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Caudal regression sequence

MedGen UID:
81254
Concept ID:
C0300948
Congenital Abnormality
Synonyms: Caudal dysgenesis syndrome; Caudal dysplasia; Caudal regression syndrome
SNOMED CT: Caudal dysplasia sequence (8301004); Caudal regression syndrome (8301004)
Modes of inheritance:
Non-Mendelian inheritance
MedGen UID:
109109
Concept ID:
C0600599
Genetic Function
Source: Orphanet
A mode of inheritance that depends on genetic determinants in more than one gene.
Not genetically inherited
MedGen UID:
988794
Concept ID:
CN307044
Finding
Source: Orphanet
clinical entity without genetic inheritance.
 
Monarch Initiative: MONDO:0017607
OMIM®: 600145; 610132
Orphanet: ORPHA3027

Definition

Caudal regression syndrome is a disorder that impacts the development of the lower (caudal) part of the spine. The condition can affect many parts of the lower body, including the lower back and limbs, the genitourinary tract, and the gastrointestinal tract.

In people with this disorder, the bones of the lower spine (vertebrae) are misshapen or missing. The end of the spinal cord, the bundle of nerves and cells protected by the vertebrae, may also be malformed or missing. Sometimes, the spinal cord is abnormally connected (tethered) to nearby tissues. People with caudal regression syndrome can also have an abnormal curvature of the spine (lordosis or kyphosis). The spinal abnormalities may affect the size and shape of the chest, which very rarely leads to breathing problems.

Individuals with caudal regression syndrome may have small hip bones. The buttocks tend to be flat and dimpled. The bones of the legs are typically underdeveloped, and the joints in the lower limbs may be unusually stiff and difficult to move. In some affected individuals, the legs are bent with the knees pointing out to the side and the feet tucked underneath the hips (sometimes called a frog leg-like position). These individuals may have webbed skin behind their knees. In other affected individuals, the knees may not bend, and the legs remain in a straight position. Their feet may be inward- and upward-turning (clubfeet) or outward- and upward-turning (calcaneovalgus). Some people with caudal regression syndrome have reduced or excessive sensation in their lower limbs. Sensitivity differs from person to person and from one area of the limb to another.

Mobility in people with caudal regression syndrome is varied. Some individuals with the condition walk independently, and others require mobility aids, such as braces, crutches, walkers, or wheelchairs.

Abnormalities in the genitourinary tract in people with caudal regression syndrome are diverse. Urinary tract problems can result from abnormalities in the lowest part of the spinal cord, which contains the nerves that control bladder function. Damage to these nerves can cause a condition called neurogenic bladder, which makes it difficult to control the flow of urine. In addition, the kidneys may be malformed in people with caudal regression syndrome; defects include a missing kidney (unilateral renal agenesis), kidneys that are fused together (horseshoe kidney), or duplication of the tubes that carry urine from each kidney to the bladder (ureteral duplication). These kidney abnormalities and neurogenic bladder can lead to frequent urinary tract infections and the backflow (reflux) of urine into the kidneys, which damage the kidneys and can cause progressive kidney failure.

Genital abnormalities in people with caudal regression syndrome can include the urethra opening on the underside of the penis (hypospadias) or undescended testes (cryptorchidism). Some affected people may have an abnormal connection between the rectum and vagina (rectovaginal fistula). In severe cases, people with this condition may have underdeveloped genitalia (genital agenesis).

People with caudal regression syndrome may have abnormal twisting (malrotation) of the large intestine, an obstruction of the anal opening (imperforate anus), soft out-pouchings in the lower abdomen (inguinal hernias), or other malformations of the gastrointestinal tract. Affected individuals are often constipated and may have difficulty with bowel control.

 

The upper part of the body can also be affected. Some people with caudal regression syndrome have a heart condition or hearing problems. [from MedlinePlus Genetics]

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVCaudal regression sequence

Recent clinical studies

Etiology

Taylor RAM, Mackie A, Mogra R, Pinner J, Rajendran S, Ross GP
Diabet Med 2019 Feb;36(2):252-255. doi: 10.1111/dme.13844. PMID: 30362177
Garne E, Loane M, Dolk H, Barisic I, Addor MC, Arriola L, Bakker M, Calzolari E, Matias Dias C, Doray B, Gatt M, Melve KK, Nelen V, O'Mahony M, Pierini A, Randrianaivo-Ranjatoelina H, Rankin J, Rissmann A, Tucker D, Verellun-Dumoulin C, Wiesel A
Birth Defects Res A Clin Mol Teratol 2012 Mar;94(3):134-40. Epub 2012 Feb 28 doi: 10.1002/bdra.22886. PMID: 22371321
Van Allen MI, Myhre S
Am J Med Genet 1991 Mar 15;38(4):523-8. doi: 10.1002/ajmg.1320380404. PMID: 2063890

Diagnosis

Taylor RAM, Mackie A, Mogra R, Pinner J, Rajendran S, Ross GP
Diabet Med 2019 Feb;36(2):252-255. doi: 10.1111/dme.13844. PMID: 30362177
Hentschel J, Stierkorb E, Schneider G, Goedde S, Siemer S, Gortner L
J Perinatol 2006 Jul;26(7):445-7. doi: 10.1038/sj.jp.7211534. PMID: 16801960
McMahon CJ, DiBardino DJ, Undar A, Fraser CD Jr
Ann Thorac Surg 2002 Sep;74(3):919-21. doi: 10.1016/s0003-4975(02)03794-3. PMID: 12238867
Depraetere M, Dehauwere R, Mariën P, Fryns JP
Genet Couns 1995;6(4):303-7. PMID: 8775416
Van Allen MI, Myhre S
Am J Med Genet 1991 Mar 15;38(4):523-8. doi: 10.1002/ajmg.1320380404. PMID: 2063890

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