AM

Key words: Horner syndrome, miosis, ptosis, superior pulmonary sulcus tumour, sympathetic nervous system Horner syndrome is the collection of signs produced by interruption of the sympa-thetic pathway to the eye and face. It is defined clinically by ipsilateral miosis, par-tial ptosis, apparent enophthalmos and anhidrosis. The diagnosis of Horner syn-drome is based on clinical observation but may be confirmed by pharmacological testing. Its causes range from benign to life threatening. We present a case of Pancoast (superior pulmonary sulcus) tumour, in which acquired Horner syn-drome was a feature at presentation and we discuss the pathophysiology and a diag-nostic approach for patients with Horner syndrome. CASE REPORT JG, a 59-year-old clerical worker, was admitted to the Cardiothoracic Care Cen-tre for investigation in July 2005, following a three-month-history of gradually worsen-ing right arm pain and right hand weak-ness that were unresponsive to simpl