Positron emission tomography (PET) scan of a patient with Hodgkin’s lymphoma, nodular sclerosis, stage IIIB, prior to the start of chemotherapy (A).

PET after therapy (B) showed a complete normalization of the initially involved sites, but a new hot spot developed in the right groin (→). Correlation with clinical history revealed erysipelas of the right leg with probably inflammatory nodes in the groin. Repeat PET scan after antibiotics was completely normal. The patient remains in complete remission after a follow-up of 4 years.