MRCP2-2400

A 19-year-old female presents to the emergency department with a two-week history of right upper quadrant pain and longstanding pain in her right femur. She recently returned from a trip to Tanzania. On examination, she has mild tenderness in the right upper quadrant, hepatomegaly, splenomegaly, and conjunctival pallor. Her blood work shows anemia, thrombocytopenia, and elevated LDH. An ultrasound reveals massive splenomegaly and hepatomegaly, while an x-ray of the right femur shows an Erlenmeyer flask deformity. What is the most likely diagnosis?