Pancoast's syndrome associated with invasive aspergillosis.

The combination of lower brachial plexus root pain in the shoulder and arm and of ipsilateral Horner's syndrome was described by Pancoast in 1932 and is usually caused by a malignant tumour at the apex of the lung. We describe a case in which the syndrome occurred in an immunosuppressed patient and was due to invasive fungal infection.