To appreciate why this case has drawn attention, it helps to understand what angiosarcoma actually is. The disease arises from endothelial cells, the flat cells that line the interior surface of blood vessels and lymphatic channels. When these cells turn malignant, they proliferate into wildly disorganized networks of immature, blood-filled channels, solid sheets of atypical cells, or nodular masses that infiltrate surrounding tissue. Angiosarcoma is aggressive by nature, with an early tendency to metastasize to distant organs, and it accounts for only a small fraction of an already uncommon category of cancers. Sarcomas as a whole represent roughly one percent of adult malignancies, and angiosarcomas make up only about two percent of those, which places this tumor among the rarest cancers that oncologists ever confront.

Most cases of cutaneous angiosarcoma do not appear out of nowhere. The two dominant risk factors are chronic lymphedema, the persistent swelling that occurs when lymphatic drainage is blocked, and prior radiotherapy, which can damage vascular tissue in ways that promote malignant transformation years later. Beyond those, researchers have linked angiosarcoma to familial syndromes such as neurofibromatosis and Klippel-Trenaunay syndrome, and to environmental carcinogens including vinyl chloride, thorotrast, arsenic, radium, and androgenic steroids. The tumor shows a predilection for the head and neck, particularly the scalp of elderly men, where sun-damaged skin and abundant superficial vasculature may contribute. When angiosarcoma does strike the male genital system, whether at the base of the penis, the testes, the spermatic cord, or the scrotum, it is a genuine rarity, with only a handful of cases ever documented in the medical literature.

The Egyptian patient’s story began when he arrived at the surgical oncology outpatient clinic after having undergone an excisional biopsy of a scrotal lesion at another facility, where microscopic examination had already suggested angiosarcoma. He had no relevant medical or surgical history, no family history of note, and no occupational or environmental exposure to known carcinogens. On examination, clinicians found a three-centimeter residual ulcer on the right side of his scrotum, along with an atrophic testicle underneath. The absence of every classic risk factor made the diagnosis all the more puzzling, and it prompted the team to conduct a thorough diagnostic workup that combined imaging, histopathology, and immunohistochemistry.

Ultrasound of the scrotum revealed a well-defined, heterogeneous oval mass in the right hemiscrotum measuring 46 by 43 by 38 millimeters, clearly separable from the testicle, which itself appeared normal in size and echogenicity. Post-contrast magnetic resonance imaging added crucial detail: the right testicle was small with an irregular outline and showed signal characteristics consistent with infarction, meaning it had lost its blood supply, while the scrotal wall displayed diffuse thickening and enhancement suggestive of post-operative or inflammatory change. Enlarged right inguinal lymph nodes were also identified, though computed tomography of the chest, abdomen, and pelvis found no evidence of distant metastasis, a critical finding for staging and treatment planning.

The definitive diagnosis, however, rested on the microscope. Pathologists at Mansoura University revised the original biopsy slides and paraffin blocks and found malignant tumor tissue arranged in variable-sized sheets, with multiple vascular spaces lined by large, atypical cells showing moderate nuclear atypia and prominent nucleoli. Wide areas of necrosis were present, and mitotic figures, including atypical forms, were frequent, all hallmarks of a high-grade malignancy. The tumor displayed the classic architectural pattern of angiosarcoma: a proliferation of anastomosing, small, immature blood-filled spaces, with some focal solid areas, lined by plump endothelial cells set in a fibromyxoid stroma.

Immunohistochemistry, the technique that uses antibodies to detect specific proteins in tissue sections, sealed the diagnosis. The tumor cells showed diffuse, strong immunoreactivity for ERG, a transcription factor regarded as a sensitive marker of vascular endothelial differentiation, and focal positivity for CD31, another endothelial marker. The proliferation index, measured by Ki-67 staining, was strikingly high, with 60 to 70 percent of tumor cells staining positive, indicating rapid cell division. Just as important were the negative results: the tumor did not react to stains for cytokeratin, CD34, desmin, S100, smooth muscle actin, or human herpesvirus 8, which helped exclude carcinomas, other sarcoma subtypes, melanoma, and Kaposi sarcoma from consideration. Together, the morphology and immunoprofile confirmed cutaneous angiosarcoma of the scrotum.

