Essentials of Diagnosis Isolated thrombocytopenia Other hematopoietic cell lines normal No systemic illness Spleen not palpable Normal bone marrow with normal or increased megakaryocytesEssentials of Diagnosis • Isolated thrombocytopenia. • Other hematopoietic cell lines normal. • No systemic illness. • Spleen not palpable. • Normal bone marrow with normal or increased megakaryocytes