Trikilemmal Karsinom
Özet
Trikilemmal karsinom, kıl follikülünün dış kök kılıfından kaynaklanan ve oldukça nadir görülen malign bir deri eki tümörüdür. Genellikle yetmişli ve doksanlı yaşlardaki bireylerde, saçlı deri, yüz ve boyun gibi güneş ışığına kronik olarak maruz kalan anatomik bölgelerde yavaş büyüyen, sıklıkla ülserleşen papül veya nodül şeklinde klinik prezentasyon gösterir. Etiyolojisinde ultraviyole ışınları, aktinik hasar, immünsupresyon ve p53 tümör supresör gen mutasyonları gibi faktörler rol oynamaktadır. Histopatolojik olarak, periferik palizatlanma ve hyalin bazal membran ile çevrili, sitolojik atipi ve belirgin mitotik aktivite gösteren glikojenize berrak hücrelerden oluşan lobüler bir büyüme paterni sergiler. Ayırıcı tanısında berrak hücreli skuamöz hücreli karsinom, bazal hücreli karsinom ve sebase karsinom gibi diğer berrak hücreli kutanöz tümörler yer alır; net ayrım için CD34 ve p53 gibi immünhistokimyasal belirteçlerden yararlanılır. Genel olarak iyi prognozlu bir neoplazm olup, lokal nüks ve uzak metastaz gelişimi oldukça nadirdir. Tedavisinde temiz cerrahi sınırlar içeren konservatif lokal eksizyon standart ve küratif yaklaşım olarak kabul edilirken, nüks veya cerrahi sınırın korunamadığı durumlarda Mohs mikrografik cerrahisi tercih edilmektedir.
Trichilemmal carcinoma is a highly rare malignant cutaneous adnexal neoplasm originating from the outer root sheath of the hair follicle. It typically presents in elderly patients during their seventh to ninth decades as a slow-growing, frequently ulcerated papule or nodule on sun-exposed anatomical sites such as the scalp, face, and neck. Chronic actinic damage, ultraviolet radiation, immunosuppression, and mutations in the p53 tumor suppressor gene are implicated in its poorly understood etiology. Histopathologically, the tumor is characterized by an invasive lobular growth pattern composed of cytologically atypical clear cells containing abundant glycogen, often demonstrating peripheral palisading and prominent hyaline basement membranes. The differential diagnosis includes other cutaneous malignancies with clear cell features, such as squamous cell carcinoma, basal cell carcinoma, and sebaceous carcinoma; immunohistochemical markers like CD34 and p53 are critical for accurate differentiation. Despite its cytologically malignant appearance, it generally follows an indolent clinical course with a low incidence of local recurrence and distant metastasis. Complete conservative surgical excision with clear margins remains the primary curative treatment, while Mohs micrographic surgery is highly recommended for recurrent lesions to ensure maximal tissue preservation.
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