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. Author manuscript; available in PMC: 2023 Dec 13.
Published in final edited form as: J Am Coll Cardiol. 2022 Nov 2;80(24):e223–e393. doi: 10.1016/j.jacc.2022.08.004

TABLE 30.

High-Risk Imaging Features of IMH

For Type A IMH For Type B IMH

■ Maximum aortic diameter >45–50 mm18,20 ■ Maximum aortic diameter >47–50 mm15,20
■ Hematoma thickness ≥10 mm4 ■ Hematoma thickness ≥13 mm15
■ Focal intimal disruption with ulcer-like projection involving ascending aorta or arch18,21 ■ Focal intimal disruption with ulcer-like projection involving the descending thoracic aorta if it develops in acute phase15,16
■ Pericardial effusion on admission18 ■ Increasing or recurrent pleural effusion19,22

For Both Type A and Type B IMH

■ Progression to aortic dissection19
■ Increasing aortic diameter21,22
■ Increasing hematoma thickness21,22

IMH indicates intramural hematoma.