Fig. 3From: Syphilitic orchitis mimicking a testicular tumor in a clinically occult HIV-infected young man: a case report with emphasis on a challenging pathological diagnosis a Immunostain of syphilis shows spirochetes in the cytoplasm of histiocytes (1000 X, oil immersion). b DNA expression of TPmod1 is detected by PCR analysis. (Pos: positive control; Sample: tumor of the patient; Neg: negative control)Back to article page