What are perivascular epithelioid cell?

A family of rare tumors that form in the soft tissues of the stomach, intestines, lungs, female reproductive organs, and genitourinary organs. Most perivascular epithelioid cell tumors are benign (not cancer). They often occur in children with an inherited condition called tuberous sclerosis. Also called PEComa.

What causes PEComa?

Perivascular epithelioid cell tumors (PEComas) are rare tumors driven by tuberous sclerosis complex gene mutations causing up-regulation of mTOR.

Is PEComa malignant?

Perivascular epithelioid cell neoplasms (PEComa) are rare mesenchymal tumors that can occur in any part of the body and have unpredictable pathological behavior. They are usually benign, but may be malignant.

What is epithelioid neoplasm?

Epithelioid sarcoma is a rare, slow-growing type of soft tissue cancer. Most cases begin in the soft tissue under the skin of a finger, hand, forearm, lower leg or foot, though it can start in other areas of the body.

What is epithelioid angiomyolipoma?

Epithelioid angiomyolipoma is a rare tumor of mesenchymal tissue that has the potential for local invasion and disease progression. Diagnosis of EAML was confirmed by pathology and immunohistochemistry.

Is PEComa treatable?

Treatment and prognosis. PEComa is a rare neoplasm, and no standardized treatment has been established. Currently, surgery is the mainstay of treatment for primary PEComa at presentation, as well as for local recurrences and metastases, with the aim of obtaining clear resection margins.

Is PEComa genetic?

PEComas constitute a genetically diverse group that includes neoplasms harboring TFE3 gene rearrangements and those with TSC2 mutations, indicating alternative tumorigenic pathways.

How curable is soft tissue sarcoma?

Most people diagnosed with a soft tissue sarcoma are cured by surgery alone, if the tumor is low-grade; that means it is not likely to spread to other parts of the body. More aggressive sarcomas are harder to treat successfully.

Are epithelioid cells cancerous?

When an individual is exposed to asbestos fibers, epithelial cells can mutate and become cancerous. Epithelioid mesothelioma is the most common form of the disease. The cell type is found in about 70 – 80% of all mesothelioma cancer patients.

What is epithelioid cell granulomas?

Epithelioid granulomas are a feature of chronic cutaneous leishmaniasis and leishmania recidivans though they have also been described in around 30% of cases of acute leishmaniasis. Although most cases of nodular post kala azar dermal leishmaniasis are non-granulomatous, epithelioid granulomas are seen in some cases.

What is angiomyolipoma in the right kidney?

Angiomyolipoma of the kidney is a clonal neoplasm, apparently part of a family of neoplasms derived from perivascular epithelioid cells. Early angiomyolipomas are small nodules composed of HMB-45-reactive spindle cells in the renal capsule, cortex, or medulla.

What is perivascular epithelioid cell tumor?

Perivascular epithelioid cell tumors (PEComa) are low-grade mesenchymal tumors composed of histologically and immunohistochemically distinctive perivascular cells. 742-746 The PEComa family consists of entities such as angiomyolipoma, clear cell (“sugar”) tumor of the lung, and lymphangioleiomyoma.

Which markers are characteristic of perivascular epithelioid-cell tumors (PEComas)?

These lesions also express other markers of melanocytic differentiation as well as CD117 and CD10, but typically lack S100 and keratin expression. Perivascular epithelioid-cell tumors (PEComas) represent a group of neoplasms that characteristically show both smooth muscle and melanocytic differentiation.

What is the immunophenotype of epithelioid pectoral endometrial cancer (PEComa)?

Interestingly, PEComa are thought to be capable of modulating their immunophenotype according to morphology. For example, a PEComa with prominent spindle cell morphology expresses smooth muscle actin more strongly than HMB45. In contrast, a purely epithelioid PEComa displays HMB45 immunoreactivity and only focal actin positivity.