Simple hepatic cyst
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Simple hepatic cysts are common benign liver lesions and have no malignant potential. They can be diagnosed with ultrasound, CT, or MRI.
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Simple hepatic cysts are one of the commonest liver lesions, occurring in ~5% (range 2-7%) of the population 1,2. There may be a slight female predilection.
Hepatic cysts are typically discovered incidentally and are almost always asymptomatic. They can demonstrate slow growth over time, although rapid size increase may be caused by internal hemorrhage 3.
Simple hepatic cysts may be isolated or multiple and may vary from a few millimeters to several centimeters in diameter. Simple hepatic cysts are benign developmental lesions that do not communicate with the biliary tree 2. The current theory regarding the origin of true hepatic cysts is that they originate from hamartomatous tissue. On histopathological analysis, true hepatic cysts contain serous fluid and are lined by a nearly imperceptible wall consisting of cuboidal epithelium, identical to that of bile ducts, and a thin underlying rim of fibrous stroma 2.
While they can occur anywhere in the liver, there may be a greater predilection towards the right lobe of the liver 4.
Certain diseases are associated with multiple hepatic cysts and include
autosomal dominant polycystic kidney disease (ADPKD): hepatic cysts may be seen in ~40% of those with ADPKD 2
They are typically round or ovoid in shape and have well-defined margins. The cyst wall is very thin or even imperceptible 5.
round or ovoid anechoic lesion (may be lobulated)
well-marginated with a thin or imperceptible wall and a clearly defined back wall
may show posterior acoustic enhancement, if large enough
a few septa may be possible, but no wall thickening
a small amount of layering debris is possible
no internal vascularity on color Doppler
On CT, a hepatic cyst is usually well-circumscribed and demonstrates homogeneous hypoattenuation (water attenuation) around 0-10 HU. The wall is usually imperceptible, and the cyst does not enhance after intravenous administration of contrast material.
On MR imaging a hepatic cyst follows the signal intensity of water on all sequences:
T1: homogeneous very low signal intensity
T2: increased signal intensity, greater than other T2 hyperintense liver lesions (e.g. hemangioma)
T1 C+: hepatic cysts do not enhance after administration of any type of contrast
In instances of intracystic hemorrhage, which is a rare complication in simple hepatic cysts, the signal intensity is high and heterogeneous, with a fluid-fluid level on both T1- and T2-weighted images when mixed-blood products are present 2. Also, elevated T1 signal can be seen in proteinaceous content. For both these circumstances, using imaging subtraction can be essential when assessing for the presence of enhancement.
General imaging differential considerations include other cystic liver lesions, including:
choledochal cyst: communicates with the biliary tree
necrotic hepatic metastasis (would probably have lower T2 than a cyst, higher CT attenuation, and enhancement of a thickened wall)
On CT and T2 MRI images also consider:
On the LI-RADS classification system, a simple cyst is given a designation of LR1 or LR2.
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