Hematoma Complications

Main localizations and types of surgical hematomas

In practical surgery, collections of extravasated blood are classified according to their anatomical location, as each localization carries specific risks for the patient. In particular, researchers distinguish subcapsular hepatic hematoma, as well as hemorrhages topographically associated with vascular bed damage in the abdominal cavity: intraperitoneal, retroperitoneal, and intramural aortic hematomas.

Retroperitoneal blood collections, which often form as a result of abdominal aortic aneurysm rupture, are of particular clinical significance. The occurrence of such a pathological focus is considered by surgeons as a strong indication for open surgical treatment. This is because massive hemorrhage into the retroperitoneal space provokes the development of severe conditions, primarily intra-abdominal hypertension (IAH) and abdominal compartment syndrome (ACS).

Complicated course of aortic wall pathologies

Pathological changes in the wall of large blood vessels are frequently accompanied by the formation of specific hematomas. Treatment tactics largely depend on whether the process has progressed to a complicated stage.

1. Complicated intramural hematoma (IMH) The diagnosis of a complicated form is established when the patient presents with characteristic pain attacks and a confirmed increase in the size of the hemorrhage (growth of IMH). Critical signs also include the formation of a periaortic hematoma, the presence of an intimal tear, and the development of malperfusion syndrome (impaired adequate blood supply to internal organs).

2. Complicated penetrating aortic ulcer (PAU) This pathology is considered complicated if it is accompanied by pain attacks, clinical symptoms of embolism, or an increase in the total diameter of the abdominal aorta. In addition, an important criterion is the formation of an extra-aortic hematoma, which can transform into a pseudoaneurysm (false aneurysm). There are also clear morphometric criteria: initial ulcer dimensions exceeding 20 millimeters in width or 10 millimeters in depth automatically classify it as complicated.

Hematomas in the structure of acute aortic syndrome (AAS)

Various types of hematomas are a key component of acute aortic syndrome. When describing this condition, the type of pathology must be taken into account: aortic dissection, the presence of an intramural or periaortic hematoma, or a penetrating atherosclerotic ulcer.

Diagnostic workup must clearly determine the extent of the process (proximal and distal boundaries of the lesion) and identify the primary fenestration—the site of the intimal tear acting as the entry point for blood.

Spectrum of AAS complications:

• Hemorrhages and ruptures: complete or contained rupture of the vessel wall, development of massive mediastinal or periaortic hemorrhage.
• Effusion formation: accumulation of blood in adjacent cavities as hemopericardium (in the pericardial cavity) or hemothorax (in the pleural cavity).
• Compression syndrome: mechanical compression of adjacent anatomical structures by a hematoma increasing in volume.
• Radiological phenomena: active extravasation (escape beyond the vascular bed) of iodine-containing radiopaque agents during imaging studies.

Class and exam questions

What else to study on this topic

• Intra-abdominal hypertension and abdominal compartment syndrome (ACS)
• Pathophysiology of malperfusion syndrome in vascular catastrophes
• Surgical management tactics for false aneurysms (pseudoaneurysms)
• Differential diagnosis of acute aortic syndrome types
• Radiological signs of active contrast extravasation

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.