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High ferritin levels in the aspirate of thyroid cyst (Six yellow clear, 4 yellow turbid and 10 chocolate colored turbid) without apparent sings of malignancy were found. The mean concentration in the 3,000 X g supernatant of the fluid was 40,116 ng/ml, and the 3,000 X g precipitate was 11,147 ng/ml. All cases showed normal levels of serum ferritin. Con A binding with ferritin was distributed from low to high. These ferritins showed a molecular weight of approximately 450,000 which was the same as found in human spleen and liver. The continuous increase in ferritin levels in thyroid cyst fluid was found by a chronological study in some cases. When tumor markers such as CEA, NCA, CA 19-9 and alpha 1-acid glycoprotein (alpha 1-AG, acute phase reactant) were examined simultaneously, an increase in some of the cyst fluid was observed. However, the incidence and the rate of increase of these tumor markers and acute phase reactant were low compared to ferritin. Neither a correlation between ferritin and CEA, nor between ferritin and CA 19-9 was found. The increase in ferritin in thyroid cyst fluids may be due to the increased synthesis, release and storage by the inflammatory cells.

Increased ferritin levels in the fluid of thyroid cyst.