SUMMARYMobile intraspinal tumours have rarely been reported. In most cases, mobile tumours such as schwannomas or ependymomas were located in the cauda equina. Perusal of the literature revealed only two reports of mobile schwannomas in the cervical and thoracic regions. We report a case of thoracic schwannoma which migrated twice in successive operations resulting in negative exploration in the expected area. The aim of this report is to remind the surgeons about the possibility of migration of intradural-extramedullary tumour. BACKGROUND

Cavernous haemangiomas are vascular malformations that may affect any part of the central nervous system. Epidural haemangiomas are rare and constitute ~4% of all epidural tumours and 12% of all intraspinal haemangiomas. These tumours enlarge slowly and produce symptoms of progressive myelopathy or radiculopathy or both. History, clinical examination, routine radiographs, MRI and histopathological studies are the aids for a definitive diagnosis. Surgery can give a very beneficial result with good functional and neurological improvement. Chance of recurrence is less after a good surgical removal. Here we present a case of spinal extradural cavernous haemangioma in a 65- year-old man who had a good functional and neurological recovery after surgery. At 9 months postoperative follow-up, he did well without any new problems with regard to recurrence. We report this case for its rarity.

Ewing's sarcoma, a highly malignant bone tumour, typically affects the pelvis and the long bones of the lower extremities in children and young adults and primary involvement of the skull is rare. Here, we present a case of primary Ewing's sarcoma of the skull with localised swelling in a young adult that involved the frontoparietal region of the skull and was very aggressive in nature. Even with aggressive surgery, the patient had multiple recurrences within 1 month of surgery and ultimately the patient died.

A new case of spinal cord compression by an isolated osteochondroma (OC) of the spinal canal arising from the posterior arch of the atlas is added to the 15 previously reported cases in the English-language medical literature. CASE PRESENTATIONA 16-year-old male, with no signifi cant family history, presented with a history of suboccipital headache and progressively increasing quadriparaesis for duration of over 6 months with no bladder or bowel dysfunction. Physical examination revealed spastic quadriparaesis grade 4. INVESTIGATIONSCervical CT scan with 3D reconstruction ( fi gure 1 ), following a questionable plain radiograph, showed an intraspinal OC arising from the posterior arch of the atlas in the midline protruding into the spinal canal. MRI ( fi gure 2 ) showed signifi cant compression of the spinal cord with high signal intensity of the cord at C1 level.

Chronic subdural haematoma (CSH) is a well-known disease entity; however, calcified CSH (CCSH) is quite rare. Here the authors report on a 65-year-old man who developed gradual left hemiparesis and had gradually deteriorating level of consciousness for 1 month. CT scan revealed a huge right-sided CCSH. He underwent surgery and the CCSH was excised totally. The patient recovered well and was able to do his daily activities by himself. Surgical treatment for CCSH results in good neurological outcome.