Background:Primary psoas abscess is an unusual clinical entity rarely encountered in the postpartum period. Only seven cases have been reported to date. Here, we present a woman with a primary psoas abscess caused by Mycobacterium tuberculosis and occurred 2 months following a normal vaginal birth. We highlight the difficulties in the management of this uncommon condition in light of the relevant literature.Case Description:A 34-year-old woman who was previously healthy was presented at 2 months’ postpartum with important right sciatica and low back pain without fever. Examination of the abdomen revealed tenderness in the right iliac fossa but obstetric/gynecologic and neurologic examinations were normal. The patient had an elevated C-reactive protein level and computed tomography (CT)-scan demonstrated a large psoas abscess on the right side without sacroiliac or spine abnormalities. Initial posterior lumbar percutaneous drainage was useful, but no pathogens were identified. The patient was discharged home with oral antibiotics therapy (amoxicillin/clavulanate and metronidazole). Four weeks later, the follow-up CT-scan showed a re-accumulation of the abscess cavity. Subsequently, the patient underwent a right anterolateral laparotomy with a retroperitoneal approach for abscess drainage. Again, no microorganisms were found. However, diagnosis of tuberculosis was established on histopathologic study. She was successfully treated with antituberculous drugs with a good outcome.Conclusions:Most primary psoas abscesses present with a delay in diagnosis because of the rarity of this infectious disease, the lack of specific symptoms and signs, and its similarity to many differential diagnoses. When suspected, CT-scan and/or magnetic resonance imaging help in making an accurate diagnosis and facilitate percutaneous or open surgical drainage of the abscess. Correct and fast identification of the microorganisms in addition to appropriate usage of antibiotic regimen improves the outcome.

Background Actinomycosis is a rare chronic infection caused by Actinomyces. The abdominopelvic localization of this pathology makes preoperative diagnosis extremely exceptional. The following report is the case of a patient treated for adenocarcinoma of the middle rectum associated with mesorectal actinomycosis. The diagnosis of actinomycosis was made postoperatively. Case presentation A 69-year-old Caucasian male patient was admitted for rectal bleeding. Clinical and paraclinical assessment revealed a middle rectum adenocarcinoma with local extension in the mesorectum. The patient underwent an anterior resection of the rectum by laparotomy after neoadjuvant chemoradiotherapy. Postoperative follow-up was simple. Pathological study of the specimen noted complete sterilization of the rectal adenocarcinoma and the presence of large foci of suppurative necrosis containing actinomycotic grains in the mesorectum. Conclusion Abdominopelvic actinomycosis is a rare pathology and has therefore rarely been dealt with. This issue can lead to unnecessary and mutilating surgery. We report an exceptional coincidence of rectal adenocarcinoma and mesorectal actinomycosis mistaken for mesorectal extension of the cancer.