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Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Contrast-enhanced computed tomography scans (Sensation 16 Siemens, Erlangen, 332 mA, 120 KV, slice thickness 5 mm) (Arterial phase: acquisition after 30 s non-ionic iodinated i.v. contrast injection) of the upper abdomen (non-ionic iodinated contrast medium: Visipaque GE Healthcare 320 mg I/ml, 100 ml, flow 2 ml/s). Axial CT images demonstrate homogeneous hypo-attenuating soft tissue around intra-hepatic bile ducts, with no enhancement.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Contrast-enhanced computed tomography scans (Sensation 16 Siemens, Erlangen, 332 mA, 120 KV, slice thickness 1-5 mm) (Delayed phase: acquisition after 240 s non-ionic iodinated i.v. contrast injection) of the upper abdomen (non-ionic iodinated contrast medium: Visipaque GE Healthcare 320 mg I/ml, 100 ml, flow 2 ml/s). Axial CT images demonstrate homogeneous hypo-attenuating soft tissue around intra-hepatic bile ducts, with minimal enhancement, encasing the common bile duct.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Contrast-enhanced computed tomography scans (Sensation 16 Siemens, Erlangen, 332 mA, 120 KV, slice thickness 1-5 mm) (Portal phase: acquisition after 60 s non-ionic iodinated i.v. contrast injection) of the upper abdomen (non-ionic iodinated contrast medium: Visipaque GE Healthcare 320 mg I/ml, 100 ml, flow 2 ml/s). Axial CT images demonstrate homogeneous hypo-attenuating soft tissue around intra-hepatic bile ducts, with minimal enhancement, encasing the common bile duct.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Unenhanced computed tomography scans (Sensation 16 Siemens, Erlangen, 332 mA, 120 KV, slice thickness 5 mm). Axial CT images demonstrate homogeneous hypo-attenuating soft tissue around intra-hepatic bile ducts.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T2-weighted images TSE fat sat (TE: 84 ms, TR: 111080 ms; slice thickness: 5.0 mm) the pathological tissue shows inhomogeneous hyperintense signal.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T1-weighted image, 3D-GRE, (TR= 5.12 ms, TE= 2.51 ms, slice thickness= 3.5 mm): the pathological tissue shows hypointense signal.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Axial T1-weighted image, 3D-GRE, (TR= 5.12 ms, TE= 2.51 ms, slice thickness= 3.5 mm): Arterial phase: after intravenous administration of gadolinium-based contrast agent (Gd-BOPTA; Multihance, Bracco, Italy; 0,1 mmol/Kg; flow 2 ml/s) the lesion, hypointense, shows no enhancement.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T1-weighted image, 3D-GRE, (TR= 5.12 ms, TE= 2.51 ms, slice thickness= 3.5 mm): after intravenous administration of gadolinium-based contrast agent (Gd-BOPTA; Multihance, Bracco, Italy; 0,1 mmol/Kg; flow 2 ml/s) on scans acquired in portal phase the lesion reveal minimal enhancement.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T1-weighted image, 3D-GRE, (TR= 5.12 ms, TE= 2.51 ms, slice thickness= 3.5 mm): after intravenous administration of gadolinium-based contrast agent (Gd-BOPTA; Multihance, Bracco, Italy; 0,1 mmol/Kg; flow 2 ml/s) on scans acquired in equilibrium phase the lesion reveal minimal enhancement.

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T1-weighted image, 3D-GRE, (TR= 5.12 ms, TE= 2.51 ms, slice thickness= 3.5 mm). The mass shows progressive enhancement on scans acquired 5 minutes after i.v. injection (Gd-BOPTA; Multihance, Bracco, Italy; 0,1 mmol/Kg; flow 2 ml/s).

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T2-weighted images TSE fat sat (TE: 84 ms, TR: 111060 ms; slice thickness: 5.0 mm) The pathological tissue shows progressive enhancement 10 minutes after i.v. injection (Gd-BOPTA; Multihance, Bracco, Italy; 0,1 mmol/Kg; flow 2 ml/s).

Click 59 years-old male Caucasian patient with extramedullary haematopoiesis. Magnetic resonance imaging of the upper abdomen (Symphony Siemens 1.5 T, Erlangen). Axial T1-weighted image, 3D-GRE, (TR= 5.12 ms, TE= 2.51 ms, slice thickness= 3.5 mm). The mass was inhomogeneously filled on 15 minutes after i.v. injection (Gd-BOPTA; Multihance, Bracco, Italy; 0,1 mmol/Kg; flow 2 ml/s) scans, showing hyperintense foci within the lesion.