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Typically referring to a measurement on an imaging study (xray, CT scan, MRI, ultrasound), sub-centimeter refers to a measurement less than 1 centimeter.
Overview. Subchorionic hemorrhage (subchorionic hematoma) is the most common sonographic abnormality in the presence of a live embryo. Vaginal bleeding affects 25% of all women during the first half of pregnancy and is a common reason for first-trimester ultrasonography.onographic visualization of a subchorionic hematoma is important in a symptomatic woman because pregnant women with a demonstrable hematoma have a prognosis worse than women without a hematoma (see example images below). However, small, asymptomatic subchorionic hematomas do not worsen the patient's prognosis.