Match each clinical and neuroimaging presentation of a suspected intracranial mass with its correct diagnostic entity and characteristic pathophysiological or histological feature.
- Rapidly progressive cognitive decline and new-onset seizures. MRI reveals an irregularly enhancing hemispheric lesion crossing the corpus callosum.Glioblastoma; a high-grade neoplasm characterized histologically by microvascular proliferation and pseudopalisading necrosis.
- Slowly progressive asymmetrical sensorineural hearing loss. MRI reveals an enhancing mass at the cerebellopontine angle extending into the internal auditory canal.Vestibular schwannoma; a benign peripheral nerve sheath tumor that arises from neural crest cells and commonly causes early tinnitus.
- Gradual onset of focal motor seizures. MRI reveals a well-circumscribed, homogeneously enhancing extra-axial mass with a prominent 'dural tail'.Meningioma; a slow-growing tumor derived from arachnoid cap cells that often induces reactive hyperostosis in the overlying skull.
- Prolonged history of refractory focal seizures in a young adult. Imaging shows a cortically based frontal lobe mass with prominent coarse calcifications.Oligodendroglioma; a slow-growing glioma frequently harboring co-deletions and exhibiting a classic 'fried-egg' cellular appearance.
- Progressive ataxia and headaches with concurrent secondary polycythemia. MRI reveals a cystic posterior fossa mass with a strongly enhancing mural nodule.Hemangioblastoma; a highly vascular stromal tumor capable of ectopic erythropoietin production, strongly associated with von Hippel-Lindau disease.
Answer
The correct matches associate specific neuroimaging and clinical clues with the corresponding brain tumor: Butterfly glioma -> Glioblastoma; Cerebellopontine angle mass -> Vestibular Schwannoma; Dural tail -> Meningioma; Calcified frontal mass -> Oligodendroglioma; Cystic cerebellar nodule with polycythemia -> Hemangioblastoma.
Each vignette provides pathognomonic clinical and radiological clues that uniquely identify a specific intracranial tumor. Glioblastomas typically cross the midline ('butterfly' appearance). Vestibular schwannomas localize to the cerebellopontine angle and eighth cranial nerve. Meningiomas are extra-axial with a dural tail. Oligodendrogliomas are cortically based, calcified, and epileptogenic. Hemangioblastomas are cystic with a mural nodule and can cause paraneoplastic polycythemia.
Step-by-Step Solution
Key Concept
Neuro-oncologic diagnosis relies on integrating clinical presentation, exact neuroanatomical location on imaging, and specific histopathological or molecular markers.