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A leiomyosarcoma (LMS) is a rare malignant (cancerous) smooth muscle tumor. [1] The word is from leio- 'smooth' myo- 'muscle' and sarcoma 'tumor of connective tissue'. The stomach, bladder, uterus, blood vessels, and intestines are examples of hollow organs made up of smooth muscles where LMS can be located; however, the uterus and abdomen are the most common sites.
Desmoplastic melanoma, also known as neurotropic melanoma, or spindled melanoma [1] is a rare cutaneous condition characterized by a deeply infiltrating type of melanoma [2]: 696 with an abundance of fibrous matrix. It usually occurs in the head and neck region of older people with sun-damaged skin.
Clear cell sarcoma is a sub-type of a rare form of cancer called a sarcoma. [1] It is known to occur mainly in the soft tissues and dermis . Rare forms were thought to occur in the gastrointestinal tract before they were discovered to be different and redesignated as gastrointestinal neuroectodermal tumors .
On histopathology, Spitz nevi characteristically have vertically arranged nests of nevus cells that have both a spindled and an epithelioid morphology. Apoptotic cells may be seen at the dermoepidermal junction. The main histologic differential diagnoses are pigmented spindle cell nevus and malignant melanoma.
Spindle cell sarcoma is a type of connective tissue cancer. The tumors generally begin in layers of connective tissue , as found under the skin, between muscles, and surrounding organs, and will generally start as a small, inflamed lump, which grows in size.
Melanocytic tumors of uncertain malignant potential (MELTUMP) are melanocytic lesions in the dermis that cannot be classified by morphology as either benign naevi (moles) or malignant melanomas because the mass shows features of both.
In neurobiology, spindle cell refers to: Spindle neuron, also known as a von Economo neuron; In general medicine, a spindle cell may refer to the spindle-shaped cells that are found in certain types of tumor: Inflammatory fibroid polyp; Pigmented spindle cell nevus; Spindle cell carcinoma; Spindle cell lipoma; Spindle cell sarcoma
Atypical fibroxanthoma (AFX) of the skin is a low-grade malignancy related to malignant fibrous histiocytoma, which it resembles histologically. [2]: 613 Atypical fibroxanthoma manifests as a hard, pink or red papule or nodule that grows over the course of several months and may bleed or ulcerate.