Angio-fibroma bleeds

Q-6. Angio-fibroma bleeds excessively because
a) It lacks a capsule
b) Vessels lack contractile component
c) It has multiple sites of origin
d) All of the above

Answer: Vessels lack contractile component
Explanation:
Nasopharyngeal angio-Fibroma:
Juvenile Angio-Fibroma (JNA) or Nasopharyngeal Angio-Fibroma is a benign tumor that tends to bleed and occurs in the naso-pharynx of pre-pubertal and adolescent males.
It is commonest of all benign tumors of naso-pharynx.
Mostly, the vessels are just endothelium lined space with no muscle coast.
This accounts for the severe bleeding as the vessels loss the ability to contract.
Profuse and recurrent bleeding is the most common presentation.