Isolated transitional filum lipoma

Isolated transitional filum lipoma is a rare congenital spinal anomaly classified under other specified congenital malformations of the spinal cord (ICD-10: Q06.8). This condition involves the presence of fatty tissue (lipoma) within the filum terminale, the thin filament that extends from the conus medullaris (the terminal end of the spinal cord) to the coccyx. The term 'transitional' refers to the location of the lipomatous infiltration at the junction between the conus medullaris and the filum terminale. Unlike more complex forms of spinal lipomas or lipomyelomeningoceles, this condition occurs in isolation without other associated spinal dysraphism or neural tube defects. The filum terminale lipoma may be discovered incidentally on imaging or may present with symptoms related to tethered cord syndrome, which occurs when the fatty infiltration causes abnormal tethering of the spinal cord. When symptomatic, patients may experience lower back pain, lower extremity weakness or sensory changes, bowel or bladder dysfunction, and progressive neurological deterioration, particularly during periods of growth. Many cases, however, remain asymptomatic throughout life. Management depends on whether the condition is symptomatic. Asymptomatic patients identified incidentally may be monitored with periodic clinical and imaging follow-up. For symptomatic patients or those showing progressive neurological decline, surgical intervention involving sectioning (cutting) of the filum terminale to release the tethered cord is the standard treatment. This procedure generally has favorable outcomes when performed before irreversible neurological damage occurs. Early diagnosis and appropriate monitoring are important to prevent long-term complications.

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