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Table 2 Change of clinical stage by positron emission tomography/computed tomography PET/CT findings.

From: FDG-PET/CT imaging for staging and target volume delineation in conformal radiotherapy of anal carcinoma

Pre-PET TNM

Post-PET TNM

Tumor sites

T3N0 M0

T3N2 M0

Inguinal lymph node *

T3N0 M0

T3N2 M0

Inguinal * and external iliac lymph nodes

T3N0 M0

T3N2 M0

Inguinal *, external iliac, and perirectal lymph nodes

T3N0 M0

T3N0 M1

Multiple liver metastases

T3N3 M0

T3N3 M1

Single liver metastasis

  1. * confirmed by fine-needle ago-biopsy (FNAB)