Management was decided at a multidisciplinary sarcoma meeting, where the team opted for wide local excision. The patient underwent removal of the right hemiscrotum, including the atrophied right testicle, through a scrotal approach, and was discharged the following day. Post-operative pathology delivered welcome news: no residual tumor tissue was found in the specimen. Over eleven months of follow-up, with regular three-monthly visits involving clinical examination, basic laboratory tests, and chest imaging, the patient has shown no local recurrence and no distant metastasis, an outcome that stands in contrast to the generally dismal prognosis associated with cutaneous angiosarcoma.

The case is remarkable from several angles at once. Scrotal tumors are far more likely to be squamous cell carcinomas than angiosarcomas. Cutaneous angiosarcoma itself rarely presents in the genital skin. De novo angiosarcoma, arising without lymphedema, radiation, or a genetic syndrome, is exceedingly uncommon anywhere in the body. And this patient represents only the fifth reported case of cutaneous scrotal angiosarcoma in the literature, with previous cases having been tied to identifiable factors such as neurofibromatosis or prior radiation therapy for other cancers. The authors speculate that an unknown risk factor, perhaps a genetic predisposition or an environmental exposure not yet recognized, may underlie this tumor, opening a line of inquiry for future research.

The broader lesson for clinical practice is one of vigilance. Scrotal lesions are common in everyday practice and can range from benign cysts and inflammatory conditions to hemangiomas, lymphangiomas, and malignant tumors, so distinguishing benign from malignant disease is paramount for proper treatment. Because cutaneous angiosarcoma follows an aggressive course with early metastatic potential, and because surgery remains the only modality associated with improved survival, according to a large analysis of 764 patients, delayed diagnosis can be fatal. The Mansoura team argues that any suspicious cutaneous manifestation on the scrotum should prompt consideration of angiosarcoma, even in patients with no risk factors whatsoever. They also call for improved diagnostic criteria, standardized treatment protocols, and studies of adjuvant options such as immunotherapy and targeted therapy, along with long-term follow-up research to clarify recurrence patterns and optimize surveillance. For now, this single unusual case serves as a reminder that in oncology, rarity is not the same as impossibility, and that the rarest presentations often teach the most enduring lessons.

Subject of Research: A rare case of primary cutaneous angiosarcoma of the scrotum arising without identifiable risk factors

Article Title: Primary cutaneous scrotal angiosarcoma: a case report and literature review

Article References: Hamdy, O., Ragab, D., Farouk, B., Allam, M. M., Asy, R. A., Saleh, G. A., & Mohamed, M. A. (2024). Primary cutaneous scrotal angiosarcoma: a case report and literature review. Clinical Cancer Bulletin, 3(1), Article 20. https://doi.org/10.1007/s44272-024-00025-9

Image Credits: AI Generated

DOI: 10.1007/s44272-024-00025-9

Keywords: angiosarcoma, scrotal tumor, cutaneous angiosarcoma, case report, immunohistochemistry, ERG, CD31, sarcoma, vascular tumor, surgical oncology, rare cancer, Mansoura University

The patient’s story began in September 2019, when she first noticed a small, mobile mass in her left breast measuring roughly 2 by 1 by 1 centimeters. The lump caused no tenderness, no skin changes, and no nipple discharge, so she initially ignored it. Two months later, at another hospital, mammography and breast color Doppler ultrasound both classified the lesion as Breast Imaging Reporting and Data System category III—a designation implying a probably benign finding with less than a 2 percent risk of malignancy—and recommended routine follow-up. Over the following three months, however, the mass grew dramatically, reaching approximately 4 by 3 by 2 centimeters and occasionally becoming painful. That rapid enlargement prompted her admission to the reporting hospital in March 2020, where physical examination found a smooth, moderately firm, mobile mass without skin ulceration, nipple retraction, or enlarged lymph nodes in the armpits.

