pN2a: Metastasis in single ipsilateral lymph node, > 3 cm to < 6 cm in greatest dimension
This is a small invasive squamous cell carcinoma (SCC) arising on the forehead of an adult female. The tumor is less than 2 cm in greatest dimension and did not have any high-grade features histologically, consistent with a T1 tumor.
This is an example of a small, superficially invasive, well- to moderately differentiated SCC (T1). Note the enlarged, hyperchromatic staining nuclei with focal spindling and scattered mitoses
.
Squamous carcinoma in situ (Bowen disease) shows growth limited to the epidermis (Tis).
Invasive SCC shows superficial invasion into the dermis
. This is a tumor ≤ 2 cm in greatest dimension with < 2 high-risk features (T1).
A tumor > 2 cm in greatest dimension ± 1 additional high-risk feature or any size with ≥ 2 high-risk features is staged as T2.
; excision confirmed an invasive SCC of > 2 cm in greatest dimension (T2).
