Massive omental reticuloendothelial cell lipid uptake in Tangier disease after splenectomy.

Tangier disease is a rare, autosomal recessive condition characterized by cholesterol ester deposition in reticuloendothelial cells, abnormal chylomicron remnants, decreased low-density lipoprotein levels, and a marked deficiency of high-density lipoproteins. Apolipoprotein A-I, a major protein constituent of chylomicrons and high-density lipoproteins, has been shown to be structurally and metabolically abnormal in this disease (apolipoprotein A-ITangier). A 63-year-old Tangier homozygous man is described, who underwent splenectomy because of thrombocytopenia and splenomegaly. Subsequently, a large orange mass developed at the base of the mesentery, with several smaller omental masses and thickening of the entire omentum due to infiltration with lipid-laden macrophages. Splenectomy appears to predispose to such deposition, since such masses have not been observed in other Tangier homozygotes. The spleen appears to play a significant role in the removal of abnormal lipoproteins in Tangier homozygotes; therefore, splenectomy may be contraindicated in Tangier disease.