|
Definition:
Presence of intra-lesional or peri-lesional hemorrhage in absence of biopsy, trauma or intervention.
Usage:
- Blood products in or around a lesion in the absence of biopsy, trauma, or intervention is an ancillary feature favoring malignancy.
- Radiologists at their discretion may apply this ancillary feature to upgrade category (up to LR-4).
- MRI is more sensitive and specific for detection of blood products than CT.
- At MRI, blood products usually manifest as areas of heterogeneous, predominantly high signal intensity on T1w images and heterogeneous, predominantly low signal intensity on T2w images. Due to T2* shortening, there may be signal loss on the second echo of a dual-echo gradient-echo sequence.
- At CT, blood products usually manifest as areas of heterogeneous hyperattenuation.
If unsure about feature:
- Do not characterize as blood products
Synonyms:
Potential pitfalls and challenges:
- Diameter reduction should not be used as an ancillary feature favoring benignity in observations that reduce in size following resorption of acute bleed.
|