It has a sensitivity of 96 to 100% and a specificity of 96 to 100%. Disadvantages include the need for iodinated contrast material and the inability to diagnose the site of the intimal tear. MRI
Magnetic resonance imaging (MRI) is also used for the detection and assessment of aortic dissection, with a sensitivity of 98% and a specificity of 98%. An MRI examination of the aorta produces a three-dimensional reconstruction of the aorta, allowing the physician to determine the location of the intimal tear and the involvement of branch vessels, and to locate any secondary tears. It is a noninvasive test, does not require the use of iodinated contrast material, and can detect and quantitate the degree of aortic insufficiency.The disadvantage of the MRI scan in the face of aortic dissection is that it may be available only in larger hospitals, and the scan is relatively time-consuming, which could be dangerous in people who are already very unwell. Due to the high-intensity magnetic fields used during MRI, it cannot be used on individuals with metallic implants. In addition, some individuals experience claustrophobia while surrounded by the MRI magnet. Ultrasound
The transesophageal echocardiogram (TEE) is a good test in the diagnosis of aortic dissection, with a sensitivity up to 98% and a specificity up to 97%. It has become the preferred imaging modality for suspected aortic dissection. It is a relatively noninvasive test, requiring the individual to swallow the echocardiography probe.
An inverted nipple (occasionally invaginated nipple) is a condition where the nipple, instead of pointing outward, is retracted into the breast. In some cases, the nipple will be temporarily protruded if stimulated. Both women and men can have inverted nipples. Causes
The most common causes of nipple inversion include:

Born with condition
Trauma which can be caused by conditions such as fat necrosis, scars, or a result of surgery
Breast sagging, drooping or ptosis
Breast cancer
Breast carcinoma
Pagets disease
Inflammatory breast cancer
Breast infections or inflammations
Mammary duct ectasia
Breast abscess
Mastitis
Genetic variant of nipple shape, such as:
Weaver syndrome
Congenital disorder of glycosylation type 1A and 1 L
Kennerknecht-Sorgo-Oberhoffer syndrome
Gynecomastia
Recurrent infections
TuberculosisMost common nipple variations that women are born with are caused by short ducts or a wide areola muscle sphincter. Inverted nipples can also occur after sudden and major weight loss. Grading system
The three grades of inverted nipples are defined on how easily the nipple may be protracted and the degree of fibrosis existent in the breast, as well as the damage it has caused on the milk ducts. Inverted nipple grade 1 refers to nipples that can easily be pulled out, by using finger pressure around the areola. The grade-1 inverted nipple maintains its projections and rarely retracts. Also, grade-1 inverted nipples may occasionally pop up without manipulation or pressure. Milk ducts are usually not compromised and breast feeding is possible. These are "shy nipples". It is believed to have minimal or no fibrosis. There is no soft-tissue deficiency of the nipple.