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Table 1 Shamblin classification of carotid body paraganglioma. Shamblin, 1971 [13]

From: Giant carotid chemodectoma treated with a combination of surgery and CyberKnife radiotherapy: a case report and review of the literature

Group Features
I Tumors < 4 cm in size not surrounding or infiltrating the carotid and excision done without difficulty
II Tumors > 4 cm in size partially surrounding or infiltrating the carotid and excision done with difficulty
IIIa I, II or III infiltration of carotid vessel; > 4 cm in size and intimately infiltrating or surrounding the carotid vessels with difficulty requiring vascular repair, sacrifice, or vessel replacement
IIIb