Renal ectopia classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

There is no established system for the classification of [disease name].

OR

[Disease name] may be classified according to [classification method] into [number] subtypes/groups: [group1], [group2], [group3], and [group4].

OR

[Disease name] may be classified into [large number > 6] subtypes based on [classification method 1], [classification method 2], and [classification method 3]. [Disease name] may be classified into several subtypes based on [classification method 1], [classification method 2], and [classification method 3].

OR

Based on the duration of symptoms, [disease name] may be classified as either acute or chronic.

OR

If the staging system involves specific and characteristic findings and features: According to the [staging system + reference], there are [number] stages of [malignancy name] based on the [finding1], [finding2], and [finding3]. Each stage is assigned a [letter/number1] and a [letter/number2] that designate the [feature1] and [feature2].

OR

The staging of [malignancy name] is based on the [staging system].

OR

There is no established system for the staging of [malignancy name].

Classification

Pelvic kidney is the most common example of renal ectopia. Other sites of ectopic kidneys include the iliac region, the abdomen, the chest, and, in some cases, the contralateral side, referred to as “crossed” renal ectopia.

There are six subtypes of crossed fused renal ectopia:

• Inferior ectopia type with upper pole of ectopic kidney fusing with lower pole of normal kidney.
• Sigmoid or S-shaped kidney where hilum of ectopic kidney faces laterally and that of normal kidney medially and with fusion form S-shaped mass.
• Lump kidney with fusion of two kidneys over a wide margin with ureter from ectopic kidney crossing the midline.
• L-shaped or Tandem kidney in which the ectopic kidney is placed horizontally fusing with lower pole of normal kidney.
• Disc kidney with extensive fusion of two kidneys forming a disc shaped mass.
• Superior ectopia type with ectopic kidney placed above the normal kidney and fusing with its upper pole.