Psoas haematoma - right

Case contributed by Dr Dayu Gai


This 25 year old male was stabbed in the right thoracic back area. He lost approximately 1 litre of blood, and was hypotensive on arrival to the hospital. A CT Trauma Series was performed.

Patient Data

Age: 25 years
Gender: Male
  • Right psoas haematoma as described secondary to penetrating injury with a small amount of retroperitoneal haematoma anterior to the psoas. No evidence of renal parenchymal, vascular injury or CT evidence of active bleeding.

Case Discussion

Psoas haematomas can occasionally occur after trauma, where a build up of blood occurs in the retrofascial space. The psoas muscles are placed posterior to the transversalis fascia, so technically sits outside the peritoneum.

Psoas haematoma is usually associated with direct blunt trauma to the back and flank. They can be associated with a large degree of haemorrhage which is clinically difficult to detect, due to the retrofascial site of the haemorrhage. It is recommended that the patient's haemoglobin level be monitored for at least 2 days post trauma1, as a large amount of blood can be lost within this large muscle.

Injuries associated with psoas haematoma include ureteral compression and nerve compression. In these cases, operative decompression would be undertaken. Usually, conservative monitoring is the treatment of choice.

In this patient, note the bulky right psoas muscle which is much more heterogeneous in comparison the left sided psoas. This is due to the extravasation of blood from the original traumatic event.

Case contributed by A/Prof. Pramit Phal.

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Case information

rID: 31563
Published: 20th Feb 2015
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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