Lymphoid nodular hyperplasia

What it means

Lymphoid nodular hyperplasia (LNH) of the terminal ileum and colon has been considered a mucosal response to nonspecific stimuli, most often infections, and consequently has been regarded as a pathophysiologic phenomenon during infancy and childhood. LNH can be ascertained by colonoscopy, whereby a lymphoid nodule is defined as an extruding follicle with a diameter of not more than 2 mm, and LNH is defined as a cluster of not more than 10 of such extruding lymphoid nodules (see Figure 1 of PMID:17368236).

The presence of LNH in the mucosa of the colon and/or terminal ileum is a frequent finding (30%) in children undergoing colonoscopy. Unless associated with other endoscopic lesions, LNH is mostly related to a condition of delayed-type food hypersensitivity and affects mainly preschool or school-age children with hematochezia.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Lymphonodular hyperplasia of the colon