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Difficulty: MediumNeurosurgery

Match each patient's clinical presentation and characteristic neuroimaging findings with the most likely primary intracranial tumor diagnosis.

  • A 55-year-old woman with gradual onset of right leg weakness. MRI shows a densely enhancing extra-axial parasagittal mass with a dural tail.Meningioma
  • A 65-year-old man with rapidly progressive aphasia and confusion. MRI reveals a large, irregular ring-enhancing intra-axial lesion crossing the corpus callosum.Glioblastoma multiforme
  • A 45-year-old man with progressive right-sided hearing loss and tinnitus. MRI demonstrates a solid, homogeneously enhancing mass in the cerebellopontine angle.Vestibular schwannoma
  • A 35-year-old man with headaches, ataxia, and polycythemia. MRI shows a cystic cerebellar mass with a brightly enhancing mural nodule.Hemangioblastoma

Answer

Parasagittal extra-axial mass with dural tail matches Meningioma. Ring-enhancing lesion crossing the corpus callosum matches Glioblastoma multiforme. Cerebellopontine angle mass matches Vestibular schwannoma. Cystic cerebellar mass with a mural nodule matches Hemangioblastoma.
Each specific primary brain tumor exhibits a distinct triad of patient demographics, anatomical location, and radiological appearance. Extra-axial lesions with dural tails point to meningiomas. Aggressive necrotic lesions crossing the midline confirm glioblastomas. Cerebellopontine angle lesions with auditory symptoms indicate vestibular schwannomas. Finally, cyst-and-nodule cerebellar morphologies with erythropoietin secretion are diagnostic of hemangioblastomas.

Step-by-Step Solution

1
Analyze the first clinical vignette involving an extra-axial mass with a dural tail and lower extremity weakness.
Identify this pattern as characteristic of a Meningioma.
The dural tail sign and the extra-axial location pushing against the cortex are pathognomonic radiological features of meningiomas.
2
Examine the second vignette describing a rapidly progressive, ring-enhancing intra-axial lesion crossing the corpus callosum.
Match this presentation with Glioblastoma multiforme.
The 'butterfly glioma' appearance resulting from the crossing of white matter tracts along with central necrosis is classic for this aggressive astrocytoma.
3
Review the third vignette focusing on unilateral hearing loss and a cerebellopontine angle mass.
Match this with Vestibular schwannoma.
Tumors localized to the cerebellopontine angle causing distinct cranial nerve VIII deficits (hearing loss, tinnitus) are overwhelmingly vestibular schwannomas.
4
Evaluate the fourth vignette featuring a cystic cerebellar mass, a mural nodule, and polycythemia.
Match this with Hemangioblastoma.
Cystic cerebellar masses with an enhancing mural nodule, especially when accompanied by paraneoplastic erythropoietin production, are classic for hemangioblastomas.

Key Concept

Identifying primary intracranial tumors based on the correlation of clinical presentation, anatomical location, and pathognomonic neuroimaging findings.
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Topics

Neurosurgery

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