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  • Title: Segmental abdominal wall paresis caused by lateral low thoracic disc herniation.
    Author: Stetkarova I, Chrobok J, Ehler E, Kofler M.
    Journal: Spine (Phila Pa 1976); 2007 Oct 15; 32(22):E635-9. PubMed ID: 18090072.
    Abstract:
    STUDY DESIGN: Clinical, radiologic, and neurophysiologic description of 2 cases. OBJECTIVE: To describe 2 cases with spontaneous deep unilateral abdominal pain as the first symptom of thoracic disc herniation at a low thoracic vertebral level, further manifested by unilateral partial paresis of the obliquus abdominis muscle. SUMMARY OF BACKGROUND DATA: Clinical manifestation of lateral thoracic disc herniation with electrophysiologic results and conservative therapy as treatment of choice when spinal cord functions are preserved. METHODS: Magnetic resonance imaging revealed bilateral paramedian disc protrusions at T12-L1 in Patient 1 and foraminal herniation at T10-T11 and paramedian herniation at T11-T12 in Patient 2. Electromyography (EMG) and evoked potentials were investigated in the acute stage and after 6 months. RESULTS: Spontaneous activity on needle EMG confirmed axonal root impairment. Somatosensory and motor-evoked potentials were within normal limits and excluded spinal cord involvement. Nonsteroidal anti-inflammatory drugs and periradicular injection of steroids and local anesthetics rendered both patients pain-free. Normalization of muscle strength within 3 to 6 months was accompanied by EMG findings of reinnervation. CONCLUSION: Lateral disc herniation causing compression of a thoracic root associated with unilateral segmental paresis of the abdominal wall is a rare condition. Despite EMG documentation of axonal root lesion, however, a purely conservative therapeutic approach may be considered treatment of choice in cases without spinal cord involvement.
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