An 8-year-old boy presents with freckling in the armpits, soft skin tumors over the back, and learning difficulties. His father has similar skin lesions. The images show findings under the slit lamp. What is the most likely diagnosis?

1. A

   A. Neurofibromatosis type 2 (NF2)

2. B

   B. Tuberous sclerosis complex

3. C

   C. Sturge-Weber syndrome

4. D

   D. Neurofibromatosis type 1 (NF1)

Appeared in: INI-CET EXAM -2026

Explanation

• The correct diagnosis is Neurofibromatosis type 1 (NF1) because the patient's signs and symptoms meet the established diagnostic criteria.
• The patient presents with axillary freckling (Crowe's sign) and soft skin tumors (neurofibromas), which are hallmark cutaneous features of NF1.
• The slit-lamp image reveals Lisch nodules (pigmented iris hamartomas), a finding present in over 90% of adults with NF1.
• A family history of a first-degree relative (the father) with similar skin lesions further supports the diagnosis, as NF1 is an autosomal dominant disorder.
• The presence of learning difficulties is also a common neurological manifestation associated with NF1.

Why Other Options Were Wrong

• Option A: NF2 is incorrect because its primary feature is bilateral vestibular schwannomas, leading to hearing loss and balance issues. The skin and eye findings in the patient are not characteristic of NF2.
• Option B: Tuberous sclerosis is incorrect as it is characterized by different skin lesions (ash-leaf spots, angiofibromas, shagreen patches) and ocular findings (retinal hamartomas), none of which are present in this case.
• Option C: Sturge-Weber syndrome is incorrect. It is a sporadic neurocutaneous disorder defined by a facial port-wine stain, seizures, and glaucoma, which are absent in this patient.

Related Visual

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Diagnosis of Neurofibromatosis Type 1 (NF1) based on clinical and familial criteria in acute care settings.
• Nurses play a vital role in identifying the signs of NF1 during routine pediatric assessments, which can lead to early diagnosis and management.
• Management of NF1 is multidisciplinary, involving regular monitoring for complications such as hypertension, scoliosis, optic pathway gliomas, and malignant transformation of neurofibromas.
• Patient and family education is crucial. This includes genetic counseling (due to the 50% chance of passing the gene to offspring) and providing resources for managing learning disabilities and social challenges.

How to Approach the Question

• First, analyze the patient's demographic data and presenting symptoms from the clinical scenario (age, signs, family history).
• Identify the key clinical findings: axillary freckling, soft skin tumors, and learning difficulties.
• Note the positive family history, which suggests a genetic condition.
• Carefully examine the provided image. Identify the finding as Lisch nodules on the iris, which are associated with a slit-lamp exam.
• Synthesize all the findings. A cluster of specific signs (café-au-lait spots, neurofibromas, axillary freckling, Lisch nodules, family history) is required for diagnosis.
• Evaluate the options by comparing the patient's clinical picture to the known characteristics of each syndrome. Select the diagnosis that aligns with the evidence.

Concept Tested & Keywords

• Concept Tested: Diagnosis of Neurofibromatosis Type 1 (NF1) based on clinical and familial criteria.
• Stem keywords: freckling in the armpits, soft skin tumors, learning difficulties, father has similar skin lesions, slit lamp
• Lead-in keywords: most likely diagnosis
• Clinical cues: The combination of skin findings (axillary freckling, neurofibromas), ocular findings (Lisch nodules in the image), and a positive family history is a classic presentation for NF1.

Question ID

QfIqd6tGaF9CSzD3P-U8wO

Copy ID

Reference Book

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 pp. 1458-1460, 1878-1880

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 576-578