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Click Fifty year old male with hepatic lesion undergoing anterior approach CT guided liver biopsy. FINDINGS: The needle (asterisk) passes through the right rectus sheath. TECHNIQUE: Axial unenhanced CT, 120 kVp, 165 mAs, 3mm slice thickness, obtained on Siemens Volume Zoom.

Click Fifty five year old male with biopsy needle tract seeding from HCC. A. There is a mass measuring 4.3 x 3.8 x 6.1 cm within the right rectus sheath (arrow). The mass demonstrates heterogeneous enhancement on venous phase images. B. Its enhancement is less intense and similar to that of the liver on delayed phase images. C. & D. Sagittal and coronal reconstructions of venous phase images showing the mass. It appears to invade the adjacent costochondral cartilage. Mild thickening of the anterior right hemidiaphragm suggests possible involvement. No obvious invasion of the underlying liver is seen, when accoutning for volume averaging artifact. There is no evidence of spread into the subcutaneous fat. TECHNIQUE: Contrast enhanced CT (120 cc iohexol) CT images in venous phase (100 kVp, 295 mAs, 5mm slice thickness, scan obtained 60 seconds following injection of contrast) and delayed phase (100 kVp, 261 mAs, 5mm slice thickness, scan obtained 3 minutes following injection of contrast) obtained on Siemens SOMATOM Definition AS.

Click Fifty five year old male with biopsy needle tract seeding from HCC. A. There is a mass measuring 4.3 x 3.8 x 6.1 cm within the right rectus sheath (arrow). The mass demonstrates heterogeneous enhancement on venous phase images. B. Its enhancement is less intense and similar to that of the liver on delayed phase images. C. & D. Sagittal and coronal reconstructions of venous phase images showing the mass. It appears to invade the adjacent costochondral cartilage. Mild thickening of the anterior right hemidiaphragm suggests possible involvement. No obvious invasion of the underlying liver is seen, when accoutning for volume averaging artifact. There is no evidence of spread into the subcutaneous fat. TECHNIQUE: Contrast enhanced CT (120 cc iohexol) CT images in venous phase (100 kVp, 295 mAs, 5mm slice thickness, scan obtained 60 seconds following injection of contrast) and delayed phase (100 kVp, 261 mAs, 5mm slice thickness, scan obtained 3 minutes following injection of contrast) obtained on Siemens SOMATOM Definition AS.

Click Fifty five year old male with biopsy needle tract seeding from HCC. A. There is a mass measuring 4.3 x 3.8 x 6.1 cm within the right rectus sheath (arrow). The mass demonstrates heterogeneous enhancement on venous phase images. B. Its enhancement is less intense and similar to that of the liver on delayed phase images. C. & D. Sagittal and coronal reconstructions of venous phase images showing the mass. It appears to invade the adjacent costochondral cartilage. Mild thickening of the anterior right hemidiaphragm suggests possible involvement. No obvious invasion of the underlying liver is seen, when accoutning for volume averaging artifact. There is no evidence of spread into the subcutaneous fat. TECHNIQUE: Contrast enhanced CT (120 cc iohexol) CT images in venous phase (100 kVp, 295 mAs, 5mm slice thickness, scan obtained 60 seconds following injection of contrast) and delayed phase (100 kVp, 261 mAs, 5mm slice thickness, scan obtained 3 minutes following injection of contrast) obtained on Siemens SOMATOM Definition AS.

Click Fifty five year old male with biopsy needle tract seeding from HCC. A. There is a mass measuring 4.3 x 3.8 x 6.1 cm within the right rectus sheath (arrow). The mass demonstrates heterogeneous enhancement on venous phase images. B. Its enhancement is less intense and similar to that of the liver on delayed phase images. C. & D. Sagittal and coronal reconstructions of venous phase images showing the mass. It appears to invade the adjacent costochondral cartilage. Mild thickening of the anterior right hemidiaphragm suggests possible involvement. No obvious invasion of the underlying liver is seen, when accoutning for volume averaging artifact. There is no evidence of spread into the subcutaneous fat. TECHNIQUE: Contrast enhanced CT (120 cc iohexol) CT images in venous phase (100 kVp, 295 mAs, 5mm slice thickness, scan obtained 60 seconds following injection of contrast) and delayed phase (100 kVp, 261 mAs, 5mm slice thickness, scan obtained 3 minutes following injection of contrast) obtained on Siemens SOMATOM Definition AS.

Click MRI of 55 year old male with needle tract seeding from HCC 5 years following percutaneous biopsy. MRI demonstrates right rectus sheath enhancing mass (arrow) abutting and possibly invading the adjascent costochondral cartilage. There is no obvious invasion of the adjacent liver. Axial T1 weighted Volumetric Interpolated Breath Hold Examination image (VIBE, TR 7.22, TE 3.38, 4mm slice thickness, 1.5 Tesla).

Click MRI of 55 year old male with needle tract seeding from HCC 5 years following percutaneous biopsy. MRI demonstrates right rectus sheath enhancing mass (arrow) abutting and possibly invading the adjascent costochondral cartilage. There is no obvious invasion of the adjacent liver. Axial T2 weighted Half-Fourier Acquisition Single-Shot Turbo Spin-Echo image (HASTE, TR 1000, TE 80, 6mm slice thickness, 1.5 Tesla).

Click MRI of 55 year old male with needle tract seeding from HCC 5 years following percutaneous biopsy. MRI demonstrates right rectus sheath enhancing mass (arrow) abutting and possibly invading the adjascent costochondral cartilage. There is no obvious invasion of the adjacent liver. Axial post gadolinium T1 weighted images (VIBE, arterial phase after administration of 19 cc gadolinium intravenously, TR 7.22, TE 3.38, 4 mm slice thickness).

Click MRI of 55 year old male with needle tract seeding from HCC 5 years following percutaneous biopsy. MRI demonstrates right rectus sheath enhancing mass (arrow) abutting and possibly invading the adjascent costochondral cartilage. There is no obvious invasion of the adjacent liver. Coronal post gadolinium T1 weighted images (VIBE, arterial phase after administration of 19 cc gadolinium intravenously, TR 7.22, TE 3.38, 4 mm slice thickness).