Which histologic findings are characteristic of a partial hydatidiform mole?

Updated: Feb 16, 2018
  • Author: Lisa E Moore, MD, FACOG; Chief Editor: Warner K Huh, MD  more...
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Answer

In the incomplete or partial hydatidiform mole fetal tissue is often present, as well as amnion and fetal vessels with fetal red blood cells within the mesenchyme of the villi. Like in complete hydatidiform moles, hydropic (edematous) villi and trophoblastic proliferation are present. In addition, due to tangential sectioning, scalloping of the villi results in apparent trophoblastic inclusions within the mesenchyme of the villi. Paternally imprinted gene products (eg, p57, PHLDA2) are normally expressed only by maternal chromosomes. In the absence of maternal chromosomes, as is the case in complete moles, the nuclei of the villous stroma and the cytotrophoblasts do not stain for p57 or PHLDA2 (Pleckstrin homology-like domain, family A, member 2). In contrast, these cells are positive for p57 and PHLDA2 in partial moles (which are triploid) and missed abortion with hydropic degeneration (which are diploid). [39, 40, 41]


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