A case of extraskeletal myxoid chondrosarcoma with intracisternal micr
otubules is presented. The microtubules were generally straight, paral
lel, closely packed, and evenly spaced, but they did not form geometri
c arrays. Aggregates of stromalike myxoid material were present in the
cisternae and the adjacent cytoplasm. Microtubules were never found w
ithin the cytoplasm. A similar ultrastructural appearance was seen in
4 of 10 other examples of extraskeletal myxoid chondrosarcoma.