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CTA multiphasic study of caecum sentinel clot in a patient with hematochezia. A small amount of spontaneous hyperdensity is collected at caecal fondus, resulting visible in the pre-contrast (a), arterial (b) and venous (c) phases with analogous morphologic and densitometric characteristics (a–c, arrow). This finding is suggestive of a sentinel clot and presumable recent bleeding.
