Ata Ppgl External Beam Radiation Indication

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name: ata-ppgl-external-beam-radiation-indication
description: Recommends stereotactic radiotherapy for local control of head and neck paraganglioma and postoperative radiotherapy for incompletely resectable spinal paraganglioma; considers external beam radiation therapy for local control of pheochromocytoma and paraganglioma outside the head and neck. Indicated when a clinician asks whether to recommend radiation therapy for local control in a PPGL patient, triggered by unresectable or incompletely resected PPGL lesion.
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# Indicate external beam radiation therapy for pheochromocytoma and paraganglioma local control

## STEP 1 — Gather Information
Collect tumor location (head and neck, spinal, adrenal, extra-adrenal), resectability status (complete vs incomplete resection), presence of local invasion (especially spinal), prior surgical or treatment history, catecholamine secretion status (functional vs nonfunctional), genetic background if known, and current imaging (MRI/CT) to assess tumor extent and proximity to critical structures.

## STEP 2 — Rule In / Rule Out
Is the lesion a head and neck paraganglioma (HNPGL)? If yes, proceed to recommend stereotactic radiotherapy; if no, proceed to evaluate spinal or extracranial PPGL.

## STEP 3 — Classify or Stratify
For non-head-and-neck PPGL, classify as spinal paraganglioma with incomplete resection versus pheochromocytoma or paraganglioma outside the head and neck (including completely resectable spinal PGL).

## STEP 4 — Decide
For head and neck PGL: recommend stereotactic radiotherapy (e.g., 15–24 Gy in 1–5 fractions). For incompletely resectable spinal PGL: recommend postoperative radiotherapy (e.g., 30–40 Gy in conventional fractionation). For PCC or PGL outside the head and neck: consider external beam radiation therapy for local control, noting low complication incidence and good tolerability.

## Clinical Guardrails / Mimics / Pitfalls
Do not use EBRT as first-line when complete surgical resection is feasible; ensure preoperative α-blockade for functional tumors to prevent hypertensive crises during planning/treatment; avoid EBRT in pregnancy unless absolutely necessary and with fetal shielding; verify target delineation to spare spinal cord, brainstem, or cranial nerves; do not substitute EBRT for systemic therapy in metastatic disease without multidisciplinary review; recognize that EBRT does not address hormonal excess; consider genetic testing results for familial syndromes that may influence radiation sensitivity.

## Concrete Clinical Example
A 62-year-old patient with a sporadic spinal paraganglioma underwent laminectomy but had residual tumor encasing the vertebral body due to unsafe resection near the spinal cord. Postoperative MRI showed 1.5 cm residual disease. The tumor was nonfunctional. Recommend postoperative external beam radiation therapy (30 Gy in 5 fractions) for local control, with follow-up MRI at 3 months.

**Source:** Japan Endocrine Society Clinical Practice Guideline for the Diagnosis and Management of Pheochromocytoma and Paraganglioma 2025, Japan Endocrine Society, 2025, doi:10.1507/endocrj.EJ25-0165