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Pineal parenchymal tumor of intermediate differentiation with late spinal dissemination 13 years after initial surgery: illustrative case

Hiroyuki Kato, Takafumi Tanei, Yusuke Nishimura, Yoshitaka Nagashima, Motonori Ishii, Tomoya Nishii, Nobuhisa Fukaya, Takashi Abe, and Ryuta Saito

intracranial PPTID. Illustrative Case A 14-year-old female presented with headache and diplopia. Bilateral papilledema and left eye abduction disorders were also observed. Magnetic resonance imaging (MRI) revealed a solitary mass lesion in the pineal region with contrast enhancement on T1-weighted imaging, which induced obstructive hydrocephalus ( Fig. 1 ). The patient had no relevant medical or family history. Initially, a biopsy of the lesion and endoscopic third ventriculostomy were performed. Histological examination revealed hypercellular proliferation, small