Disappearance of "Elongated Pony Tail Sign" Following Chemoradiotherapy in a Case of Primary Cerebellopontine Angle Ependymoma With Spinal Drop Metastasis: 18F-FDG PET/CT Scan Findings

Sarin Krishna; Abhiram G Ashwathanaryana; Rakesh Kumar Mishra; Shubham Asrani; Vinita Dewangan

doi:10.1097/RLU.0000000000005244

Disappearance of "Elongated Pony Tail Sign" Following Chemoradiotherapy in a Case of Primary Cerebellopontine Angle Ependymoma With Spinal Drop Metastasis: 18F-FDG PET/CT Scan Findings

Clin Nucl Med. 2024 May 9. doi: 10.1097/RLU.0000000000005244. Online ahead of print.

Authors

Sarin Krishna¹, Abhiram G Ashwathanaryana¹, Rakesh Kumar Mishra², Shubham Asrani³, Vinita Dewangan¹

Affiliations

¹ From the Departments of Nuclear Medicine.
² Medical Oncology, and.
³ Radiodiagnosis, Sanjeevani CBCC USA Cancer Hospital, Raipur, Chhattisgarh, India.

PMID: 38722186
DOI: 10.1097/RLU.0000000000005244

Abstract

Ependymomas are rare glial tumors that commonly arise from the lining cells of ventricular system and constitute ~10% of intracranial pediatric malignancies. The incidence of ependymoma in adults is rare. Due to close approximation with the ventricular system, subtentorial ependymomas are more prone to show cerebrospinal fluid metastasis compared with supratentorial ependymomas. We present a case of subtentorial cerebellopontine angle ependymoma with diffuse spinal drop metastases showing "elongated pony tail appearance" in a 69-year-old man with complete metabolic response on 18F-FDG PET/CT imaging following chemoradiotherapy.