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Primary intracranial choriocarcinoma: MR imaging findings
1Department of Medical Imaging Center, Nan Fang Hospital, Southern Medical University, Guangzhou, China.
Insights
Pineal intracranial primitive cerebral neuroectodermal tumors (PICCC) are rare and aggressive. MR imaging reveals heterogeneous lesions with specific enhancement patterns, aiding in diagnosis and avoiding unnecessary biopsies.
Area of Science:
- Neuro-oncology
- Neuroradiology
- Pediatric Oncology
Background:
- Pineal intracranial primitive cerebral neuroectodermal tumors (PICCC) represent the rarest and most malignant primary intracranial germ cell tumors.
- Accurate diagnosis is crucial due to their aggressive nature and potential for misdiagnosis with more common brain tumors.
Purpose of the Study:
- To characterize the specific Magnetic Resonance (MR) imaging findings of pathologically confirmed PICCC.
- To evaluate the utility of MR imaging features in differentiating PICCC from other primary brain tumors.
Main Methods:
- Retrospective analysis of MR imaging findings in 7 patients with pathologically proven PICCC.
- Detailed review of T2-weighted and post-contrast T1-weighted MR images, correlating with histological findings.
Main Results:
- Tumors were predominantly located in the pineal (6/7) or suprasellar (1/7) regions.
- MR imaging demonstrated marked heterogeneity on T2-weighted sequences (hypo- and hyperintense areas) and heterogeneous, ring-like, or nodular enhancement on post-contrast T1-weighted images.
- Histologic heterogeneity, including hemorrhage, fibrosis, cysts, or necrosis, contributed to the observed MR imaging characteristics.
Conclusions:
- Specific MR imaging findings, including lesion heterogeneity and enhancement patterns, are characteristic of PICCC.
- Combining MR imaging findings with patient age and serum β-HCG levels can aid in distinguishing PICCC from other primary brain tumors.
- These imaging biomarkers may help avoid invasive biopsy procedures for this highly vascular tumor.
Abstract:
PICCC is the rarest, most malignant primary intracranial GCT. The purpose of this study was to describe and characterize the MR imaging findings in a series of 7 patients (6 males and 1 female; mean age, 11.9 years) with pathologically proved PICCC in our institution from 2004 to 2009. All tumors were located within the pineal (n = 6) or suprasellar (n = 1) regions. On T2-weighted MR imaging, the lesions appeared markedly heterogeneous with areas of both hypointensity and hyperintensity reflecting the histologic heterogeneity, including hemorrhage, fibrosis, cysts, or necrosis. Heterogeneous (n = 7), ringlike (n = 4), and/or intratumoral nodular (n = 3) enhancement was noted on T1-weighted images with gadolinium. These MR imaging findings, combined with patient age and serum β-HCG levels, may prove helpful in distinguishing PICCC from the more common primary brain tumors, thereby avoiding biopsy of this highly vascular tumor.
