A rare case of malignant pediatric ectomesenchymoma arising from the cerebrum.
Malignant ectomesenchymoma is a rare tumor that contains both ectodermal and mesenchymal elements. So far, only 7 patients with a manifestation in the cerebrum (with confirmed clinicopathological data) have been reported. A 4-year-old girl was present at our hospital with a 3-week history of intermittent sudden dizzy with no apparent cause. MRI showed an irregular enhanced lesion in the left frontal-parietal lobe and lateral ventricle with peripheral gadolinium-enhancement with a significant surrounding edema. Total removal of the tumor was performed. Histological examination of the resected tumor revealed a mixed astrocytoma and anaplastic ependymoma component with undifferentiated mesenchymal spindle cell component. Generally speaking, the main malignant part in most cases of malignant ectomesenchymoma (MEM) is the mesenchymal component. In the present case, the malignant component was both in the mesenchymal and ectodermal part. In particular, the mesenchymal part was mainly composed of spindle cells, and the ectodermal part primarily consisted of gliomatous component and anaplastic ependymoma component. The patient was then treated with chemotherapy and as regard to the prognosis, there was no evidence of tumor recurrence at the 5 months' follow-up. The long term follow-up is still in progress.
Department of Pathology, Beijing San Bo Brain Hospital, Capital Medical University Haidian District, Beijing, P. R. China.
Yao
Y
Kun
Department of Pathology, Beijing San Bo Brain Hospital, Capital Medical University Haidian District, Beijing, P. R. China.
Zejun
Z
Duan
Epilepsy Center, Guangdong 999 Brain Hospital Guangzhou, 510510, P.R. China.
Xi
X
Mei
Department of Editorial, Journal of Harbin Medical University Harbin, P. R. China.
Ying
Y
Xu
Department of Neurosurgery, Binzhou People's Hospital China.
Jiuzhou
J
Li
Department of Neurosurgery, Beijing San Bo Brain Hospital, Capital Medical University Haidian District, Beijing, P. R. China.
Shouwei
S
Li
Department of Pathology, Beijing San Bo Brain Hospital, Capital Medical University Haidian District, Beijing, P. R. China.
Xueling
X
Qi
D001254:Astrocytoma / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D014408:Biomarkers, Tumor / Q000032:analysis; D001706:Biopsy; D001932:Brain Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D054022:Cerebrum / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D017024:Chemotherapy, Adjuvant; D002675:Child, Preschool; D004806:Ependymoma / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D018193:Neoplasms, Complex and Mixed / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D013997:Time Factors; D016896:Treatment Outcome
D014408:Biomarkers, Tumor
Malignant ectomesenchymoma; cerebrum; intracranial mass; pediatric brain tumor