Mesonephric duct hyperplasia of the uterus. Report of two cases and three other cases of mesonephric duct remnant with findings of mucin histochemistry and lectin binding immunohistochemistry.

Two cases of mesonephric duct hyperplasia of the uterus, together with three cases of uterine mesonephric duct remnant, are reported. The latter cases were identified by serial transverse sectioning of 42 surgically resected uteri, yielding a frequency of approximately 7%. Histochemical studies showed no mucin in the cytoplasm of cells lining the mesonephric duct remnant, as well as mesonephric duct hyperplasia. In contrast, the endocervical epithelium had abundant neutral mucin, sialomucin and sulfomucin. Immunohistochemical studies on lectin binding showed positive binding of PNA and SBA lectins only to the lining cells of mesonephric duct hyperplasia.