The authors report the case of an osteoid osteoma of the acetabular roof in a 17-year-old sportsgirl successfully treated by radiofrequency ablation, with a mid-term evidence of cartilage loss. Extra-articular access and exact positioning of the needle electrode exclude direct operative chondral damage. Intense physical activity could be an aggravating factor for the chondropathy. It is difficult to determine whether the acetabular cartilage joint was damaged only by thermo-ablation or if it had also been weakened before by the O.O. The authors caution practitioners from using this technique for para-articular lesions, especially near weight-bearing joints.Key-word: Osteoid osteoma -Articular cartilage damage -Radiofrequency -Thermo-ablation.From: 1. Department of Radiology, Clinique St-Pierre, Ottignies, Belgium.

Melanotic schwannomas are rare nerve sheath tumors that differentiate themselves from classical schwannomas by harboring melanin-producing cells. Intracranial localizations are uncommon, especially on the Gasserian ganglion. We performed a literature review, presenting imaging characteristics, differential diagnosis, and immunohistochemical features for identification. These tumors carry the risk of recurrence and metastases. The prognosis is uncertain. We discuss recommendations for diagnosis and treatment.

Infectious aneurysms are almost invariably of bacterial origin. It is a rare life-threatening disease, with a mortality reaching 67% in the absence of an early treatment (1), due to hemorrhage and uncontrolled sepsis.Clinical and biological findings are not specific and the diagnostic is often delayed. In the presence of fever and sepsis, CT is the imaging method of choice as several features may indicate the infectious origin and distinguish from atherosclerotic aneurysms. Case reportA 55-year-old woman was admitted in our institution because of fever and abdominal pain.Upon admission, she presented with tachycardia (110 bpm) and slightly decreased blood pressure (110/70 mmHg). Infection of the lower urinary tract was suspected at first. Blood tests showed an important inflammatory syndrome with increased C-reactive protein (CRP) levels (34 mg/dL, normal: < 1 mg/dL). However, urine analysis did not disclose any abnormal findings. A CT-scan of the whole abdomen was performed (Fig. 1).CT revealed an important infiltration of the retroperitoneal fat surrounding the distal part of the abdominal aorta as well as the proximal portion of the right iliac artery. The density of the infiltrated fat was evaluated at 20 HU, which was hardly compatible with blood. The infiltration also involved the pelvic retroperitoneal space. After contrast artery and measured 44 x 31 mm in axial view. Based on these clinical and radiological findings, the diagnosis of infected aneurysm of the right iliac artery was rendered. The patient was surgically treated 3 days after admission. She is alive and doing well 2 years after the operation. injection (Fig. 2), CT demonstrated a large aneurysm that was located in the proximal part of the right iliac JBR-BTR, 2012, 95: 350-354. MYCOTIC ANEURYSM OF THE RIGHT ILIAC ARTERY: IMAGING DIAGNOSIS AND CORRELATION WITH PATHOLOGICAL FINDINGSG

Teaching Point: Retropharyngeal hematoma appearing under rivaroxaban is uncommon but should be suspected in cases of dysphagia, dysphonia or breathing difficulties.

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