Familial caudal dysgenesis

Familial caudal dysgenesis, also known as familial caudal regression syndrome or familial sacral agenesis, is a rare congenital disorder characterized by abnormal development of the lower (caudal) end of the spine and spinal cord. In familial forms, the condition occurs in multiple members of a family, distinguishing it from the more commonly encountered sporadic caudal regression syndrome, which is frequently associated with maternal diabetes. The condition primarily affects the musculoskeletal, neurological, genitourinary, and gastrointestinal systems. Key clinical features include partial or complete absence of the sacrum and coccyx (sacral agenesis), with variable involvement of the lumbar vertebrae. Affected individuals may present with lower limb abnormalities ranging from mild weakness to more significant motor impairment, neurogenic bladder dysfunction, bowel incontinence, and renal anomalies. The severity of symptoms is highly variable, even within the same family. Some patients may have relatively mild sacral defects with preserved function, while others experience significant neurological compromise affecting ambulation and continence. Management of familial caudal dysgenesis is multidisciplinary and primarily supportive, as no curative treatment exists. Orthopedic interventions may be needed for spinal or lower limb deformities, urological management for neurogenic bladder (including clean intermittent catheterization), and bowel management programs for fecal incontinence. Neurosurgical evaluation is important to assess for tethered spinal cord, which may require surgical release. Renal function should be monitored regularly given the risk of urinary tract anomalies and recurrent infections. Genetic counseling is recommended for affected families.

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