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Syndrome reference sheet
Generated 12 Oct 2026
Urology · Urology / Pediatric urology

Megacystis-microcolon-intestinal hypoperistalsis syndrome

Also known as: MMIHS

Congenital bladder distension with intestinal dysmotility.

Medical specialty
Urology
Subspecialty
Urology / Pediatric urology
Sex & age distribution
Male: affected; Female: affected, female predominance; Children: yes, neonatal
Gene(s) involved
ACTG2, LMOD1, MYH11, MYLK

Etiology & mechanism

Visceral smooth muscle failure.

Gene(s) involved (4)

ACTG2LMOD1MYH11MYLK

Symptoms & signs (5)

hydronephrosisintestinal hypoperistalsismegacystismicrocolonvomiting
SyndromeScope — educational reference. Content is model-generated and not clinically verified; always confirm against OMIM, Orphanet and GeneReviews before clinical use.