✅ Model Answer:
• Osteochondritis – metaphyseal lucent bands (most common).
• Periostitis – lamellated periosteal new bone formation.
• Wimberger sign – bilateral symmetric metaphyseal destruction (medial proximal tibia).
• Widened growth plate – irregular metaphyses with fraying.
• Pathologic fractures – may be present in severe cases.
• Diagnosis: Congenital syphilis.

✅ Model Answer:
• Wimberger sign: Bilateral symmetric destruction of the medial proximal tibial metaphysis.
• It is a pathognomonic radiographic finding of congenital syphilis.
• Mechanism: Treponemal invasion of the metaphysis → osteochondritis → necrosis and destruction.
• It is most commonly seen in the proximal tibia but may also occur in the distal femur or proximal humerus.
• Significance: It is a key diagnostic feature of congenital syphilis and should prompt immediate evaluation and treatment.
• Other conditions with similar findings: Osteomyelitis, trauma, scurvy (but Wimberger sign is specific to syphilis).

✅ Model Answer:
• Mucocutaneous:
- Snuffles (persistent rhinitis) – earliest manifestation.
- Maculopapular rash – involving palms and soles (desquamating).
- Condylomata lata – moist, flat, papules in the perineal area.
- Muccous patches in the mouth.
• Systemic:
- Hepatosplenomegaly (common).
- Jaundice, anemia, thrombocytopenia.
- Generalized lymphadenopathy.
- Failure to thrive, irritability, poor feeding.
• Skeletal:
- Pseudoparalysis (pain from osteochondritis).
- Radiographic changes (metaphyseal lucent bands, periostitis).
• Central nervous system:
- Neurosyphilis – may be asymptomatic or present with seizures, hydrocephalus, or meningismus.
- Hearing loss, vision impairment.

✅ Model Answer:
• This is a suspected case of congenital syphilis – requires a full workup.
• Diagnostic workup:
1. Serology:
- RPR/VDRL (non-treponemal) – quantitative titers in infant and mother.
- TP-PA (treponemal) – confirmatory.
- If maternal RPR is reactive, compare infant and maternal titers.
2. Complete blood count (CBC): Anemia, thrombocytopenia, leukocytosis.
3. Liver function tests (LFTs): Hepatomegaly, elevated transaminases.
4. Long bone X-rays: Osteochondritis, periostitis, Wimberger sign.
5. Lumbar puncture (CSF): To evaluate for neurosyphilis – VDRL (CSF), cell count, protein.
6. Ophthalmology exam: Chorioretinitis, optic atrophy.
7. Audiology: Hearing assessment.
8. Assessment of other organ systems: Cardiac, renal (rare).

✅ Model Answer:
• Treatment: Aqueous crystalline penicillin G IV.
• Dose: 50,000 units/kg/dose IV every 12 hours for the first 7 days of life, then every 8 hours for a total of 10 days.
• Indications for treatment:
- Confirmed or highly suspected congenital syphilis (symptomatic, abnormal CSF, reactive RPR > maternal titers).
- Infants born to mothers with untreated or inadequately treated syphilis.
- Infants with reactive RPR and any abnormalities (CXR, CSF, CBC).
• If penicillin allergy: Desensitization is required (no alternative in neonates).
• Monitoring: Serial RPR/VDRL titers (at 3, 6, 12, 18, and 24 months) to ensure decline.
• Follow-up: Repeat CSF examination at 6 months if initial CSF was abnormal.

✅ Model Answer:
• This indicates neurosyphilis – a serious complication of congenital syphilis.
• Significance:
- Requires intensified treatment – aqueous penicillin G IV for 10-14 days.
- Monitor for complications: Seizures, hydrocephalus, hearing loss, cognitive impairment.
• Management:
1. IV penicillin G: As per standard regimen (50,000 U/kg/dose q12h for 7 days, then q8h for total 10 days).
2. Repeat CSF examination: At 6 months of age (or after 6 months of treatment) to confirm resolution.
3. Ophthalmology: Assess for chorioretinitis or optic atrophy.
4. Audiology: Hearing assessment.
5. Neurology follow-up: For long-term neurodevelopmental monitoring.
6. Monitor: RPR/VDRL titers as per protocol.

✅ Model Answer:
• Late congenital syphilis presents after 2 years of age.
• Features:
1. Dental: Hutchinson teeth – peg-shaped, notched incisors (upper central).
2. Ocular: Interstitial keratitis – corneal opacity, photophobia, lacrimation.
3. Skeletal: Saber shins – anterior bowing of the tibia.
4. Neurological: Eighth nerve palsy – sensorineural hearing loss.
5. Rhagades: Linear scars at the corners of the mouth (from healed fissures).
6. Frontal bossing: Prominent forehead.
7. Joint involvement: Clutton joints – bilateral knee effusions (painless).
8. Osteomyelitis: Gummatous lesions (rare).
9. Cardiovascular: Aortitis (rare in children).
• Treatment: Aqueous penicillin G (if signs of active infection) or benzathine penicillin (for latent).

✅ Model Answer:
• A reactive RPR at 12 months suggests inadequate treatment or re-infection.
• Management:
1. Full evaluation:
- Physical examination, CBC, LFTs, long bone X-rays.
- CSF analysis (if not done previously or if abnormal).
- Ophthalmology and audiology assessments.
2. Repeat treatment: Aqueous penicillin G IV for 10-14 days (if neurosyphilis is excluded) or for 10-14 days (if CSF is abnormal).
3. Monitor RPR titers: Monthly until non-reactive or declining.
4. Consider maternal re-infection: Screen mother for syphilis (if applicable).
5. Long-term follow-up: Regular neurodevelopmental assessments.

✅ Model Answer:
• Radiography (long bone X-rays) is essential for the diagnosis of congenital syphilis.
• Findings:
- Osteochondritis: Metaphyseal lucent bands (most common).
- Periostitis: Lamellated new bone formation.
- Wimberger sign: Medial tibial metaphyseal destruction (pathognomonic).
- Pathologic fractures – may be seen in severe cases.
• Role:
1. Supports the diagnosis: In symptomatic infants.
2. Identifies asymptomatic infants: Who may have skeletal involvement.
3. Guides treatment: If radiographic findings are present, the infant requires full course of penicillin.
4. Monitoring: Follow-up X-rays to assess healing (although not routinely required).

✅ Model Answer:
• A desquamating rash on the palms and soles is a classic feature of early congenital syphilis.
• Significance:
- Indicates active treponemal infection and requires immediate treatment.
- The rash is a manifestation of secondary syphilis.
• Management:
1. Full evaluation: As per standard protocol (serology, CSF, long bone X-rays, etc.).
2. Treatment: Aqueous penicillin G IV for 10 days.
3. Supportive care: Skin care (gentle cleansing, emollients).
4. Monitor: Resolution of rash with treatment.
5. Prevent complications: Monitor for secondary infection of lesions.

✅ Model Answer:

Condition	Key Radiographic Features
Congenital Syphilis	Metaphyseal lucent bands, periostitis, Wimberger sign (medial tibial)
Rickets	Widened growth plate, fraying, cupping, no periostitis
Scurvy	Frankel line, Trummerfeld zone, Pelkan spur, Wimberger ring
Osteomyelitis	Lytic lesions, sequestrum, periosteal reaction (often focal)