subcutaneous tissue.

hernia u´teri inguina´lis  see persistent müllerian duct syndrome, under syndrome.

vaginal hernia  vaginocele; a hernia into the vagina.

ventral hernia  abdominal h.

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cerebral hernia

n.

Protrusion of brain substance through a defect in the skull.

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cerebral hernia.

See cephalocele.

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hernia

the abnormal protrusion of part of an organ or tissue through the structures normally containing it.

In this condition, a weak spot or other abnormal opening in a body wall permits part of the organ to bulge through. A hernia may develop in various parts of the body; most commonly in the region of the abdomen.

A layman's term for hernia is rupture. A hernia is either acquired or congenital.

Anatomically specific hernias are listed under their individual sites.

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caudal abdominal h's

see inguinal, femoral, scrotal hernias (below).

cerebral hernia

see brain herniation.

cord hernia

a type of umbilical hernia in which the midgut has failed to return to the abdominal cavity during fetal development and remains within the umbilical cord.

crural hernia

femoral hernia.

external hernia

protrusion of abdominal contents through an opening in the abdominal wall.

false hernia

a structural defect with contents but without a peritoneal sac.

fat hernia

hernial protrusion of peritoneal fat through the abdominal wall or through the vulvar wall during a difficult calving.

incarcerated hernia

hernia so occluded that it cannot be returned by manipulation; it may or may not become strangulated.

incisional hernia

hernia after operation at the site of the surgical incision, owing to improper healing or to excessive strain on the healing tissue; such strain may be caused by excessive muscular effort, activity, or by obesity, which creates additional pressure on the weakened area.

inguinoscrotal hernia

see scrotal hernia (below).

irreducible hernia

incarcerated hernia.

mesenteric hernia

hernia of a loop of small intestine through a traumatic tear in the mesentery.

muscle hernia

the belly of the muscle protrudes through a tear in the fascia and epimysium.

paraesophageal hernia

hiatal hernia in which part or almost all of the stomach protrudes through the hiatus into the thorax to the left of the esophagus, with the gastroesophageal junction remaining in place.

pelvic hernia

hernia caused by a loop of intestine becoming incarcerated in a hiatus between the wall of the pelvis and the ductus deferens, caused by tearing of the fold of the ductus at castration. May occur many months after the castration operation. Can be resolved, if diagnosed early enough, by traction on the taut mesentery per rectum.

pericardial hernia

see peritoneopericardial hernia.

perineal hernia

see perineal hernia.

pleuroperitoneal hernia

see diaphragmatic hernia.

prepubic hernia

the result of avulsion of the cranial pubic tendon.

reducible hernia

one that can be returned by manipulation.

scrotal hernia

inguinal hernia which has passed into the scrotum. When these become strangulated they cause severe abdominal pain and acute local swelling. In large animals the tightened spermatic cord can be felt disappearing into the inguinal canal. See also intestinal obstruction.

Scrotal hernia in a horse. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003

sliding hiatal hernia

hiatal hernia in which the stomach and the cardioesophageal junction protrude into the caudal mediastinum; the protrusion, which may be fixed or intermittent, is partially covered by a peritoneal sac.

slip hernia, slipped hernia

sliding hernia.

strangulated hernia

one that is tightly constricted. As any hernia progresses and bulges out through the weak point in its containing wall, the opening in the wall tends to close behind it, forming a narrow neck. If this neck is pinched tight enough to cut off the venous return, the hernia will quickly swell and become strangulated. This is a very dangerous condition that can appear suddenly and requires immediate surgical attention. Unless the blood supply is restored promptly, gangrene can set in and may cause death.

traumatic hernia

protrusion of abdominal viscera into a subcutaneous site because of traumatic injury to the abdominal muscles.

uterine hernia

a gravid uterus can prolapse through an inguinal hernia in dogs and cats.

vaginal hernia

hernia into the vagina; called also colpocele.

ventral hernia

trauma with tearing of the body wall results in prolapse of abdominal contents into the subcutaneous tissue. Also reported in ewes from violent straining during parturition.