A 79 year old man presented with occult gastrointestinal bleeds and anaemia
for two years. He had received 40 units of blood over a period of one year
, following which he had a subtotal colectomy as no definite cause of the b
leeding was apparent. Macroscopically the colon appeared unremarkable. Ligh
t microscopy showed prominent lymphocytic venulitis in the proximal portion
, gradually merging into lymphocytic and collagenous colitis distally.