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Importance of clinical and morphological correlations in diagnosing langerhans cell histiocytosis
Langerhans cell histiocytosis (LCH) is a clonal histiocytic disorder. The variable
clinical manifestations from isolated bone lesion to multisystem disease can cause
difficulties and delay in diagnosis. We report a 2 years and 8 months-old girl who
presented with a 2 weeks history of persistent fever and weight loss associated with
progressive abdominal distension. Physical examination revealed pallor, bilateral
proptosis, seaborrheic dermatitis over the scalp and hepatosplenomegaly. Skull
X-ray demonstrated multiple lytic lesions at the base and the skull vault. Bone
marrow morphology showed numerous abnormal Langerhans cells (LCs) and
foamy macrophages. The trephine immunohistochemistry (IHC) stains for CD1a,
S-100 and CD68 were inconclusive. The diagnosis of multisystem Langerhans
cell histiocytosis (MS-LCH) in this patient was based on the clinical presentation,
radiological and morphological analysis. She subsequently received chemotherapy
and currently she is on maintenance therapy with a good clinical response. LCH is
a rare disease and although the IHC was inconclusive, the correlation of clinical,
radiological and morphological data are essential for the diagnosis