Mycobacterium malmoense was first described in 1977 and today is second only to the Mycobacterium avium complex as a cause of atypical mycobacterial infection in Sweden. We retrospectively studied the records of 221 patients from whom M. malmoense was isolated during 1968-1989. M. malmoense was recovered from the respiratory tract of 171 patients (170 adults and one child) and from cervical lymph nodes of 36 patients (35 children and one adult). In addition, the organism was isolated from the urine of six patients, one of whom had disseminated disease and two of whom had abscesses caused by M. malmoense. A majority of the patients with pulmonary infection as well as the patient with disseminated disease had other underlying diseases.
In 76 patients with conduit urinary diversion, the skin in the stomal area was studied with regard to complications. No such complications had occurred in 39 cases. Superficial erosive dermatitis was present or had been a transient episode in 27 cases. The immediate peristomal area was found in ten cases to show a different type of complication. This was characterized by hyperplastic, papillomatous skin lesions of a chronic nature. A rubber urinary collecting device for long-term use had been fitted in nine of the ten patients, and none of them had a protruding nipple stoma. The clinical, microbiologic and histologic features of these hyperplastic lesions are described and aetiologic factors are discussed. Change to another type of collecting device was followed within three to six weeks by healing of the lesions.
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