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Photo: skin tag.
Annotated images show: dermal sinus tract extends from the skin surface to the thoracic spinal cord opposite T3 via the widened T2/3 interspinous space (Red arrows), the thoracic spinal cord opposite T3 shows intramedullary increased signal (cord malacia).
Association: unfused posterior arches (spinous processes) of C6 down to T4 vertebrae (spina bifida occulta).