[Actinomycosis of the buttock].
BACKGROUND
Cutaneous actinomycosis of the buttocks is a rare granulomatous bacterial infection that usually starts in the perianal area. We present an exceptional case in the form of a pseudo-tumor.


METHODS
A 69 year-old woman, in general good health, developed an indurate mass on the supra-external quadrant of the right buttock. The tumor was centered by an ulcerated nodule with a diameter of around 10 centimeters. Imaging showed invasion of the soft tissue of the skin in the internal psoas muscle, the adipose tonality of which was compatible with a liposarcoma. The skin biopsy revealed characteristic bacterial grain in the center of a cholesterol granuloma. Subsequent culture in aerobic milieu identified Actinomyces gerencseriae. Cure was obtained following complete exeresis of the fibrous tissue and 8 months of antibiotic amoxicillin-clavulanic acid therapy.


CONCLUSIONS
Other than the most unusual clinical aspect, the originality of this case of actinomycosis of the buttocks is based on its potential appendix origin, 4 years after acute appendicitis, with slow posterior fistulation. Other cases of actinomycosis of appendix origin have been reported and its delayed onset following the intervention has been documented. The pseudo-sarcomatous aspect was responsible for diagnostic wandering. The histological image and, subsequently, the results of the bacteriological culture confirmed the diagnosis.
Maradeix
S
S
Clinique Dermatologique, des Hôpitaux Universitaires de Strasbourg.
Scrivener
Y
Y
Grosshans
E
E
Sabatier
X
X
Riegel
P
P
Cribier
B
B
D000190:Actinomyces / Q000302:isolation & purification / Q000472:pathogenicity*; D000196:Actinomycosis / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D000368:Aged; D019980:Amoxicillin-Potassium Clavulanate Combination / Q000627:therapeutic use; D001706:Biopsy; D002081:Buttocks / Q000382:microbiology / Q000473:pathology; D004359:Drug Therapy, Combination / Q000627:therapeutic use; D005260:Female; D006801:Humans
D019980:Amoxicillin-Potassium Clavulanate Combination