Microscopically, the specimen showed a distinctive biphasic pattern of epithelioid polygonal cells and fibroblast-like spindle-shaped cells.
(the specimen; showed; a distinctive biphasic pattern of epithelioid polygonal cells and fibroblast-like spindle-shaped cells)
the specimen
showed
a distinctive biphasic pattern of epithelioid polygonal cells and fibroblast-like spindle-shaped cells