The investigation of choice for diagnosis of Giant cell Aeritis is

Answer is A (Temporal Aery Biopsy): Temporal aery biopsy is the gold standard test for diagnosing giant cell Aeritis - Current Rheumatology The diagnosis of giant cell Aeritis is confirmed by Temporal Aery Biopsy-Harrisons Diagnosis of Giant cell Aeritis (GCA) 50 years" align="left" height="28" width="300">Diagnosis of GCA is suggested clinically by demonstration of complex offever, anemia and high ESR with or without polymyalgia Rheumatica in a patient > 50 years. Diagnosis is confirmed by biopsy of temporal aery (Gold standard). Colour duplex ultrasonographv of affected temporal aery can show a characteristic halo of edema and stenosis but this investigation is no more sensitive for the diagnosis of GCA than careful physical examination (Current Rheumatology). CT Angiographv and MRI may be useful for assessment of Temporal Aery but are not the investigations of choice.