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. 2021 Jan 7;11(1):89. doi: 10.3390/diagnostics11010089

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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IIA variations. (G1) Communication vein between the IIV and the EIV. (H1) Separated trunk of bilateral internal iliac veins connecting with each other before draining into the left CIV. (H2) The internal iliac veins form a common trunk, that drains into the inferior vena cava. (H3) The internal iliac veins form a common trunk, which drains into the inferior vena cava, communication vein between the IIVs and ipsilateral EIV. (H4) Both IIVs are joined by a connecting vein that drains into the IVC. (L) Communication veins. (L1,L2) Communication vein between the IIV and ipsilateral CIV. (L3,L4) communication vein between the IIV and contralateral CIV. (L5,L6) Both internal iliac veins are joined with a communication vein, which drains into the inferior vena cava. (L7,L8) Communicating vein between both IIVs. Variations (G1,L1,L3,L5,L7) are related to right pelvic sidewall, whereas variations (G2,L2,L4,L6,L8) are related to left pelvic sidewall.