Polyarteritis is a multisystemic panarteritis
involving medium-sized and small arteries.
Temporal artery biopsy revealing panarteritis
with dense mixed inflammatory infiltrate, disrupting external and internal elastic lamina (H-E x 4 and H-E x 10).
Subsequently, this nonspecific panarteritis
that affects the intima and the adventitia of the aorta and its major branches was called Takayasu's arteritis.
Takayasu aortoarteritis (TA) is a rare, chronic large-vessel granulomatous panarteritis
of unknown aetiology, affecting the aorta and its major branches.