Soru

During a visit to a sexual health clinic, a $29$-year-old male is evaluated for a rapidly enlarging, painful lump in the right groin area that has made walking difficult over the past week. He mentions that approximately three weeks prior, he had a small, painless sore on the coronal sulcus of his penis that completely resolved without any medical intervention. He is sexually active with several male partners and occasionally uses recreational drugs. Vital signs reveal a temperature of $37.9^\circ\text{C}$ ($100.2^\circ\text{F}$), pulse of $88/\text{min}$, and blood pressure of $118/76\text{ mm Hg}$. Genitourinary examination demonstrates no active ulcerative lesions. However, there is marked right inguinal lymphadenopathy that is tender and fluctuant, with a palpable horizontal indentation dividing the swelling into upper and lower masses. A rapid plasma reagin (RPR) test is nonreactive. Which of the following is the most likely diagnosis?