Definition

Noun: A Meckel's diverticulum is a congenital (present from birth) pouch or sac (diverticulum) that forms in the wall of the small intestine, specifically in the ileum. It is a remnant of the omphalomesenteric duct (also called the vitelline duct or yolk stalk), a structure that connects the developing fetus to the yolk sac. This condition occurs when this duct does not close completely before birth.

Usage

This term is used exclusively in medical and anatomical contexts to describe this specific congenital anomaly. - It is a proper noun, often capitalized ("Meckel's"). - It is typically used with definitive articles ("the," "a") or possessive forms ("patient's").

Examples

• Noun:
  • The surgeon discovered an inflamed Meckel's diverticulum during the appendectomy.
  • Gastrointestinal bleeding in a young child can sometimes be caused by a Meckel's diverticulum.
  • The presence of a Meckel's diverticulum is often asymptomatic but can lead to complications.

Advanced Usage

• "Symptomatic Meckel's diverticulum": Refers to a diverticulum that is causing clinical problems, such as bleeding, obstruction, or inflammation (diverticulitis).

  • The child was admitted for surgery due to a symptomatic Meckel's diverticulum causing intestinal obstruction.

• "Meckel's scan" or "Technetium-99m pertechnetate scan": A diagnostic nuclear medicine test specifically used to detect the presence of gastric mucosa within a Meckel's diverticulum.

  • The pediatrician ordered a Meckel's scan to investigate the source of the pain.

Variants and Related Words

• Diverticulum (n): A general term for a small pouch or sac forming in the wall of a hollow organ, such as the intestine.
• Ileal diverticulum (n): A more general anatomical term that may refer to Meckel's diverticulum or other pouches in the ileum.
• Omphalomesenteric duct remnant (n): The formal embryological term for the structure that, when persistent, becomes a Meckel's diverticulum.

Synonyms

• Meckel diverticulum (alternative spelling without the apostrophe 's').
• Vitelline duct remnant.

Related Phrases

• Rule of twos: A common mnemonic in medicine describing Meckel's diverticulum: it occurs in about 2% of the population, is usually located about 2 feet from the ileocecal valve, is often about 2 inches long, and can contain two types of ectopic tissue (gastric or pancreatic).
  • The rule of twos is a helpful way to remember the classic features of Meckel's diverticulum.

Notes

This is a highly specialized medical term. There are no idioms or phrasal verbs associated with it. Its understanding is based entirely on anatomical and clinical knowledge.

Noun

1. a congenital diverticulum in the ileum resulting from incomplete closure of the yolk sac