Figure 1.
(A) Squamous cell carcinoma with perinodal extension into fat (4X magnification). (B) Cross section through the CT portion of the PET/CT prior to the initiation of immunotherapy. The largest lymph node measures 5.6 x 4.3 cm transverse (arrows). (C) Noncontrast CT of the pelvis obtained approximately 1 month after initiation of immunotherapy reveals decreasing lesion size (arrowheads) now measuring 4.2 x 3.8 cm (arrowheads). Subsequent contrast enhanced CTs at 3 months (D) and 36 months (E) after initiation of immunotherapy show no evidence of residual nodal disease.