Fibrolipomatous hamartoma of the median nerve in a child with carpal tunnel syndrome: imaging findings and literature review

Fibrolipomatous hamartoma of the median nerve is an uncommon benign tumour of the childhood, which usually manifests in adolescents or adulthood with signs of compressive neuropathy at wrist. Symptomatic tumour is unusual in children below 5 years age and can be underdiagnosed. Magnetic resonance imaging provides pathognomonic features for the diagnosis, obviating the need for biopsy. Although standard ultrasonography is frequently the first-line imaging approach in the evaluation of soft-tissue masses, sonographic findings of this lesion are less frequently reported and have to be kept in mind by radiologist. We report the unusual case of carpal tunnel syndrome secondary to fibrolipomatous hamartoma of the median nerve in a 4-year-old child successfully treated with surgical carpal tunnel release.