Table 2.

Characteristics of 12 consecutive patients with idiopathic EMH

Age/sex	Presentation	Diagnostic procedures	Involved sites	Hemoglobin, g/dl	Leukocyte count, ×109/l	Platelet count, ×109/l	Management	Follow-up since discovery of EMH (years)
71/F	Abdominal pain	MRI, FNA	Pre-sacral mass	13.4	4.4	320	Conservative	9
62/M	Interstitial pneumonia	Wedge biopsies	Right upper lobe lung mass	N/A	N/A	N/A	Conservative	4
23/M	FUO	PET, splenectomy	Splenomegaly	11.1	6	252	Surgical excision	9
78/F	Gallstone evaluation	MRI, FNAB	Pre-sacral mass	14.1	6.1	157	Conservative	7
72/M	Sacral chordoma	CT, FNAB	Pleural-based chest mass	11.4	4.7	131	Conservative	4
50/M	Back pain	CT, FNAB	Left retroperitoneal mass	15.4	11.9	310	Surgical excision	2
72/F	Recurrent UTI	MRI, FNAB	Pre-sacral mass	9.3a	10.5	431	Conservative	5
58/F	Para-spinal mass	PET, FNA	Para-spinal mass	10	7.5	295	Conservative	7
71/F	Dyspnea	CT, FNA	Para-spinal mass	14.2	9.6	222	Conservative	4
76/F	Abdominal pain	CT, FNA	Pre-sacral mass	14.2	5.8	244	Conservative	10
61/F	Splenomegaly	CT, splenectomy	Splenomegaly	16.5	7.6	187	Surgical excision	17
70/F	Back pain	CT, FNA	Para-spinal mass	14.8	7.8	171	Conservative	20

EMH extramedullary hematopoiesis, FNA fine needle aspiration, FNAB fine needle aspiration and biopsy, FUO fever of unidentified origin, MRI magnetic resonance imaging, N/A not available, PET positron emission tomography, CT computed tomography, UTI urinary tract infection

^aPatient was confirmed to have iron deficiency anemia and was successfully treated with iron supplement