A 32-year-old man with no significant past medical history presents with fevers and night sweats. He reports that approximately 10 days ago he began to develop drenching night sweats, generalized fatigue, and fevers (measured on a home thermometer with a maximum temperature of 103°F). He endorses generalized headache, decreased appetite, and non-productive cough.

He denies recent weight loss, chest pain, shortness of breath, abdominal pain, diarrhea, constipation, joint pain, or new rash.

He presented to his local urgent care where he was found to have an abnormal complete blood count (CBC) with white blood cell count (WBC) 1.7 x 109/L, Hb 11.8 g/dL, and platelets 83 x 109/L. On review of prior lab work, his CBC was previously normal. He was subsequently sent to the emergency room for further evaluation.

Which of the following are possible causes of pancytopenia?

Aplastic anemia
This is a form of bone marrow failure with loss of hematopoietic stem cells.
Thrombotic thrombocytopenic purpura (TTP)
TTP is associated with anemia and thrombocytopenia.
Metastatic cancer to bone
Immune thrombocytopenia (ITP)
ITP is associated with thrombocytopenia alone.
Leukopenia develops secondary to hypersplenism. Thrombocytopenia develops from hypersplenism and reduced thrombopoietin production. Anemia is multifactorial and likely arises from hypersplenism, marrow suppression, and anemia of inflammation.

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