CTCL Information

Cutaneous T-cell lymphomas (CTCLs) are a group of rare non-Hodgkin lymphomas that primarily affect the skin. They develop when T-lymphocytes (a type of white blood cell) become malignant and affect the skin.

The most common type of CTCL is mycosis fungoides (MF); Sézary syndrome (SS) is a rare, leukemic, erythrodermic variant. Other types include primary cutaneous anaplastic large cell lymphoma, lymphomatoid papulosis, and subcutaneous panniculitis-like T-cell lymphoma.

CTCL typically presents with persistent, scaly patches or plaques on the skin that may resemble eczema or psoriasis. Early diagnosis can be challenging due to this resemblance to common skin conditions.

Mycosis Fungoides

Mycosis fungoides typically progresses through several stages:

• Patch stage: Flat, scaly, red patches that may resemble eczema or psoriasis, commonly on sun-protected areas
• Plaque stage: Raised, firm lesions that may be itchy and can ulcerate
• Tumor stage: Solid, raised tumors that may ulcerate and become infected
• Erythrodermic stage: Widespread redness, scaling, and itching affecting most of the skin surface

Sézary Syndrome

Sézary syndrome is characterized by the triad of erythroderma (widespread red skin), lymphadenopathy (enlarged lymph nodes), and the presence of malignant T-cells in the blood (Sézary cells).

Common Symptoms

• Persistent, severe itching (pruritus)
• Dry, flaky skin (xerosis)
• Redness (erythema)
• Scaly patches or plaques
• Skin pain or soreness
• Thickened skin on palms and soles (hyperkeratosis)
• Hair loss in affected areas
• Nail changes

Diagnosing CTCL often requires a multidisciplinary approach and may take time due to its resemblance to other skin conditions. The diagnostic process typically includes:

Clinical Evaluation

• Detailed medical history, including duration and evolution of skin lesions
• Complete skin examination
• Lymph node palpation
• Assessment of treatment response to conventional therapies

Skin Biopsy

Multiple skin biopsies are often necessary, as early CTCL can be difficult to diagnose histologically. Biopsies should be taken from different lesions and from untreated areas.

Additional Testing

• Immunohistochemistry: To identify abnormal T-cell populations and their immunophenotype
• T-cell receptor gene rearrangement studies: To detect clonal T-cell populations
• Flow cytometry: For blood involvement assessment
• Imaging studies: CT, PET/CT, or MRI to assess for lymph node or visceral involvement
• Lymph node biopsy: If lymphadenopathy is present