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Pathological changes after radiotherapy for primary pituitary carcinoma: a case report
Hideomi Yamashita1, Keiichi Nakagawa, Masao Tago
1Department of Radiology, University of Tokyo Hospital, 7-3-1, Hongo, Bunnkyou-ku, Tokyo 113-8655, Japan. yamashitah-RAD@h.u-tokyo.ac.jp
Journal of Neuro-Oncology
|November 12, 2005
Summary
This study details pathological changes in a rare pituitary carcinoma after radiotherapy. Radiotherapy led to significant necrosis but not apoptosis in tumor cells, offering insights into treatment response.
Area of Science:
- Endocrinology
- Oncology
- Pathology
Background:
- Pituitary carcinomas are exceptionally rare, with controversial definitions, diagnosis, therapy, and prognosis.
- No prior reports exist on pathological changes following radiotherapy for primary pituitary carcinoma.
Observation:
- A single case of presumed prolactin-staining pituitary carcinoma with premorbid intracranial dissemination was analyzed.
- The tumor was metabolically silent on PET scanning.
- The patient underwent external beam radiotherapy as primary treatment.
Findings:
- Post-irradiation histology showed over 50% necrotic tissue.
- Approximately three-fifths of viable tumor cells were unaltered, while two-fifths showed degeneration.
- Necrosis was observed, but apoptosis was absent in the cells after radiotherapy.
Implications:
- This case provides the first pathological description of pituitary carcinoma following radiotherapy.
- Findings contribute to understanding the effects of radiation on pituitary carcinoma, potentially informing future treatment strategies.
- Highlights the complex cellular responses to radiotherapy in rare endocrine malignancies.