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An indurated right arm mass in a patient treated for locally advanced prostate cancer

An 83-year-old man was admitted to our department for treatment of a purplish-blue and indurated mass measuring 6 cm 9 2 cm on the posterior external side of the right arm. The patient’s primary medical history was an adenocarcinoma of the prostate with a Gleason score of 10 that spread to the adipose tissue near the prostate on all the biopsies. Since November 2017, he has been treated with an intramuscular injection of extended release leuprorelin acetate 30 mg every 6 months. In July 2018, a subcutaneous injection of leuprorelin acetate in the right arm led to complications after several days with the appearance of a mass at the injection site (Fig. 1). The initial clinical appearance suggested a bacterial abscess, and two courses of antibiotic treatment using pristinamycin and then amoxicillin were introduced with no effect. A surgical incision was also made without any further success.