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Erschienen in:
01.02.2016 | Classics in Abdominal Imaging
The “molar tooth” sign
Erschienen in: Abdominal Radiology | Ausgabe 2/2016
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The shape of a “molar tooth” with its distinctive roots (Fig. 1) has been used to metaphorically describe the distribution of contrast material in the setting of extraperitoneal bladder rupture as seen on computed tomographic (CT) cystography (Fig. 2). In the presence of pelvic fractures, concomitant bladder injuries are seen in 5–10% of patients [1]. Bladder injury should also be suspected in the presence of gross hematuria, suprapubic or abdominal pain, and difficulty voiding.
Fig. 1
Detail from a mandibular panorex image demonstrating the typical appearance of a molar tooth (←). Note the mildly displaced fracture involving the socket of the second lower molar in this patient with history of trauma. (Image courtesy of Ms. Robin Berrie.)
Fig. 2
Axial image through the pelvis from a CT cystogram demonstrating the “molar tooth” sign of extravasated contrast material accumulating anterior and lateral to the bladder (prevesical space) consistent with extraperitoneal bladder rupture
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