Subacute or chronic inflammation of the umbilical cord associated with high perinatal mortality.
Treponema pallidum, herpes simplex virus, other organisms with low virulence such as Mycoplasma are also suspected.
Thickened whitish umbilical vessels resembling macaroni.
Necrotizing basophilic exudate accumulates in concentric perivascular rings or crescents. The exudate may become calcified.