Pseudomalignancies in Children: Histological Clues, and Pitfalls to Be Avoided

Abstract

The term “pseudomalignancy” covers a large, heterogenous group of diseases characterized by a benign cellular proliferation, hyperplasia, or infiltrate that resembles a true malignancy clinically or histologically. Here, we (i) provide a non-exhaustive review of several inflammatory skin diseases and benign skin proliferations that can mimic a malignant neoplasm in children, (ii) give pathologists some helpful clues to guide their diagnosis, and (iii) highlight pitfalls to be avoided. The observation of clinical–pathological correlations is often important in this situation and can sometimes be the only means (along with careful monitoring of the disease’s clinical course) of reaching a firm diagnosis.

Keywords

• pseudomalignancies
• pediatrics
• pseudolymphoma
• pityriasis lichenoides
• lymphomatoid papulosis
• mycosis fungoides