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The frequency of occurrence of ano-perineal fistulas, especially in the context of inflammatory bowel diseases, makes them a subject of growing interest, mainly because of the discomfort and medico-social impact they induce in patients who carry them. Their treatment depends on their extent and potential for evolution. MRI appears as the technique of first choice for their assessment and follow-up. After a brief technical review, we'll look at the anatomy and imaging assessment of ano-perineal fistulas in terms of inflammatory activity and healing, two important characteristics that could influence both the prognosis and the therapeutic strategy.

Ectopic pancreas (EP) and pancreas divisum are well-known anatomical abnormalities of the pancreas. Although pancreas divisum is the most common birth defect of the pancreas, EP is not such a rare anomaly. It is defined as the presence of pancreatic tissue outside the pancreas with no anatomical connection to the orthotopic pancreas. We present the case of a patient who combined these two anomalies that were discovered by chance with an abdominal CT scan.

In the event of a prevascular mediastinal mass, knowledge of the anatomy and content of the mediastinum is an essential prerequisite to establish a differential diagnosis. The «4T» rule is applicable because it is a simple and effective mnemonic. It groups together; thyroid goiter, terrible lymphoma, teratoma and thymoma. The reference imaging technique is computed tomography with injection of iodinated contrast media, allowing the analysis of the lesion as well as its topography and its relationship with adjacent structures. Concerning the case of a lymphoma, PET/CT is the reference examination, as it allows a precise assessment of extension and can establish a target lesion for excisional biopsy which will make the definitive diagnosis. PET/CT is also used for therapeutic monitoring.

Portal cavernoma thrombosis is a complication of portal cavernoma. We describe the case of a 74-year-old patient who presented to the emergency department with abdominal pain. The computed tomography scan showed a mass from the head of the pancreas to the hepatic hilum not enhanced after injection of iodinated contrast. There was no dilatation of the bile ducts. Abdominal magnetic resonance ruled out a tumour and confirmed a portal cavernoma thrombosis. In 50 % of cases the etiology of the portal cavernoma is unknown. It is often asymptomatic. It may be discovered in case of complications of portal hypertension. In rare cases the portal cavernoma can compress the bile ducts. To our knowledge, portal cavernoma thrombosis has only been described in one article. It is important to search for a thrombophilic disorder when such a complication is found. We share this case report in order to raise awareness in the medical community about this rare complication.