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16 Basal Cell Carcinoma

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a

b

Fig. 16.7 Pigmented BCC: Basaloid neoplasm with areas of

 

 

melanin pigment deposistion. Courtesy of Dr. Evangelos Badiavas

has experienced paresthesias, pain, numbness, or paresis in the vicinity of suspicious BCCs. These symptoms could suggest perineural invasion. On horizontal frozen sections, perineural invasion is exemplified by basophilic basaloid cells wrapping around the nerve.

BCCs are typically stromal dependent, which is thought to be one of the reasons behind why BCCs do not usually metastasize. Incisions to the level of the adipose tissue are usually sufficient; however, occa-

c sionally, BCCs create their own stroma as they invade into underlying structures. More aggressive BCCs such as infiltrating, micronodular, and morpheaform have been known to use the already laid down stoma and invade into fascia, muscle, cartilage, and even bone. It has also been reported that BCCs without peripheral palisading tend to be more aggressive [22].

Fig. 16.6 (a) Clear cell basal cell carcinoma: areas of typical appearing basal cell carcinoma with several nests exhibiting marked clear cell features. (b) Some nests contain both typical and clear cell features that are sharply demarcated. (c) Clear cells with nuclei at the periphery of the cell with central clear to bluish expanded cytoplasm that is not lobulated such as in sebaceous cells. Courtesy of Dr. Evangelos Badiavas

Summary: Non-cancerous Conditions That May Be Histologically Similar to BCC

Several benign conditions can simulate BCC, notably hair follicles, inflamed adnexal structures, and endothelial cells.

16.4Non-cancerous Conditions That May Be Histologically Similar to BCC

occur, the trigeminal and facial nerve branches are the most commonly involved [21]. Prior to the Mohs procedure, the surgeon should ascertain whether the patient

The frozen horizontal sections containing normal epidermis and adnexal structures can actually resemble BCC. Significant experience needs to be gained in