A 35-year-old woman presents with a widespread maculopapular rash involving the trunk and extremities, including the palms and soles. She also reports fever, malaise, and generalized lymphadenopathy. Serological testing shows positive RPR and FTA-ABS. All of the following are characteristic features of secondary syphilis EXCEPT:

Explanation

## Secondary Syphilis: Clinical Manifestations **Key Point:** Secondary syphilis is a systemic disease occurring 4–10 weeks after primary infection. It presents with a polymorphic rash, constitutional symptoms, and widespread non-suppurative lymphadenopathy. Hepatosplenomegaly occurs but is **not always accompanied by jaundice**. ### Classic Features of Secondary Syphilis | Feature | Details | |---------|----------| | **Rash** | Maculopapular, polymorphic; characteristically involves **palms and soles** | | **Mucosal lesions** | Mucous patches (painless, grayish plaques); condyloma lata (painless, indurated, moist papules) | | **Systemic symptoms** | Fever, malaise, headache, myalgia, arthralgia | | **Lymphadenopathy** | Generalized, non-suppurative, firm, mobile; may persist months | | **Hepatosplenomegaly** | Common; **jaundice is NOT always present** | | **Serology** | RPR/VDRL positive (high titre); FTA-ABS positive | **High-Yield:** The **involvement of palms and soles** is a pathognomonic feature of secondary syphilis rash and is rarely seen in other rashes. **Mnemonic:** **SYPHILIS** — Secondary syphilis features: - **S**ystemic (fever, malaise) - **Y**es to palms/soles - **P**apules, maculopapular rash - **H**epatosplenomegaly - **I**ncluding mucous patches - **L**ymphdenopathy (non-suppurative) - **I**ndurated lesions (condyloma lata) - **S**erological positivity (RPR, FTA-ABS) ### Why Option 2 (Jaundice Always Present) is Wrong While hepatosplenomegaly is a common manifestation of secondary syphilis, **jaundice is NOT always present**. Hepatic involvement in secondary syphilis typically causes: - Mild hepatomegaly - Elevated transaminases - **Jaundice only in a minority of cases** (usually mild if present) The absence of jaundice does not exclude secondary syphilis or hepatic involvement. **Clinical Pearl:** Syphilitic hepatitis is usually mild and self-limited. Severe hepatitis or fulminant hepatic failure should prompt investigation for other causes (viral hepatitis, autoimmune hepatitis, drug-induced liver injury). ### Differential Diagnosis: Rashes with Palms/Soles Involvement | Condition | Rash Character | Other Features | |-----------|----------------|----------------| | **Secondary syphilis** | Maculopapular, polymorphic | Mucous patches, condyloma lata, non-suppurative lymphadenopathy | | **Measles** | Maculopapular, blanching | Koplik spots, cough, coryza | | **Rubella** | Fine maculopapular | Postauricular lymphadenopathy | | **Rocky Mountain spotted fever** | Petechial, centripetal | Tick exposure, fever, headache | | **Acute HIV** | Maculopapular | CD4 < 200, oral candidiasis | [cite:Park 26e Ch 8; Harrison 21e Ch 207]