Myositis ossificans circumscripta (MOC) is a benign condition of non-neoplastic heterotopic bone formation in the muscle or soft tissue. Trauma plays a role in the development of MOC, thus, non-traumatic MOC is very rare. Although MOC may occur anywhere in the body, the lesions are localized predominantly in the high-risk sites of injury, such as the thigh, buttock, and elbow. MOC can easily be mistaken for osteomyelitis or a malignant tumor, specifically osteosarcoma or soft-tissue sarcoma. We report a rare case of non-traumatic myositis ossificans circumscripta of thigh which appear clinically and radiologically as a malignant neoplasm. Despite its rarity, MOC should be contemplated in the differential diagnosis of malignant tumors.

Schwannomas are common, benign tumors of the shelth of peripheral nerves. Sciatic schwannomas are rare. Their symptomatology usually mimics sciatic pain due to a herniated disc, which can delay the diagnosis. If there is no lumbar pain and lumbar MRI is normal, the sciatic nerve must be clinically and radiologically examined all along its course. We report a case of sciatic nerve schwannoma presenting with chronic sciatica which was diagnosed and monitored radiologically for several years before successful surgical resection.

Amputation appears to be an effective treatment method in squamous carcinoma secondary to chronic osteomyelitis.

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Bilateral anterior dislocation of the shoulders is very rare. A 20-year-old man presented with bilateral anterior shoulder dislocation as a result of a diving incident. He complained of pain and restriction of movement in both shoulders with abducted and externally rotated arms. Radiographs revealed that the shoulders were dislocated. The patient was treated with closed reduction and was able to resume swimming 3 months later. To our knowledge, this is the first bilateral anterior dislocation of the shoulders during a backstroke swimming competition that was caused by this mechanism of injury. The rarity of this lesion and its uncommon mechanism prompted us to relate this observation.

IntroductionSoft tissue myoepithelial carcinoma and myoepithelioma are rare entities, part of myoepithelial tumors. They were incorporated into the World Health Organization classification of soft tissue tumors in 2002. Here we present an exceptional case of myoepithelial carcinoma and myoepithelioma association. To the best of our knowledge, such an association has never been reported in the literature.Case presentationWe report a case of myoepithelial carcinoma combined with myoepithelioma occurring in the soft tissue of the right forearm of an 84-year-old Arabian man. We describe the clinical, radiological and pathological features dominated by histological polymorphism. We will also describe the proposed histological criteria of malignancy and the major role of immunohistochemistry in positive and differential diagnosis. We finally mention the therapeutic arsenal available.ConclusionThrough this work, we report that myoepithelioma of soft tissue can progress to malignant myoepithelioma.

The authors report three cases of pelvic bone hydatidosis: two men and a woman aged from 25 to 42 years. The lesions were extensive: In two cases, they extended to the entire hemipelvis, and in one case, the extension was to the sacrum, which makes it difficult to carry out a radical surgery. In two cases, computed tomography was evocative and allowed for the completion of a local and precise checkup for a patient through MRI. At the therapeutic level, the first patient was treated by curettage and sterilization with oxygenated water followed by medical treatment, but with recurrence few months later. The second patient was put only under medical treatment because of the extent of the lesions, allowing therefore for clinical and radiological stabilization. Concerning the last patient, she benefitted from the resection of the femoral head and the right iliac wing followed by a medical treatment. The evolution was favorable with a three-year recession. The actual treatment of the osseous echinococcosis would be a combination of albendazole and surgery.

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