Tuberculosis Presenting as Cutaneous Erythema Nodosum on 18F-FDG PET/CT.

The present article presented a 47-year-old woman with areas of nodular swelling and discoloration involving bilateral lower limbs since 12 months. Biopsy from skin lesions revealed erythema nodosum. As erythema nodosum can be secondary to multiple etiologies, whole-body F-FDG PET/CT was performed to assess the disease distribution and guide the site of biopsy. F-FDG PET/CT revealed metabolically active mediastinal lymphadenopathy in addition to the skin lesions. Endobronchial ultrasound-guided biopsy from subcarinal lymph node revealed tuberculosis.