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Wooden Foreign Bodies

Imaging Appearance

¹ All authors: Department of Radiology, Mayo Clinic, 4500 San Pablo Rd., Jacksonville, FL 32224-3899.

View larger version (107K): [in a new window]   Fig. 1A. —Retained wooden foreign body in 11-year-old boy with 2-year history of elbow pain and swelling. Anteroposterior elbow radiograph shows subtle extrinsic erosion (arrow) related to close proximity of retained wooden foreign body.

View larger version (121K): [in a new window]   Fig. 1B. —Retained wooden foreign body in 11-year-old boy with 2-year history of elbow pain and swelling. Anteroposterior elbow radiograph after performance of arthrogram shows marked reactive synovitis.

View larger version (119K): [in a new window]   Fig. 1C. —Retained wooden foreign body in 11-year-old boy with 2-year history of elbow pain and swelling. Axial CT scan of elbow after performance of arthrogram reveals subtle hyperattenuating structure, which at surgery proved to be retained wooden foreign body (open arrow) with associated extrinsic erosion to posterior cortex of humerus (solid arrow).

View larger version (85K): [in a new window]   Fig. 2A. —49 year-old woman who stepped on toothpick 7 days before imaging. Spin-echo T1-weighted axial MR image (TR/TE, 700/20) of forefoot shows retained wooden foreign body as focal signal void (open arrow) with surrounding hypointense inflammatory reaction (solid arrow).

View larger version (88K): [in a new window]   Fig. 2B. —49 year-old woman who stepped on toothpick 7 days before imaging. Corresponding spin-echo T2-weighted axial MR image (2,000/90) depicts retained wood as signal void (open arrow) with hyperintense surrounding foreign body granulomatous response (solid arrow).

View larger version (112K): [in a new window]   Fig. 3A. —11-year-old girl who presented for 2 years with intermittently draining sinus on dorsum of foot at site of previous surgery for ganglion. Sagittal short tau inversion recovery MR image shows hypointense retained wooden foreign body with surrounding high-signal inflammatory response.

View larger version (156K): [in a new window]   Fig. 3B. —11-year-old girl who presented for 2 years with intermittently draining sinus on dorsum of foot at site of previous surgery for ganglion. Three-dimensional surface rendered CT scan of foot shows retained wooden foreign body within soft tissue between first and second metatarsals.

View larger version (96K): [in a new window]   Fig. 3C. —11-year-old girl who presented for 2 years with intermittently draining sinus on dorsum of foot at site of previous surgery for ganglion. Gross specimen photograph depicts toothpick removed at surgery.

View larger version (100K): [in a new window]   Fig. 4A. —Retained wooden foreign body with abscess and draining sinus tract in 49-year-old man who fell off roof into foliage several months earlier. Spin-echo T2-weighted axial MR image (TR/TE, 2,716/80) of right thigh reveals retained wooden foreign body (asterisk) in right vastus lateralis muscle. Hypointense retained wood is seen centrally with surrounding hyperintense inflammatory response.

View larger version (124K): [in a new window]   Fig. 4B. —Retained wooden foreign body with abscess and draining sinus tract in 49-year-old man who fell off roof into foliage several months earlier. Sagittal short tau inversion recovery MR image (2,300/30; inversion time, 150 msec) shows foreign body as signal void with surrounding hyperintense granulomatous response. Note associated cellulitis and sinus tract extending through subcutaneous adipose tissue.

View larger version (111K): [in a new window]   Fig. 4C. —Retained wooden foreign body with abscess and draining sinus tract in 49-year-old man who fell off roof into foliage several months earlier. Gray-scale sonogram shows hyperechoic retained wooden foreign body with associated acoustic shadowing.

View larger version (82K): [in a new window]   Fig. 4D. —Retained wooden foreign body with abscess and draining sinus tract in 49-year-old man who fell off roof into foliage several months earlier. Gross specimen photograph shows large twig removed at surgery.

View larger version (73K): [in a new window]   Fig. 5A. —40-year-old woman with draining sinus tract on plantar aspect of foot with multiple prior débridements with history of penetrating trauma 2 years earlier. Sagittal reformatted CT scan of forefoot shows hyperdense retained wooden foreign body in plantar soft tissues of foot.

View larger version (142K): [in a new window]   Fig. 5B. —40-year-old woman with draining sinus tract on plantar aspect of foot with multiple prior débridements with history of penetrating trauma 2 years earlier. Sonogram of foot shows retained wooden foreign body with hyperechoic leading edge and obscuration of trailing edge by acoustic shadowing.

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