KIDNEY - Injury and infarction

This consists of half of each kidney; the one on the right-hand side shows numerous areas of infarction; the reddish ones are more recent than the yellowish ones. The left specimen, as the jar faces you, shows half-a-kidney, in which, again, there are areas of infarction particularly at the upper pole, while towards the lower pole there is a haemorrhagic area, which has probably arisen at the site of a renal biopsy. There are areas of haemorrhage in the pelvis.
This man presented with melena, a left pleural effusion, and decreasing renal function over a period of 2 months. A renal biopsy showed the condition of poly-arteritis nodosa.