PMC4189054_01
Right ovarian solid mass.
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Transvaginal ultrasonography revealed a right adnexial mass 38.9 mm x 36 mm in diameter that showed a homogeneously isoechoic pattern (Fig. 1).
Fascicles of smooth muscle cells (H&E, x100).
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Pathologic examination revealed a tumour composed of interlacing bundles of fusiform cells, resembling a leiomyoma (Fig. 2).
The smooth muscle cells are uniformly spindle shaped or elongated with blunt-ended or cigar-shaped nuclei. Mitotic activity is absent or very low, and cellular and nuclear pleomorphisms are absent.
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There was no atypia or pleomorphism, and mitotic count and necrosis were absent (Fig. 3).
Marked immunoreactivity for smooth muscle actin (x200).
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Immunohistochemical staining showed strong and diffuse positive staining for smooth muscle actin (SMA) (Fig. 4).
Very low Ki-67 proliferation index (x400).
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Ki-67 proliferation index was low (Fig. 5).