Hoagland's Sign as a Manifestation of Parvovirus B19 Infection

Parvovirus B19 infection typically exhibits a biphasic clinical course with varied symptoms. While facial or extremity edemas are common in adult cases, localized eyelid swelling, referred to as Hoagland's sign, had not been recognized as a potential clinical feature. Here, we present the case of a 72-year-old woman with parvovirus B19 infection and Hoagland's sign, characterized by drooping of the swollen upper eyelid and narrowing of the ocular aperture. The patient showed symptoms of fever, myalgia, and neutrophilia with atypical lymphocytes. The diagnosis was confirmed through elevated parvovirus B19 IgM antibody levels. This is the first reported case of parvovirus B19 infection presenting with Hoagland's sign. Parvovirus B19 infection can present with the condition called "infectious mononucleosis-like syndrome" (IML), which mimics classical manifestations of infectious mononucleosis (IM), including Hoagland's sign. Our case suggested that Hoagland's sign may be one of the characteristic symptoms of the second phase in the biphasic course of parvovirus B19 infection. It is important to consider the possibility of parvovirus B19 infection, especially in elderly patients presenting with Hoagland's sign.