Giant cell tumour of the tendon sheath (GCTTS) is a slowly progressing benign tumour arising from synovial cells of tendon sheaths. It is one of the most common soft tissue tumours in the hand. We report a retrospective study of 27 proven GCTTS of the hand. The mean length of follow-up was 4.5 years (17 months-8.5 years). Radiographic findings are useful and may prove of great diagnostic value. The positive diagnosis was provided by the pathology examination after complete excision that was performed in all patients. The recurrence was noted in two surgically managed cases. The excision should be meticulous and complete in order to avoid recurrence.

Echinococciasis is a zoonotic infestation, which generally involves the liver and the lungs. Primary muscle hydatidosis is an uncommon finding. The authors report a case of primary hydatid cyst localized in the right long head of the biceps femoris of a 25-year-old woman. A wide excision of the cyst with a safety margin was performed. No recurrence has been detected after a 3-year follow-up period. The authors review the literature and discuss the MRI findings. The diagnosis of muscular hydatid cyst is done using clinical and radiological findings in endemic context.

Lipomas are extremely common benign soft tissue tumors that are usually subcutaneous and asymptomatic. However, an intramuscular lipoma, occurring adjacent to the proximal radius, may easily cause paralysis of the posterior interosseous nerve because of a specific anatomical relationship of these structures in that area. In this report, we describe an unusual case of a 48-year-old-woman with a posterior interosseous nerve syndrome due to an intramuscular lipoma. The patient had good recovery after surgery and rehabilitation physiotherapy.

Obturator dislocation of the hip associated with ipsilateral femoral neck fracture is an unusual injury. We report a case of a 40-year-old man with such a combination of injuries which was treated with an open reduction and internal fixation. He has a good follow-up result. There was no evidence of avascular necrosis on radiographs after 3 years.

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Post-partum pubic symphysitis is an exceptional pathology. Its diagnosis is difficult, based on a high clinical semiological finesse complemented by imaging examinations, the most specific of which are CT and pelvic MRI. The earlier the diagnosis, the better the evolution. We report a case of pubic symphysitis occurring in the aftermath of a low-pathway delivery discovered in a septic shock table. Evolution was good under antibiotic and heparin therapy.

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