Staging of Squamous Cell Carcinoma of the Foot

Critical Staging Requirements

The presence of inguinofemoral lymphadenopathy does not automatically confirm metastatic disease, and ultrasound-guided fine needle aspiration (FNA) of the enlarged inguinal lymph nodes must be performed to determine if the lymphadenopathy represents metastatic SCC, as recommended by the British Journal of Dermatology 1, 2
If FNA is inconclusive despite repeated attempts, surgical biopsy is required to confirm nodal involvement 1, 2

The tumor is classified as Stage III (T2N1M0 or higher) based on the primary tumor size and confirmed regional lymph node involvement, according to the National Comprehensive Cancer Network 3, 4, 5
Regional lymph node involvement automatically elevates staging to at least Stage III regardless of primary tumor characteristics, as stated by the National Comprehensive Cancer Network 4, 5

Comprehensive staging must include FDG-PET with CT scanning to evaluate for systemic and lymph node metastases (preferred modality), as recommended by the British Journal of Dermatology 1, 2
If PET is unavailable, CT or MRI of chest, abdomen, and pelvis can be used to identify systemic or additional lymph node metastases 1, 2
MRI of the foot is necessary to assess tumor extent and involvement of underlying structures (tendons, nerves, vessels, bone) given the anatomically complex location, as suggested by the British Journal of Dermatology and Praxis Medical Insights 1, 2, 3

Clinically palpable lymph nodes should not be assumed to be metastatic without pathologic confirmation, as reactive lymphadenopathy is common and can mimic metastatic disease, according to the British Journal of Dermatology 1, 2
Up to 25% of clinically negative lymph nodes may harbor micrometastases, emphasizing the critical importance of appropriate nodal evaluation, as noted by Praxis Medical Insights 6