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1 From the Departments of Radiology, Cambridge City Hospital and Harvard Medical School, Cambridge, Massachusetts
Acute hematoma in the rectus sheath is manifested on the lateral roentgenogram as a placenta shaped or ovoid spindle shaped mass in the anterior abdominal wall, or as widening of the rectus shadow.
Chronic hematoma with ossification shows a thin walled, shell like, broad ossified mass in the widened rectus shadow, since it is confined in the tight compartment of the rectus sheath.
A postoperative scar with ossification is finger thick, curved, elongated, pencil shaped with a diameter about 2 x 2 cm. or more. Its location in the anterior abdominal wall is more superficial, separated from the rectus. It is embedded in the scar tissue and follows its course.
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