We report a case of olecranon bursitis due to Mycobacterium goodii in a 60-year-old man. Prior to recognition of his infection, he received intrabursal steroids and underwent olecranon bursectomy. His infection was cured with antimicrobial therapy consisting of doxycycline and ciprofloxacin. This case illustrates that previously unrecognized members of the Mycobacterium smegmatis group of mycobacteria have pathogenic potential.
CASE REPORTIn January 1999, a 60-year-old man with a history of hypertension, osteoarthritis, type II diabetes mellitus, and benign monoclonal gemmopathy developed bursitis of his right olecranon without an obvious predisposing cause. Initial treatment included intrabursal steroid injections and a short empiric course of ciprofloxacin. Pain and swelling persisted, and a right olecranon bursectomy was performed on 26 July 1999. A Gram stain of a specimen of tissue from the operation showed rare white blood cells but no organisms; pathologic examination of the same tissue revealed fibroadipose tissue with acute and chronic inflammation and occasional multinucleate giant cells.Postoperation the patient developed persistent purulent drainage from his wound with associated erythema in the incisional margins. Five weeks postoperation, fluid had reaccumulated in his bursal sac and an aspirate was performed. A Gram stain of the aspirated fluid once again revealed white blood cells but no organisms. However, a smear for acid-fast bacilli revealed organisms consistent with mycobacteria. Concurrently, final results for the operative specimen analyzed by the University of Texas by a PCR technique showed that the causative organism was Mycobacterium goodii. Bacterial culture of the operative specimen revealed gram-positive and acid-fast organisms that grew on sheep blood agar. After subculture onto Middlebrook media, growth of smooth nonpigmented colonies was noted within 3 days. This rapidly growing mycobacterium was sent to the University of Texas at Tyler for identification and susceptibility testing.The second bursal aspirate, in addition to a third bursal aspirate 8 weeks postoperation, yielded M. goodii on culture.On 15 September 1999, therapy with doxycycline (100 mg orally twice daily) and ciprofloxacin (500 mg orally twice daily) was commenced. Within 1 week of starting this therapy, the volume of daily drainage from the incision decreased. After 6 weeks of therapy, a follow-up examination showed no residual swelling, induration, or wound drainage. Therapy was continued through 2 December 1999. The patient remained free of all clinical signs of infection through 15 February 2000.Drug susceptibility testing (performed by Richard Wallace at the University of Texas Health Center in Tyler) revealed that the isolate was sensitive in vitro to amikacin, ciprofloxacin, doxycycline, imipenem, kanamycin, minocycline, ofloxacin, sulfamethoxazole, sulfisoxazole, tobramycin, and polymyxin B. The organism was intermediately susceptible to cefoxitin and resistant to clarithromycin.M. goodii was recognized a...