Nevus Flammeus Key Points Nevus flammeus or port-wine stain (PWS) is a congenital, low-flow vascular malformation of the skin that represents a progressive ectasia of the superficial cutaneous vascular plexus…

Neurothekeoma Key Points Neurothekeoma includes several lesions previously reported as nerve sheath myxoma or cellular neurothekeoma While some studies have questioned the relationship between these two entities, other authors have…

Neurofibroma, Plexiform Key Points Neurofibromatosis type 1 is an inherited multisystem neurocutaneous disorder The disease results from mutations in the NF1 gene that results in the loss of neurofibromin function…

Neurofibroma, Solitary Key Points Neurofibromas are tumors that arise from nonmyelinated Schwann cells and perineural fibroblasts Isolated neurofibromas are benign, slowly growing, unencapsulated neoplasms that usually arise from cutaneous nerves,…

Necrotizing Fasciitis Key Points Necrotizing fasciitis is an uncommon soft-tissue infection characterized by extensive suppurative fasciitis, vascular thrombosis, and cutaneous gangrene The infection progresses rapidly over hours to several days,…

Myasthenia Gravis Key Points Myasthenia gravis (MG) is an acquired neurological autoimmune disease characterized by skeletal muscle fatigability and weakness 75% to 80% of patients have IgG1 and IgG3 antibodies…

Molluscum Contagiosum Key Points Molluscum contagiosum (MC) is a benign viral infection found more commonly in warm, moist climates It is transmitted from one host to another by direct contact…

Mucormycosis Key Points Mucormycosis is a rapidly progressive angioinvasive infection in immunocompromised patients It is caused by saprophytic fungi of many genera related to Phycomycetes (Zygomycetes) of the order Mucorales…

Milia Key Points Milia are small, benign, superficial keratinous cysts that resemble miniature infundibular cysts on histopathology Congenital milia are common in newborns and present with a few or numerous…

Melanocytic Nevus Key Points Melanocytic nevus refers to common moles on the skin and is composed of nests of altered melanocytes Cutaneous melanocytic lesions are designated by the histopathologic location…