Cancer can be considered a very large and exceptionally heterogeneous family of malignant diseases, with<unk> <unk><unk> s comprising one of the largest subsets. Terminology All<unk> <unk><unk>  lesions are thought to begin via the repeated, uncontrolled division of cancer stem<unk> s of epithelial lineage or characteristics. Accumulation of these cancer<unk> s causes a microscopic focus of abnormal<unk> s that are, at least initially, locally confined within the specific tissue in which the progenitor<unk>  resided. This condition is called<unk> <unk><unk>  in situ, and it is diagnosed when the tumor has not yet penetrated the basement membrane or other delimiting structure to invade adjacent tissues. Once the lesion has grown and progressed to the point where it has breached, penetrated, and infiltrated adjacent structures, it is referred to as "invasive"<unk> <unk><unk> . Once a<unk>  becomes invasive, it is able to spread to other organs and cause a metastasis, or "secondary tumor", to form.
Conjunctival squamous cell carcinoma
Pseudolymphoma
Rhinoscleroma
Odontogenic keratocyst
Fundic gland polyp
Aquarium granuloma
Idiopathic facial aseptic granuloma
Chorangioma