crypt hyperplasia
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The gut trying to repair itself — overproducing replacement cells in response to villi being destroyed faster than they can be replaced.
The crypts of Lieberkühn are gland-like pits nestled between villi in the intestinal lining. Their job is to continuously produce new enterocytes (absorptive cells) that migrate up the villus and replace worn-out ones — a normal turnover of every 2–5 days. In celiac disease, as villous damage accelerates, the crypts work overtime — enlarging and deepening (hyperplasia) in an attempt to produce cells fast enough to compensate.
What It Looks Like Under the Microscope
Crypt hyperplasia is one of the three histological features graded by the marsh-classification:
- Crypts become elongated — sometimes 2–3× their normal depth
- The crypt-to-villus ratio (normally ~1:3) inverts as villi shrink and crypts enlarge
- Increased mitotic activity visible in crypt cells (cells dividing rapidly)
It appears in Marsh stages 2, 3a, 3b, and 3c — meaning it accompanies the full range of villous damage but is absent in the earliest infiltrative stage (Marsh 1) where only IEL count is elevated.
Why It Matters
Crypt hyperplasia is a marker of disease activity, not an independent problem — it reflects the body's response to damage rather than causing damage itself. It reverses on a gluten-free-diet as inflammation resolves and villi regenerate.
Its presence alongside elevated IELs distinguishes celiac-related pathology from some other conditions that cause IEL elevation without crypt changes.
Related Concepts
villi | villous-atrophy | intraepithelial-lymphocytes | marsh-classification | enterocytes | gluten-free-diet