Pure primary ovarian carcinoid tumors are uncommon and only 21 cases h
ave been recorded in the literature. In the past 15 years, we have see
n two cases. One was strumal carcinoid and the other, the case present
ed here, was a primary ovarian carcinoid tumor arising from the left o
vary of a 25-year-old woman who had no carcinoid syndrome. the tumor w
as made up of pure carcinoid tumor without other teratomatous elements
. On light microscopy the neoplasm,composed of uniform tumor cells, wa
s arranged in solid nests or a trabecular pattern. The differential di
agnosis included granulosa cell tumor, Brenner tumor, Sertoli-Leydig c
ell tumor and metastatic carcinoid tumor. However, the strongly argyro
philic, chromogranin staining and ultrastructural presence of neurosec
retory granules confirmed the diagnosis of primary ovarian carcinoid t
umor. After a careful survey of the contralateral ovary and the gastro
intestinal tract, the patient underwent a left oophorectomy. Her posto
perative course was uneventful. The literature and the pathologic find
ings are reviewed and discussed, along with the differential diagnosis
and treatment of primary ovarian carcinoid tumor.