| Fibrin and platelet thrombi were prominent in the lumina of the vessels and in the space beneath the endothelium. |
| These loose columnals may have had soft matrix removed from the central lumina and, thus, would have been very bead-like in appearance. |
| Microscopically, large neoplastic lymphoid cells with prominent nucleoli and frequent mitotic figures occlude small vessel lumina. |
| The lumina are filled with cellular detritus and are no longer bordered by a clear ring of sustentacular cytoplasm. |
| The main products of Si accumulation are the phytoliths, or silica bodies, which infill the cell walls and lumina of certain cells in plant tissues. |
| Any agent which acts to produce thickening of the walls of the arterioles, narrowing their lumina, produces the same effect. |
