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A. Anterior versus posterior subcapsular location. The thyroid capsule (echogenic line) contacting the anterior strap muscles can be regarded as the anterior capsule (solid line). Other areas can be classified as the posterior capsule (dotted line).
B. Posteromedial versus posterolateral thyroid capsule. The posterior thyroid capsule can be divided into halves, namely, the posteromedial and posterolateral capsule.
