Subepidermal Calcinosis Key Points Subepidermal calcinosis is a form of localized cutaneous soft tissue calcium deposit It is classified as dystrophic, metastatic, calciphylaxis, iatrogenic, and idiopathic types The pathogenesis is…
Solitary Fibrous Tumor Key Points Solitary fibrous tumor (SFT), previously known as hemangiopericytoma, comprises a histologic spectrum of fibroblastic mesenchymal neoplasms The SFT group includes SFT and related lesions ranging…
Seborrheic Keratosis Key Points Seborrheic keratosis (SK) is the most common benign epithelial tumor and accounts for about 20% of benign epithelial neoplasms seen on the eyelid The pathogenesis of…
Sebaceous Duct Cyst Key Points Sebaceous duct cysts are sporadic, superficial cutaneous cysts caused by obstruction of the outflow duct of the sebaceous glands associated with the pilosebaceous follicular unit…
Sebaceous Adenoma Key Points Sebaceous adenoma is very rare tumor often associated with Muir Torre syndrome (MTS), a rare cancer predisposition disorder The cutaneous tumors associated with MTS include primarily…
Sarcoidosis Key Points Sarcoidosis is a multisystem inflammatory disease of unknown etiology characterized by noncaseating granulomas in the involved organs The most common manifestation is pulmonary involvement, but extrapulmonary manifestations…
Pyogenic Granuloma Key Points Pyogenic granuloma is a reactive benign vascular proliferation that can be seen on the skin or mucous membranes It can involve the conjunctiva and the eyelids…
Rhabdomyoma Key Points Rhabdomyoma is a rare benign mesenchymal tumor of soft tissue originating from skeletal muscle cells It is usually subdivided into two major subtypes, cardiac and extracardiac, based…
Punctal Stenosis and Agenesis Key Points Punctal stenosis is a condition in which the proximal external openings of the nasolacrimal drainage system on the medial eyelid margins are narrower than…
