The morphological basis of bilateral lower abdominal pain was studied by means of ultrastructural observation in patients with pelvic congestion syndrome after oviductal Iigation. Fallopian tubes of 14 cases were collected during opera tion. Of them, 10 patients suffered from pelvic congestion syndrome, 4 cases were normal used as control, the 8 small segments from the tubal isthmus were removed during tigation. The essential changes of the fallopian tubes in patients with this syndrome were the marked swelling of the C type unmyeIinated nerve fibers, the decrease in density of axoplasm and in number of microtutbules and microfitaments. The Schwann's cells were swollen as welt. Furthermore, the mitochondria revealed mild to moderate swelling, their cristae decreased and shortened. However, the changes of the endings of efferent nerve fibers were not obvious.The ultrastructural changes of C-type unmyeIinated nerve fibers except the endings of efferent nerve fibers were closely related to the bilateral lower abdominal pain in patients with this syndrome.
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