Imaging findings of extraventricular choroid plexus papillomas: A study of 10 cases

Abstract

Abstract. Extraventricular choroid plexus papillomas (CPPs) are rare. In this study, we reveal the imaging findings of CPPs located in extraventricular sites. The imaging findings of 11 masses [10 masses on magnetic resonance imaging (MRI) and one mass on computed tomography (CT)] of extraventricular CPP in 10 patients were retrospectively observed. The mass site, size, contour, signal intensity, cystic or solid appearance, calcification, capsules, degree and pattern of enhancement, and hydrocephalus were evaluated based on CT or MRI. The misdiagnosis rate of CPPs in extraventricular sites was 80.0% (8/10). Solitary masses and multiple masses were observed in nine patients (90.0%, 9/10) and one patient (10%, 1/10), respectively. In addition to the typical imaging findings [a lobulated, cauliflower-like or mulberry-like mass that is homogeneous isointense or slightly hypointense on T1-weighted imaging (T1WI) and heterogeneous isointense or slightly hyperintense on T2WI], four masses had round or oval contours and three had cystic components; abnormal signal intensity (mixed hyperintense signals on T1WI and T2WI or slightly hyperintense signals on T1WI or hypo-/hyperintense on T2WI) and low or no enhancements were observed in three and six masses, respectively; absence of hydrocephalus and mild or local hydrocephalus were each observed in four subjects, respectively. Hemorrhage and psammomatous bodies and/or calcification were observed in four and three masses, respectively. In conclusion, in addition to the typical imaging findings, atypical imaging findings, including atypical contours, abnormal signal intensity, low enhancement and absence of hydrocephalus were also observed in extraventricular CPPs.

Infantile medulloepithelioma in the lateral ventricle and cerebellopontine angle

“…After gadolinium injection, CPP shows marked homogenous or heterogeneous enhancement. [ 12 ] Such features are indistinguishable from radiological findings in our first patient. The only possible method for accurate diagnosis is by pathology.…”

Lateral ventricular medulloepithelioma in children: a case report

“…The MRI features of choroid plexus papilloma are currently described as having isodensity or mild low density in T1weighted imaging and heterogeneous and isodense lobular mulberry-like masses in T2-weighted imaging. After injection of gadolinium contrast agent, choroid plexus papilloma showed obvious uniform or uneven enhancement (14). In our case, these features are not different from the MRI findings.…”

Extracerebral choroid plexus papilloma in the pharynx with airway obstruction in a newborn: a case report

“…3 a Whitish protruding mass between the prevertebral fascia and nasal septum in the transoral view (arrow). b Gross tissue [13]. Limitation of this case is that did not performed enhanced MRI, but in the preoperative contrast-enhanced CT scan showed purely cystic legion without enhancing portion.…”

“…The mass also spontaneously decreased in size with time. On MR images, most of CPPs appear as isointense to hypointense intraventricular masses, and following contrast injection, they demonstrate notable homogeneous or heterogeneous enhancement, because typical CPPs are known as hypervascular tumors [13]. However, the misdiagnosis rate of extraventricular CPPs is high as other diseases, including meningioma, neurinoma and ependymoma Fig.…”