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A Rare Case of Cutaneous Diffuse Large B-cell Lymphoma Presenting as a Chronic "Infectious" Skin Ulcer.

Cutaneous diffuse large B-cell lymphoma (DLBCL) usually manifests as papules, nodules, or plaques. A rare case of a patient with a chronic skin ulcer and signs and symptoms of infection, including fever and large amounts of yellow wound exudate, is presented. Fifteen (15) months before diagnosis, a 43-year-old otherwise healthy man noted soreness without apparent cause in his upper chest and a palpable 2 cm x 2 cm focal lump. The patient developed frequent fevers, and the lump enlarged over time, producing purulent exudate. For 14 months, the patient was examined and treated at 5 hospitals, but biopsies, smears, cultures, and various types of nucleic acid testing were negative. Antibiotics to treat the suspected but nonclassified infection were ineffective. Ultimately, debridement and pathological examination of necrotic tissue from the deep sinus revealed DLBCL. The patient was provided chemotherapy, surgical debridement, and negative pressure wound therapy. Wounds started to reduce in size once chemotherapy was initiated. The wound was surgically closed with a split-skin graft, and the patient was discharged 93 days following admission to the authors' facility. This case illustrates the possibility of cutaneous DLBCL in patients with chronic skin ulcers and infectious manifestation that do not respond to antibiotic therapy. Prompt deep tissue debridement and pathological examination of deep tissue will help confirm the presence of cutaneous DLBCL and guide required chemotherapy.