Radiodiagnosis, SGPGIMS, Lucknow, Uttar Pradesh, India.
Pathology, SGPGIMS, Lucknow, Uttar Pradesh, India.
BMJ Case Rep. 2021 Jun 28;14(6):e242865. doi: 10.1136/bcr-2021-242865.
Medulloblastoma is a common paediatric posterior fossa tumour typically presenting as midline intra-axial mass involving the cerebellar vermis and/or roof of fourth ventricle with typical radiological features. These can be extra-axial in extremely rare instances with less than 50 cases reported so far in literature. We present a case of 18-year-old boy presenting with ataxia and headache. MRI showed dural mass (involving the left tentorium cerebellum) with typical imaging features of extra-axial lesion. The patient underwent near total excision of the tumour. Histopathology along with immunohistochemistry revealed the mass to be medulloblastoma. We present this case to highlight rarity of this location for medulloblastoma and the importance of considering this in the differential diagnosis of atypical posterior fossa extra-axial lesions. This can help in performing other relevant preoperative workup similar on the lines of medulloblastoma and planning of relevant management.
髓母细胞瘤是一种常见的儿童后颅窝肿瘤，通常表现为中线颅内肿块，累及小脑蚓部和/或第四脑室顶，具有典型的影像学特征。在极少数情况下，肿瘤可能位于颅外，目前文献中报道的病例少于 50 例。我们报告了一例 18 岁男孩，表现为共济失调和头痛。MRI 显示硬脑膜肿块（累及左小脑幕），具有典型的颅外病变影像学特征。患者接受了肿瘤的近全切除。组织病理学和免疫组织化学显示该肿块为髓母细胞瘤。我们报告这个病例是为了强调髓母细胞瘤在这个位置的罕见性，以及在鉴别诊断不典型后颅窝颅外病变时考虑这一点的重要性。这有助于进行其他类似髓母细胞瘤的相关术前检查，并制定相关的治疗计划。
