A glomus tumor (also known as a "solitary glomus tumor," "solid glomus tumor,"or glomangioma) is a rare benign neoplasm arising from the glomus body and mainly found under the nail, on the fingertip or in the foot.:670 They account for less than 2% of all soft tissue tumors.Glomus tumors were first described by Hoyer in 1877, while the first complete clinical description was given by Masson in 1924. Histologically, glomus tumors are made up of an afferent arteriole, anastomotic vessel, and collecting venule. Glomus tumors are modified smooth muscle cells that control the thermoregulatory function of dermal glomus bodies. As stated above, these lesions should not be confused with paragangliomas, which were formerly also called glomus tumors in now-antiquated clinical usage. Glomus tumors do not arise from glomus cells, but paragangliomas do. Familial glomangiomas have been associated with a variety of deletions in the GLMN (glomulin) gene, and are inherited in an autosomal dominant manner, with incomplete penetrance. Presentation Glomus tumors are usually solitary and small lesions. The vast majority of are found in the distal extremities, particularly in the hand, wrist, foot, and under the fingernails. They are often painful, and the pain is reproduced when the lesion is placed in cold water. These tumors tend to have a bluish discoloration, although a whitish appearance may also be noted. Elevation of the nail bed can occur. In rare cases, the tumors may present in other body areas, such as the gastric antrum or glans penis. Treatment is essentially the same. The exact incidence of glomus tumors is unknown. The multiple variant is rare, accounting for less than 10% of all cases. The probable misdiagnosis of many of these lesions as hemangiomas or venous malformations also makes an accurate assessment of incidence difficult. Mortality/Morbidity The most common adverse effect is pain, which is usually associated with solitary lesions. Multiple tumors are less likely to be painful. In one report, a patient with more than 400 glomus tumors had thrombocytopenia as a result of platelet sequestration (i.e., Kasabach-Merritt syndrome). Malignant glomus tumors, or glomangiosarcomas, are extremely rare and usually represent a locally infiltrative malignancy. However, metastases do occur and are usually fatal. Sex Solitary glomus tumors, particularly subungual lesions, are more common in females than in males. Multiple lesions are slightly more common in males.

Age Solitary glomus tumors are more frequent in adults than in others. Multiple glomus tumors develop 11–15 years earlier than single lesions; about one third of the cases of multiple tumors occur in those younger than 20 years. Congenital glomus tumors are rare; they are plaquelike in appearance and are considered a variant of multiple glomus tumors. Malignant glomus tumors Malignant glomus tumors, histologically and/or clinically are exceedingly rare. Criteria for the diagnosis of malignancy in glomus tumors are: Tumor size of more than 2 centimeters and subfascial or visceral location. Atypical mitotic figures. Marked nuclear atypia and any level of mitotic activity. Pericytes of Zimmerman Malignant glomus tumors have been subdivided into three categories based on their histologic appearance: locally infiltrative glomus tumors (LIGT), glomangiosarcomas arising in benign glomus tumors (GABG), and glomangiosarcomas arising de novo (GADN). A few cases of malignant glomus tumors have been reported; however, they are usually only locally invasive, and metastases are exceedingly rare. Brathwaite et al. in 1996 reported widespread metastases of a malignant glomus tumor involving the skin, lungs, jejunum, liver, spleen, and lymph nodes. Another report of a malignant glomus tumor with metastases is that of Watanabe et al., who reported a cutaneous malignant glomus tumor with widespread metastases.A few other cases of malignant glomus tumors have been reported in the literature usually occur in the older age group, and have been described at several locations, primarily the soft tissues and gastrointestinal tracts. In 2011, Lamba G et al. reported the first case of malignant glomus tumor arising from the kidneys. Treatment Surgical excision is the preferred method of treatment for benign glomus tumors.

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