A contrast-filled bladder that has a teardrop shape (also referred to as pear-shaped) indicates circumferential extrinsic compression. The differential diagnosis includes:
- presence of pelvic fluid
- pelvic lipomatosis
- usually seen in black males with hypertension
- iliopsoas muscle hypertrophy
- retroperitoneal fibrosis
- vascular dilatation
- collateral vessel development
Ambos MA, Bosniak MA, Lefleur RS, et al. The pear-shaped bladder. Radiology 1977;122:85-8.
Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics 2004;24:S247-80.