Loss of temperature/pain sensation

What it is

Loss of temperature and pain sensation is a characteristic sensory change caused by a syrinx in Chiari malformation, in which a person loses the ability to feel temperature and pain in affected areas while the sensation of touch is often relatively preserved (a "dissociated" sensory loss).

Understanding Loss of temperature/pain sensation

The fibers carrying pain and temperature sensation cross through the central part of the spinal cord, exactly where a syrinx tends to form. As the syrinx interrupts these fibers, pain and temperature sensation are lost — often over the shoulders and arms (a "cape-like" distribution) with a cervical syrinx — while touch (carried elsewhere in the cord) is relatively spared. A practical consequence is that affected individuals may not feel hot objects or minor injuries, leading to unnoticed burns or wounds. This characteristic pattern is an important clue to syringomyelia. Recognizing the sensory loss helps both in diagnosis and in advising safety precautions. Understanding loss of temperature/pain sensation clarifies a hallmark sensory feature of a syrinx and its practical implications.

Why it matters

Understanding loss of temperature/pain sensation helps families recognize a hallmark sign of a syrinx in Chiari, and see its practical importance — affected individuals may not notice burns or injuries, so safety precautions matter.