Takayasu's arteritis exposes to complications of varying severity, such as arterial stenosis, thrombosis, and more rarely aneurysms. Aortic dissection is a rare complication of Takayasu's disease, reported in few times in the literature, only 7 of which concern the abdominal aorta. We report the case of a 41-year-old woman followed for Takayasu disease for 15 years, who presented an asymptomatic and chronic dissection of the abdominal subrenal aorta. The patient underwent conservative medical treatment. After a follow-up of 17 months, the aortic dissection was still asymptomatic, with a stable appearance on follow-up imaging. To our knowledge, this is the first case report of asymptomatic aortic dissection as a rare complication of Takayasu disease.

Introduction:Chordoma is an extremely rare malignant bone tumor that mainly affects the sacrococcygeal and spheno-occipital regions. Localization in the spine is exceptional and occurs mainly in young individuals.Case Report: We report the case of a 32-year-old male patient with a chondroid chordoma in the dorsal spine which is a very rare histological subtype of chordoma. Conclusion:The chondroid chordoma is an uncommon malignant bone tumor. An intrathoracic chordoma manifesting as a posterior mediastinal tumor is unusual, it appears especially in young individuals. The imaging helps to allow a better characterization of the tumor.

Mounier-Kuhn syndrome (MKS) is a rare entitycharacterised by an enlargedtrachea and main bronchi.Despite the century-long delaybetween the first description in 1932, itisstillunder-diagnosedwithonly 300 cases reported in the literature. Histologicallyitischaracterised by an atrophy of the smooth muscle and elastic fibres of the tracheobronchialtreeresulting in impairedmucociliary clearance. The respiratorysymptoms of MKS are non-specific and appear as a recurrentrespiratory infection. Chest CT remains the gold standard for diagnosistreatmentis non-specific and based on the control of associatedrespiratorydiseases, physiotherapy and sometimessurgery. We report here the case of a 61-year-old man with a history of chronicbronchitis and recurrentpneumonitiswhowasadmitted for acute dyspnea and in whom the diagnosis of MKSwasretained. A betterknowledge of the pathologywillallow an earlydiagnosis and prevention of complications. This case illustrates the latediagnosis and management.

Background. Neurogenic myositis ossificans is a rare entity defined by the development of soft tissue ossifications in patients with paraplegia or tetraplegia following neurological pathologies, often after cranial or spinal cord trauma. The diagnosis is based on imaging, in particular CT scan, which often reveals the presence of intramuscular ossifications of periarticular location. Treatment is based on analgesics, physiotherapy, and surgery as a last resort. Case Report. We present a case of neurogenic myositis ossificans in a 26-year-old patient followed for axonal polyneuropathy secondary to vitamin deficiency. Conclusions. Neurogenic myositis ossificans is a rare entity but is easily diagnosed, given the context of severe neurological disorders and the characteristic appearance on CT scan. In doubtful and atypical cases, a biopsy with histological study is recommended.

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