A 50-year-old man presented with a persistently warm left foot, which did not perspire. What initially seemed to be an innocent disorder turned out to be a retroperitoneal germ cell tumour situated at Liii-Liv. In most people this location is the site of the lumbar paravertebral ganglia (an important part of the sympathetic nervous system). The fact that these ganglia were affected by the tumour explained the autonomic dysfunction in this case. The patient received curative chemotherapy. Exploration of the symptoms with respect to the pathophysiology and anatomy of the autonomous nervous system might have led to an earlier diagnosis.
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