1. Instituto Estadual do Cérebro Paulo Niemeyer, Rio de Janeiro RJ, Brazil. 2. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil. Mailing address: Dr. Bruno Niemeyer de Freitas Ribeiro. Instituto Estadual do Cérebro Paulo Niemeyer – Departamento de Radiologia. Rua do Rezende, 156, Centro. Rio de Janeiro, RJ, Brazil, 20231-092. E-mail: bruno.niemeyer@ hotmail.com. cades o...

A Bengal tiger was presented for evaluation of weakness, ataxia and inappetance. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed a mass extending from the T7-8 vertebral body to the left rib and compressing the spinal cord. On CT, the bone destruction and sequestrum were shown. On MRI, the multilobulated mass appeared hypo- to isointense in T1-weighted and hyperintense in...

Primary chordoma of the paranasal sinuses are extremely rare tumours, with only a small number of cases verified and published in the literature. It appears that only five of these cases involved the ethmoid sinuses either as a primary or by local invasion, and of these documented cases only one other has been found to solely involve the ethmoid sinus. We present a case of primary ethmoid sinus...

Collision tumors are exceptional, associating two independent tumoral contingents. We report a case of an association of two rare tumors: sinonasal adenocarcinoma and chondroid chordoma. Initially, only adenocarcinoma was diagnosed. The treatment consisted of endoscopic endonasal surgery followed by conventional radiotherapy. After 18 months, a local recurrence was diagnosed after a facial trau...

Clival chordoma is a rare primary bone tumour that arises from the remnant of the notochord and typically occurs in older adults. Upon imaging, the tumour can be seen arising from the clivus and causes clival destruction. This usually provides insight for a diagnosis. Here we present a case of a non-enhancing, pre-pontine mass that was hypointense on T1W and hyperintense on T2W in an adolescent...

Chordomas are rare locally invasive malignant bone tumors arising from remnants of embryonic notochord. Dedifferentiated chordoma (DC), a subtype, is characterized by the presence sarcomatous component in conventional (CC) which may arise de novo or as transformation previously treated chordoma. The dedifferentiation warrants poor prognosis due to distant metastasis and recurrences. De DCs pose...

OBJECT Metastastic lesions have been reported in 5 to 40% of patients with spinal and sacrococcygeal chordoma, but few contemporary series of chordoma metastastic disease exist in the literature. Additionally, the outcome in patients with chordoma-induced metastastic neoplasms remains unclear. The authors performed a retrospective review of the neurosurgery database at the University of Texas M...

An 8-year-old boy presented with a 1-year history of low backache, followed by paraparesis and urinary incontinence. MRI of the thoracic spine revealed an intramedullary, intensely contrast-enhancing lesion extending from T11 to L1 vertebral level, consistent with astrocytoma, ependymoma or haemangioblastoma. A diagnosis of intramedullary chordoma was made on tissue biopsy and immunohistochemic...

A rare neoplasm derived from notochordal remnants, chordoma has a wellcharacterized tendency to recur following an intralesional resection. Margin-free total en bloc spondylectomy (TES) is the only surgical approach associated with no tumor recurrence at follow-up longer than 5 years. Incidental durotomy is a common complication of TES. We report a novel technique to repair incidental durotomie...