Episacroiliac lipoma.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001415:Back; D001416:Back Pain / Q000175:diagnosis / Q000209:etiology; D003937:Diagnosis, Differential; D005260:Female; D006547:Hernia / Q000150:complications / Q000175:diagnosis; D059685:Herniorrhaphy; D006801:Humans; D008067:Lipoma / Q000175:diagnosis / Q000601:surgery; D008297:Male; D008875:Middle Aged