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| | THE MERCK MANUAL, Sec. 5, Ch. 50, Diffuse Connective Tissue Disease |
 | | Etiology and pathogenesis of temporal arteritis (TA) are unknown. |
 | | The histologic reaction is a granulomatous inflammation of the intima and inner part of the media; lymphocytes, epithelioid cells, and giant cells predominate. |
 | | Presentations are diverse, depending on the distribution of the arteritis, but typically include severe headache (especially temporal and occipital), scalp tenderness, and visual disturbances (amaurosis fugax, diplopia, scotomata, ptosis, blurred vision). |
| www.merck.com /mrkshared/mmanual/section5/chapter50/50l.jsp (526 words) |
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