Organomegaly

Definitions for various organs

Values refer to adults unless otherwise specified.

|- | Liver || Hepatomegaly ||

• Medical imaging: Longitudinal axis 15.5 cm at the hepatic midline, or 16.0 cm at the midclavicular line
• Autopsy: Weight over upper limit of standard reference range, of 1860 g in men and 1770 g in women. |- | Lymph nodes || Lymphadenopathy || Generally 10 mm |- | Renal pelvis || Part of hydronephrosis grading | 4 – 20 mm:
• Fetal: Anteroposterior diameter of less than 4 mm in fetuses up to 32 weeks of gestational age and 7 mm afterwards.Page 189 in:
• Adults: cutoff values defined differently by different sources, with anteroposterior diameters ranging between 10 and 20 mm. About 13% of normal healthy adults have a transverse pelvic diameter of over 10 mm. |- | Prostate || Prostatomegaly || Volume over 30 cm3. |- | Pulmonary artery || Dilation || 29 mm |- |
• 2.5 cm on CT scans :*Mild: 2.5–2.9 cm :*Moderate: 3-4 cm :*Severe: 4 cm
• 3 cm on abdominal X-rays (Projectional radiography confers a geometric magnification compared to CT) |- | Wall thickening || 3–5 mm |- | Spleen || Splenomegaly |
• Medical imaging: Largest dimension of over 11 cm, or craniocaudal height of 13 cm. :* Moderate splenomegaly: the largest dimension is between 11–20 cm :* Severe splenomegaly: the largest dimension is greater than 20 cm
• Autopsy: Weight over upper limit of standard reference range, of 230 g |- | Diameters:
• 3.5 cm generally Upper limits of standard reference range:
• Ascending aorta: :*3.3 cm in small young individuals :*4.3 cm among large elderly individuals.
• Descending thoracic aorta, :*2.3 cm among small young individuals :*3.2 cm among large elderly individuals. |- | Thoracic aortic aneurysm | Diameter:
• 4.5 cm (US)
• 4.0 cm (Korea) |- | Testis || Enlargement || 5 cm (long axis) x 3 cm (short axis) |- | Tonsil || Enlarged tonsil || 2.5 cm in length, 2.0 cm in width and 1.2 cm in thickness. |- | Ureter || Megaureter || 6 or 7 mm |- | Urinary bladder || Wall thickening || 3–5 mm thick, and |}

References

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