Inflammatory Pseudotumor of the Mesentery.

Teaching point: An inflammatory pseudotumor can occur almost everywhere in the body and has nonspecific imaging findings.

Endovascular management of an isolated dissection of the celiac artery following a blunt deceleration-type trauma.

A 29-year-old, otherwise healthy male was brought to the emergency department after suffering an injury from falling from the roof of his house. Whole-body computed tomography (CT) showed a small ostial dissection of the celiac artery (CA) associated with a pseudoaneurysm, thrombosis, and retroperitoneal periaortic hematoma. The celiac trunk was otherwise normal with good distal patency and no signs of intestinal ischemia. The patient was successfully managed via an endovascular approach with the placement of a covered stent in the CA.

Trichobezoar.

Teaching point: A trichobezoar is a relatively rare entity that presents on imaging as a heterogeneous and multilayered mass molded by the stomach lumen.

Bilateral pulmonary sequestration complicated with a bibasal pneumonia in an adult patient.

Pulmonary sequestrations (PS) are rare congenital pulmonary malformations, characterized by non-functioning and dysplastic pulmonary tissue, without a normal connection to the tracheobronchial tree and supplied by the systemic arterial circulation. PS typically occur in the lower lobes and the radiologist should consider the possibility of a PS in a patient with persistent or recurrent pneumonia in the lower lobes, especially in children. We hereby present a rare case of bilateral intralobar PS complicated with bilateral pneumonia, in a previously healthy 37-year-old male patient, who was referred to the emergency department by his general practitioner because of persisting dyspnea and fever. The hospital stay was complicated with central nervous aspergillosis due to septic emboli.

Retroperitoneal fibrosis: A rare mimicker of a perirenal hematoma.

Retroperitoneal fibrosis (RPF) is a relatively rare entity, characterized by chronic inflammation and fibrosis in the retroperitoneal periaortic tissues. Due to this rarity, the diagnosis might be delayed or challenging, especially with atypical presentations of RPF. We report the imaging findings of an incidental finding of active RPF in an asymptomatic 84-year-old male patient. This patient was initially diagnosed with a perirenal hematoma due to an atypical imaging presentation on a routine staging computed tomography scan of the chest and the abdomen to stage a recently discovered prostate cancer. However, due to the persistence of the perirenal lesion, subsequent magnetic resonance imaging of this lesion was conducted, which resulted in the final diagnosis of active RPF. With this case report, we want to address attention to the potential atypical presentation of RPF, which could mimic a perirenal mass and demonstrates the importance of a broad differential diagnosis. Secondly, we want to point out the importance of magnetic resonance imaging in the evaluation of RPF, since it can differentiate between inactive or chronic idiopathic RPF and active idiopathic RPF or malignant RPF. Finally, this case shows the importance of comparing current imaging findings with previous imaging results, since a perirenal hematoma would reduce in size on follow-up imaging, which was not the case in our patient.