Classification of inguinal hernias (Nyhus)

Type 1
Indirect hernia with normal internal ring

Type 2
Indirect hernia with dilated internal ring. Posterior wall intact

Type 3
Posterior wall defect

A
Direct inguinal hernia

B
Indirect inguinal hernia. Internal ring dilated. Posterior wall defective

C
Femoral hernia

Type 4
Recurrent hernia