Navigating the Shoals of Cutaneous T-cell Lymphoma: Challenges and Controversies

The session, led by Dr. Gina Chong at the University of Pennsylvania, addresses the complexities surrounding the diagnosis and management of Cutaneous T-cell Lymphoma (CTCL). Key topics include diagnostic challenges, especially for early-stage Mycosis Fungoides (MF), and the differentiation between CTCL and its mimickers. Dr. Chong emphasizes that biopsies can yield varied results even within the same patient, complicating the diagnostic process. Traditional diagnostic criteria can be hard to apply in practice, particularly in early cases lacking definitive lymphocyte clones. Advanced techniques like TCR (T cell receptor) sequencing enhance sensitivity and specificity for diagnosing CTCL but must be interpreted cautiously, especially concerning low clonal populations. The presentation also discusses clinical cases illustrating diagnostic dilemmas, including a patient with erythroderma found to have a clonal T cell population without the typical histological evidence of CTCL after further testing. Similarly, another case highlighted the risk of misdiagnosis regarding a patient with recurrent rashes, emphasizing how clinical correlation with histology is crucial for accurate diagnosis. The session concludes by advocating for careful interpretation of TCR results and reserving them for cases with a higher suspicion of CTCL to avoid unnecessary treatment.