HX:A 70 year old man with anemia and right trunk palpable mass, lower extremity DVT .

Findings: Thick fluid in posterior pararenal space,heterogeneous enlargement of right psoas muscle.

Diagnosis: Anticoagulant related hematoma.

Discussion: Spontaneous bleeding is a serious complication that should be promptly recognized and treated.

CT, a simple and safe imaging modality, plays an important role in the accurate determination of the presence or absence of an anticoagulant- related bleed , its extent, and its precise location.