C4A.122

Clinical Causes: Exposure to ultraviolet (UV) radiation from sunlight or tanning beds Weakened immune system, such as in organ transplant recipients or individuals with certain immune disorders Older age, as risk increases with age Previous history of skin cancers Fair skin complexion, which is more susceptible to UV damage Potential genetic factors that may predispose individuals to MCC

Key Symptoms: Fast-growing, firm, and painless skin nodules Smooth, shiny, or bluish-red appearance of the lesion Lesion located on the eyelid, especially the lower eyelid, near the canthus Lesion that may ulcerate or bleed over time Possible swelling or tenderness around the affected area In some cases, the lesion may be mistaken for benign skin growths initially

Diagnosis Path: Diagnosing Merkel cell carcinoma involves a combination of clinical evaluation and laboratory tests. A dermatologist or ophthalmologist may perform a physical examination of the lesion, noting its size, appearance, and growth rate. Confirmatory diagnosis usually requires a biopsy, where a sample of the lesion tissue is examined under a microscope to identify cancerous Merkel cells. In addition, imaging studies such as MRI, CT scans, or PET scans may be utilized to determine if the cancer has spread beyond the primary site and to plan appropriate treatment strategies.

Treatment Protocols: Treatment approaches for Merkel cell carcinoma of the eyelid aim to remove the tumor completely and prevent recurrence or spread. These can include: - Surgical excision: Removing the tumor along with some surrounding healthy tissue to ensure complete removal. - Mohs micrographic surgery: A precise surgical method that involves removing and examining thin layers of tissue until no cancer cells remain. - Radiation therapy: Used post-surgery to target residual cancer cells or as a primary treatment if surgery isn’t suitable. - Chemotherapy: Systemic treatment may be considered if the cancer has metastasized. - Immunotherapy: Recent advancements include immune checkpoint inhibitors that help the body's immune system fight the cancer. Management plans are individualized based on the tumor's size, location, spread, and the patient's overall health.