Definition:

Temporal enhancement pattern in which enhancement in all phases approximates that of the blood pool. 

Comments:

• Applies to observations that enhance in all phases to a similar degree as the blood pool. Radiologists at their discretion may apply parallels blood pool enhancement to downgrade category.
  • This temporal enhancement pattern is a characteristic feature of hemangioma. Most masses with this pattern are hemangiomas and usually can be interpreted as definite or probable hemangiomas. Some masses with this pattern cannot be confidently diagnosed as definite or probable hemangiomas due to small size or presence of features not characteristic of hemangiomas. For such masses, this enhancement pattern is an ancillary feature favoring benignity.