Ovarian ﬁbromas are benign stromatogenous tumors. The most common benign ovarian tumor, this tumor is composed of stromal cells (ﬁbroblasts). Although benign, these tumors are sometimes associated with ascites and hydrothorax (Meigs syndrome, 1% of patients). They may be minute or may reach a diameter of more than 27 cm. Unilateral involvement is usual (90%). Multiple ﬁbromas of a single ovary occur occasionally (10%). Though encountered at any age, the majority are found postmenopausally. Because of its weight, torsion of the pedicle is apt to occur.
Fibromas are well-encapsulated, solid, heavy, oval, grayish-white tumors with an irregularly bossed, smooth surface. Adhesions may be present. The cut surface discloses dense, white, interlacing bundles of connective tissue. The larger neoplasms may show focal or diffuse areas of edema, hemorrhage, degeneration, and cyst formation. The cystic cavities result from tissue necrosis and may be irregular or ragged and ﬁlled with clear or blood-tinged ﬂuid. Isolated or diffuse calciﬁcation occurs in 10% of cases. Microscopically, the tumor is composed of interlacing strands or whorls of spindle-shaped cells. The individual cell presents an indistinct border, a moderate amount of ﬁnely granular cytoplasm, and an elongated, deeply stained nucleus. In the larger ﬁbromas, circulatory deprivation may result in edema, hemorrhage, infarction, degeneration, necrosis, and calciﬁcation. In edematous areas, the cells are widely separated and stellate in appearance. Dilated lymphatic channels may be conspicuous. Hyalinization is evidenced by the deposition of pink-staining homogeneous collagenous material. Phagocytic cells containing fatty material may be seen in areas of necrosis. Infarction may be manifested by a diffuse inﬁltration with erythrocytes, degeneration, and necrosis. Calciﬁcation is indicated by the deposition of granules or masses of darkly stained basophilic material.
If small, an ovarian ﬁbroma may be asymptomatic. Those of larger size may give rise to localized discomfort or pain, pressure symptoms, and abdominal enlargement. The presence of a unilateral, hard, movable ovarian tumor with ascites, or ascites and hydrothorax, is most suggestive. Therapy for ovarian ﬁbroma is surgical extirpation.
Meigs syndrome refers to the association of ascites and hydrothorax with a pelvic neoplasm, particularly ovarian ﬁbromas. The syndrome has also been encountered with ﬁbroadenomas, ﬁbrosarcomas, Brenner tumors, theca cell tumors, teratomas, serous cystadenomas, multilocular pseudomucinous cystadenomas, adenocarcinomas, papillary cystadenocarcinomas, and even ﬁbromyomas of the uterus. Ascites is present with the majority of ovarian ﬁbromas of moderate or large size (40% if the tumor is >10 cm.). The right side of the chest is involved in 75% of cases, the left in 10%, and both in 15%. No relationship between the side of the ovarian tumor and the side of the hydrothorax seems to be apparent. Varying amounts of ﬂuid may accumulate rapidly in the peritoneal and pleural cavities. The pathophysiology of ascites in Meigs syndrome is speculative. The hydrothorax and hydroperitoneum disappear completely with removal of the pelvic tumor. Differentiation must be made from a malignant tumor with pulmonary metastases, cardiac or renal disease, hepatic cirrhosis, and tuberculous peritonitis.
Fibrosarcoma of the ovary is extremely rare. It is usually unilateral, solid, irregular, pedunculated, and of variable size. The cut surface may present a variegated appearance, depending upon its cellularity and the tendency to hemorrhage, necrosis, and cystic degeneration.
Areas may be gray-white or pink-tan in color, sometimes suggesting raw pork. Histologically, it may resemble a cellular ﬁbroma or a solid, anaplastic carcinoma. It includes spindle, mixed, or round cell varieties, with irregular hyperchromatic nuclei and giant cells. The symptomatology is not distinctive. Torsion and ascites may occur. Extension may be by direct invasion or through vascular channels. If unilateral, encapsulated, and of low-grade malignancy, the prognosis following surgery is relatively good; otherwise it is poor.