In the heart, they usually arise from a patch of weakened tissue in a ventricular wall, which swells into a bubble filled with blood.

In other cases, a similarly developed pseudoaneurysm ("false aneurysm") may burst, sometimes resulting in the death of the patient.

It can also appear as a bulge on a chest x-ray, and a more accurate diagnosis will then be made using an echocardiogram, which uses ultrasound to 'photograph' the heart and how it functions while it beats.

[citation needed] It should also not be confused with a pseudoaneurysm,[4][5] coronary artery aneurysm or a myocardial rupture (which involves a hole in the wall, not just a bulge.)

Fibrous diverticulum is characterised by a calcification if present at the tip ( apex) or a thrombi that may detaches to form an emboli.

Usually, surgical resection is advised but in prenatal cases, due to combination with other cardiac abnormalities, especially in latter trimesters, but pericardiocentesis is useful technique to reduce pleural effusion or/ and secondary disorders.

However, surgery is not required in most cases but, limiting the patient's physical activity levels to lower the risk of making the aneurysm bigger is advised.