<Li> Nodular basal cell carcinoma includes most of the remaining categories of basal - cell cancer . It is not unusual to encounter heterogeneous morphologic features within the same tumor . </Li> <P> The histopathologic classification includes: </P> <Ul> <Li> Nodular basal cell carcinoma (also known as "classic basal - cell carcinoma") most commonly occurs on the sun - exposed areas of the head and neck . </Li> <Li> Cystic basal cell carcinoma is morphologically characterized by dome - shaped, blue - gray cystic nodules . </Li> <Li> Cicatricial basal cell carcinoma (also known as "morpheaform basal cell carcinoma," and "morphoeic basal cell carcinoma") is an aggressive variant with a distinct clinical and histologic appearance . </Li> <Li> Infiltrative basal cell carcinoma is an aggressive type characterized by deep infiltration . </Li> <Li> Micronodular basal cell carcinoma is characterized by a micronodular growth pattern . </Li> <Li> Superficial basal cell carcinoma (also known as "superficial multicentric basal - cell carcinoma") occurs most commonly on the trunk and appears as an erythematous patch . </Li> <Li> Pigmented basal cell carcinoma exhibits increased melanization . About 80% of all basal - cell carcinoma in Chinese are pigmented while this subtype is uncommon in white people . </Li> <Li> Rodent ulcer (also known as a "Jacob's ulcer") is a large skin lesion of nodular basal - cell carcinoma with central necrosis . Almost all cancers can metastasize except glioma (maligancy of the central nervous system) and the rodent ulcer . </Li> <Li> Fibroepithelioma of Pinkus most commonly occurs on the lower back . </Li> <Li> Polypoid basal cell carcinoma is characterized by exophytic nodules (polyp - like structures) on the head and neck . </Li> <Li> Pore - like basal cell carcinoma resembles an enlarged pore or stellate pit . </Li> <Li> Aberrant basal cell carcinoma is characterized by the formation of basal - cell carcinoma in the absence of any apparent carcinogenic factor, occurring in odd sites such as the scrotum, vulva, perineum, nipple, and axilla . </Li> </Ul> <Li> Nodular basal cell carcinoma (also known as "classic basal - cell carcinoma") most commonly occurs on the sun - exposed areas of the head and neck . </Li>

Where is basal cell carcinomas most commonly found
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