A<unk>  may appear as a ridge running down the midline of the abdomen, anywhere from the xiphoid process to the umbilicus. It becomes more prominent with straining and may disappear when the abdominal muscles are relaxed. The medial borders of the right and left halves of the muscle may be palpated during contraction of the<unk> s abdominis. The condition can be diagnosed by physical exam, and must be differentiated from an epigastric hernia or incisional hernia, if the patient has had abdominal surgery. Hernias may be ruled out using ultrasound. In infants, they typically result from a minor defect of the linea alba between the<unk> s abdominis muscles. This allows tissue from inside the abdomen to herniate anteriorly. On infants, this may manifest as an apparent 'bubble' under the skin of the belly between the umbilicus and xiphisternum (bottom of the breastbone). Examination is performed with the subject lying on the back, knees bent at 90° with feet flat, head slightly lifted placing chin on chest. With muscles tense, the examiner then places fingers in the ridge that is presented. Measurement of the width of separation is determined by the number of fingertips that can fit within the space between the left and right<unk> s abdominis muscles. Separation consisting of a width of 2 fingertips (approximately 1 1/2 centimeters) or more is the determining factor for diagnosing<unk> .
Diastasis recti
Osteoma cutis
Cold abscess
Granuloma inguinale
Protrusio acetabuli
Traumatic calcinosis cutis
Myxoid cyst
Myositis ossificans