A 50-year-old man presents with
malaise, weight loss, diarrhoea and pain in the joints. He is pigmented, has
clubbing and lymphadenopathy. He has ascites and ophthalmoplegia.
Investigations show him to be anaemic. ECG shows a right bundle branch
block and paracentesis abdominis reveals chylous ascites.
The investigation most likely
to give a diagnosis would be:
Ascitic fluid cytology
Small bowel biopsy