Non-Conforming Still's Disease With Low Ferritin and No Skin Rash: A Case Report.

Adult Still's disease (ASD) is an inflammatory disorder with an unclear etiology. It is a rare disease that was first described more than a century ago. Its common characteristics are daily fevers, arthritis, and skin rash. ASD is diagnosed after excluding infections, malignancies, and connective tissue diseases. It has a female predominance. Classic skin rash and high serum ferritin levels are commonly associated with this condition and help in the diagnosis. Due to a lack of pathognomic clinical and laboratory features, a valid diagnostic criterion, the Yamaguchi criteria, is generally used for the diagnosis. The disease has a good prognosis with appropriate treatment. We present the case of a young gentleman who presented with fever, anemia, and leucocytosis; however, his serum ferritin levels were normal, and there was no typical salmon-colored skin rash. Hyperferritinemia developed later in the disease course, leading to a diagnosis of ASD.