Cases
Man in his 60s with a periureteral mass   

Diagnosis and questions

Differential diagnosis:

  • Angiosarcoma
  • Anastomosing hemangioma (AH)
  • Retiform hemangioendothelioma
  • Hobnail hemangioma
  • Encapsulated accessory spleen 
  • Splenosis

Diagnosis: Anastomosing hemangioma (AH)

What are the essential features of AH?
Benign vascular tumors
Anastomosing sinusoidal capillary-sized vessels
Mild endothelial nuclear variability
Scattered hobnailed endothelial cells
All of the above

What are the positive stains for AH?
CD31
CD34
ERG
All of the above