Question

After a chest CT scan, I was told a "cold spot" showed up on my liver. I had a follow-up sonogram which cannot identify it as a cyst, as was originally suspected. I was told it is a tiny mass which has not changed since the CT scan and I should be followed up in 6 months. Is this a normal time frame? What would a mass indicate?

Answer

This is a problem with tests used to screen organs and areas that are not involved in a clinical syndrome. A syndrome is a collection of signs and symptoms that indicate a set of conditions called a diagnosis. It provides a framework for test results. When there are no signs and symptoms, a finding is more likely to be a "false positive" than it is to be a real significant finding.

By "cold spot" I presume you mean that it did not light up on contrast? (I'm more familiar with that designation in nuclear medicine, not computed tomography.) That indicates a relative lack of vascularity (less rich in blood vessels), either a cyst, dead, inert tissue, or a solid mass of poor definition. Since the sonogram did not show the "hollowness" of a cyst, that leaves either an irregularity in the tissue or a poorly fed mass. Most cancers -- that is your main worry, I assume -- are vascular. Moreover, the liver is known to have "irregularities" in its own consistency with no adverse effect or consequence. Blood tests may help suggest whether the liver "detects" a mass effect.

Are you sick in any way? (I'd suspect not with a liver problem.) Why was the CT done? The six-month wait is eminently reasonable and quite standard, unless you know of some circumstance or clue that would indicate more aggressive diagnostic follow-up.