case_images: PMC3420471_01
case_images: Axial (a) and sagittal (b) T1-weighted MRI with gadolinium and axial (c) T2-weighted MRI before surgery revealing a large cystic lesion of left CPA with enhancement of lower portion of the lesion and severe compression of forth ventricle and brainstem.
case_images: CRIM.NM2011-525289.001.jpg
case_images: PMC3420471_01_CRIM.NM2011-525289.001.jpg
case_images: fig1
case_images: Magnetic resonance imaging (MRI) revealed a large cystic lesion of CPA, hypointense on T1-weighted image, and hyperintense on T2-weighted image, extending to the left parapontine, with partial enhancement of the capsule after intravenous administration of gadolinium (Figure 1).
case_images: Axial (a) T1-weighted MRI with gadolinium and coronal; (b) T2-weighted MRI after the first surgery showing growth of the heterogeneous lesion with predominant enhancement and invading the surrounding structures.
case_images: CRIM.NM2011-525289.002.jpg
case_images: PMC3420471_01_CRIM.NM2011-525289.002.jpg
case_images: fig2
case_images: MRI demonstrated a large heterogeneous mass isointense on T1-weighted image, hyperintense on T2-weighted image, strongly enhanced after gadolinium, extending to the upper medulla oblongata with hydrocephalus and unusual edema (Figure 2).
case_images: Malignant squamous cell carcinoma arising from the epidermal cyst, with mitotic activity and cellular atypia (hematoxylin and eosin, original magnification x400).
case_images: CRIM.NM2011-525289.003.jpg
case_images: PMC3420471_01_CRIM.NM2011-525289.003.jpg
case_images: fig3
case_images: These areas of typical epidermal cyst were juxtaposed with zones that displayed marked nuclear irregularity with mitotic activity and an infiltrative growth pattern (Figure 3).