Abdominal Actinomycosis Abscess Presenting as an Isolated Gastrointestinal Pseudotumor

Abstract

Actinomyces is a gram-positive anaerobic bacterium that is ubiquitous in nature. It typically presents as respiratory, cervicofacial, or abdominopelvic abscesses. We present a 66-year-old man with a progressive enlarging abdominal wall nodule concerning for malignancy. The patient had a negative workup, including an ultrasound-guided fine-needle aspiration and colonoscopy, with biopsy for a possible extension to the colonic wall. Diagnosis of an Actinomyces abscess was obtained through surgical resection with right hemicolectomy. He was successfully treated with a prolonged course of intravenous antibiotics. This is a rare case of an isolated abdominal wall Actinomyces abscess mimicking a gastrointestinal malignancy.

Diffuse Large B Cell Lymphoma Raising Suspicion for an Infection: A Case Report

“…Following multiple non-diagnostic biopsy attempts, with a liver mass found on imaging, and ERCP findings of biliary dilation and pus in the biliary tract, the patient was discharged with a presumed diagnosis of hepatobiliary actinomycosis based on previous case reports that had depicted similar characteristics that mimic hepatobiliary cancer [8]. Actinomyces, a Gram-positive anaerobic bacteria, represents a rare cause of abdominopelvic abscesses [9]. The postulation of the sequence of events was as follows: a biliary stricture that resulted in chronic stasis followed by the formation of hepatic abscess/ascending cholangitis.…”

Abdominopelvic Actinomycosis—The Diagnostic and Therapeutic Challenge of the Most Misdiagnosed Disease

“…In Table 2 , we present several publications with cases and the problems of diagnosis and treatment that involve abdominopelvic actinomycosis, problems that have been encountered in our cases as well [ 8 , 14 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”