Fine Needle Aspiration Cytology diagnosed Rosai-Dorfman Disease in a 12-year-old male by identifying emperipolesis, facilitating rapid diagnosis in a resource-limited setting.
Case Report (n=1)
No
High-quality FNAC can reliably establish the diagnosis of Rosai-Dorfman Disease by identifying emperipolesis in resource-limited settings where advanced diagnostic tools are scarce.
Background: Rosai-Dorfman Disease (RDD) is a rare, benign, non-Langerhans cell histiocytosis characterized primarily by massive, painless cervical lymphadenopathy. Its low prevalence (~ 1:200,000) and clinical similarity to endemic conditions like tuberculosis and lymphoma make the diagnosis challenging, particularly in resource-limited settings. Definitive diagnosis hinges on identifying S100-positive histiocytes exhibiting the pathognomonic feature of emperipolesis. Case Presentation: A previously healthy 12-year-old male from Uganda presented with a one-month history of progressive, asymptomatic, bilateral cervical lymphadenopathy. Systemic symptoms were absent. A provisional diagnosis of RDD was established rapidly via Fine Needle Aspiration Cytology (FNAC). Cytological smears showed abundant histiocytes demonstrating clear emperipolesis, confirming the classic cytological diagnosis. Despite the recommendation for a confirmatory excisional biopsy and further subtyping, the patient was lost to follow-up. Conclusion: This case demonstrates that high-quality FNAC can reliably establish the diagnosis of RDD in environments where advanced diagnostic tools are scarce, but also underscores the critical need to strengthen patient follow-up systems to ensure complete evaluation and long-term monitoring of rare histiocytic disorders. Keywords: Rosai-Dorfman Disease, Fine Needle Aspiration Cytology, Emperipolesis, Cervical Lymphadenopathy, Uganda
Posite et al. (2026) conducted a case report in Pediatric Rosai-Dorfman Disease (n=1). Fine Needle Aspiration Cytology (FNAC) was evaluated on Diagnosis of Rosai-Dorfman Disease via cytological identification of emperipolesis on FNAC smears. Fine Needle Aspiration Cytology diagnosed Rosai-Dorfman Disease in a 12-year-old male by identifying emperipolesis, facilitating rapid diagnosis in a resource-limited setting.