Clinically Relevant Updates in Dermatopathology

The presentation covers clinically relevant updates in dermatopathology, focusing on ambiguous diagnoses often encountered in path reports, which can complicate patient counseling and treatment decisions. Key points include distinguishing between psoriasiform and spongiotic dermatitis, with updates on the role of eosinophils and Langerhans cell microvesiculations in diagnosing eczema versus psoriasis. The author discusses a new immunohistochemical marker, Illinois 36, to aid the diagnosis of psoriasis. Additionally, systemic malignancies and autoimmune conditions related to dermal hypersensitivity reactions are highlighted, along with the importance of recognizing IgG4-driven diseases. Updates on interface dermatitis emphasize the significance of specific inflammatory cells, particularly eosinophils in diagnosis. The presentation also delves into the challenges of diagnosing atypical intraepidermal lymphoid infiltrates and discusses the utility of TCR gene sequencing and TRBC1 immunohistochemistry. There’s mention of PRAM for borderline lesions and P-16 as a surrogate marker to help assess atypical squamous proliferations, which are analyzed through P53 immunohistochemistry to differentiate between benign and malignant lesions. Overall, these updates underscore the evolving landscape of dermatopathology, aiming to enhance diagnostic accuracy and clinical outcomes.