MAXILLARY ADENOID CYSTIC CARCINOMA WITH ANNULATE LAMELLAE

Of 29 reviewed ultrastructural studies of adenoid cystic carcinoma, on ly 1 mentions the presence of annulate lamellae. The present report de scribes a 65-year-old woman who presented with an adenoid cystic carci noma in her left maxillary sinus. At the light microscopic level, most of the connective tissue was loose and myxomatous and contained fine strands, cords, and islands of epithelium that in places had a cribrif orm pattern. The ultrastructural appearance was similar to that descri bed by others. Two epithelial cell types predominated. The cytoplasm o f one type contained mainly ribosomes, and that of the other type also had peripheral microfilaments. Also present were pseudocysts, lumina with microvilli, and replicated basal lamina. In addition, a number of both types of cells contained parallel arrays of cisternae that had r egular small pores. These were annulate lamellae.