Anastomosing Haemangioma of the Kidney Involving a Segmental Branch of the Renal Vein

Abstract

Anastomosing variant of capillary haemangioma is a rare and recently described vascular tumour with a proclivity for the genitourinary tract. Here we present the case of a 64-year-old man with incidental finding of 3.4 cm renal mass on CT who had laparoscopic nephrectomy with a good postoperative recovery. Histopathological diagnosis of anastomosing haemangioma of the kidney was made and the patient was followed up for 10 months without evidence of tumour recurrence.

Figure 1

CT imaging of the mid pole solid mass of the left kidney.

Figure 2

(a) Macroscopic image of the tumour in the renal hilum with involvement of the branch of a segmental renal vein (arrowed). (b) 40x H&E showing the tumour with sieve-like pattern. (c) 20x H&E demonstrating the involvement of the tributary of a segmental renal vein (vessel wall arrowed). (d) 200x H&E showing round to oval vasoformative endothelial cells with hobnail appearance (arrowed).

Figure 3

(a) 200x H&E showing fibrin thrombi within some vascular spaces. (b) showing CD34 immunohistochemistry staining the endothelium in the tumour as well as the segmental renal vein branch (arrowed) (×20). (c) demonstrating smooth muscle actin immunohistochemistry staining the tumour pericytes (arrowed) and vessel wall (×20). (d) showing CD34 immunohistochemistry staining supporting pericytes (×40).