<unk>  (also called tug lesion or periosteal<unk>  is an irregularity of the distal femoral cortex caused by repetitive stress at the attachment of the adductor magnus aponeurosis. It is most commonly seen in adolescents and is usually asymptomatic. It is a benign and self-limiting lesion.
Cortical desmoid
Neuromatrix
Ossification center
Vernix caseosa
Fibrous cap
Livedo reticularis
Chondroid syringoma
Dennie–Morgan fold