Imaging Findings of an Epidermoid Cyst Undergoing Malignant Transformation.

Malignant transformation of epidermoid cyst into squamous cell carcinoma (SCC) is rare. We report the case of a 39-year-old woman presenting with dizziness and cerebellar ataxia. MR scan revealed a mass in the left cerebropontine angle compressing the brainstem and the cerebellum, with two main components, a cystic and a solid one.

Imaging of brain tumors.

Neuroimaging plays a crucial role in diagnosis of brain tumors and in the decision-making process for therapy. Functional imaging techniques can reflect cellular density (diffusion imaging), capillary density (perfusion techniques), and tissue biochemistry (magnetic resonance [MR] spectroscopy). In addition, cortical activation imaging (functional MR imaging) can identify various loci of eloquent cerebral cortical function.

Manifestations of pilocytic astrocytoma: a pictorial review.

Background: Pilocytic astrocytoma can be challenging to diagnose.

Methods: Its clinical presentations can differ, directly related to its size and location, and are relatively unreliable. Similarly, imaging findings also vary with the location of the pilocytic astrocytoma.

Radiation-induced intracranial meningioma and multiple cavernomas.

Brain irradiation has several well-known long-term side effects, including radiation-induced neoplasms and vasculopathy. In this case report, we describe an extremely rare case of meningioma and 15 cavernomas developing in a 29-year-old man, 19 years after cranial irradiation for posterior cranial fossa medulloblastoma. To our knowledge, this is the first case of a radiation-induced meningioma accompanied by this many radiation-induced cavernous angiomas.

An incidental nonfunctioning mediastinal paraganglioma (2009: 11b). Aorticosympathetic paraganglioma.

A rare case of an incidental nonfunctioning mediastinal paraganglioma is presented. The diagnosis of aorticosympathetic paraganglioma was established by histological examination after surgical removal of the tumor. The appearance of this rare tumor on multidetector coronary angiography is demonstrated and the differential diagnosis is discussed.