Unusual Sternoclavicular Joint Infection With Pseudomonas in a Young Adult With Hidradenitis Suppurativa: A Case Report

Sternoclavicular joint infection is a relatively rare and serious condition, and its association with <i>Pseudomonas aeruginosa</i> is uncommon. Moreover, hidradenitis suppurativa is a chronic inflammatory skin disease that may predispose patients to deep-seated infections, as illustrated by this unusual report. We present a case of a 31-year-old male patient with a <i>Pseudomonas aeruginosa</i> sternoclavicular joint infection. The subject presented for a three-month history of swollen, erythematous, and tender right sternoclavicular joint, refractory to non-steroidal anti-inflammatory drugs (NSAIDs) and steroid injections. As past medical history, the patient has hidradenitis suppurativa that was quiescent at the time of presentation. MRI of the right shoulder showed findings suggestive of osteomyelitis and cellulitis. Soft tissue culture showed a <i>Pseudomonas aeruginosa</i> infection, and blood cultures yielded no growth. He showed clinical improvement and normalization of inflammatory markers with intravenous ceftazidime for two weeks, and he was discharged home on oral ciprofloxacin for four weeks. In this context, we underscore the need to consider uncommon pathogens in atypical infection sites.