The imaging workup revealed a striking contradiction. Mammography at the outside hospital had graded the lesion BI-RADS 3, but repeat ultrasound at the new institution upgraded it to BI-RADS 4A, indicating a small but real suspicion of malignancy of roughly 2 to 10 percent. The ultrasound showed a solid, irregular, lobulated mass at the 11 o’clock position of the left breast, containing strip-like blood flow signals with low-resistance arterial waveforms—a vascular pattern that would later prove telling. Chest computed tomography confirmed a mound-shaped mass in the upper inner quadrant with an unclear boundary on plain scan. Meanwhile, laboratory results were entirely unremarkable: blood counts, liver and kidney function, and coagulation were normal, and the tumor markers CEA, CA 15-3, CA 125, and CA 19-9 all sat comfortably within reference ranges. The team noted that breast angiosarcomas frequently produce negative results on routine malignant tumor markers, rendering these tests of extremely low diagnostic value in such cases.

Reconciling the discordant imaging grades against current standards proved decisive in shaping the diagnostic pathway. According to the fifth edition of the American College of Radiology BI-RADS criteria, the 2024 National Comprehensive Cancer Network breast guidelines, and the 2021 Chinese Society of Breast Surgery fibroadenoma guideline, the combined clinical and imaging picture did not meet formal indications for contrast-enhanced breast MRI, bone scintigraphy, or percutaneous core needle biopsy. Those tools are reserved for high-risk patients, radiologically indeterminate lesions with definite malignant suspicion, or preoperative staging of confirmed cancers—not for discordant low-grade BI-RADS 4A lesions accompanied by benign mammographic findings. The clinicians therefore concluded the lesion was highly suggestive of a benign fibroadenoma and recommended elective surgical resection, a decision that conformed to guidelines but, as they later acknowledged, failed to account specifically for the lesion’s rapid growth.

Surgery took place on March 11, 2020, under general anesthesia, and it was here that the case pivoted. Intraoperative frozen section pathology suggested a spindle cell tumor tending toward a vascular origin, with definitive classification awaiting immunohistochemistry. Because the team had rarely encountered such lesions, and because committing to a radical operation on an uncertain diagnosis carried obvious risks, they consulted the patient’s family and made the unusual decision to temporarily suspend the surgery. Final pathology returned on March 17: the excised nodule, about 3.5 by 2.5 by 1.8 centimeters, was packed with anastomosing slit-like vascular channels infiltrating breast lobules and fat, lined by a single layer of endothelial cells showing mild nuclear atypia and occasional mitoses. Immunohistochemistry showed strong positivity for the endothelial markers CD34, CD31, and FLT-1, along with vimentin and smooth muscle actin, while epithelial markers EMA and broad-spectrum cytokeratins were negative. The Ki-67 proliferation index was 25 percent. The diagnosis was low-grade angiosarcoma.

To be certain, the slides were sent for outside consultation at a higher-level hospital, which returned on March 20 with a confirmatory and slightly more concerning picture: part of the tumor showed the mild, well-formed vascular pattern, but other areas were solid, densely cellular, and pleomorphic with mitotic figures, extensive hemorrhage, and necrosis. The consultants recommended optional molecular testing for c-Myc, KDR, and VEGFR2—markers mainly useful for distinguishing primary from radiation-associated secondary angiosarcoma—though the team ultimately judged these unnecessary given the clear histopathological diagnosis. After a hospital-wide multidisciplinary team discussion, the patient underwent completion resection of the remaining left breast tissue plus sentinel lymph node biopsy on March 23. Frozen section confirmed an R0 resection with clear microscopic margins and no sentinel node metastasis, and final pathology found no residual cancer in the surrounding breast, nipple, skin, or basal margin, with zero of three sentinel nodes involved.

The staging and treatment decisions reflected the peculiar biology of this tumor. Under the eighth edition of the AJCC staging system, the disease was classified as stage I (T1N0M0). Unlike conventional breast carcinoma, which spreads chiefly through lymphatic channels, primary breast angiosarcoma metastasizes predominantly through the bloodstream, seeding the liver, lungs, bone, and brain early, while regional lymph node involvement is extremely rare. Routine axillary lymph node dissection is therefore not recommended, and the team performed only a sentinel node biopsy for accurate staging, sparing the patient unnecessary surgical trauma. Beginning April 3, 2020, she received eight cycles of adjuvant chemotherapy—four of doxorubicin plus cyclophosphamide followed by four of paclitaxel—completed without significant adverse reactions by the end of July 2020.

The prognosis data assembled in the report underscore why vigilance matters. Secondary angiosarcoma of the breast, which typically arises after radiotherapy for breast cancer or in the setting of chronic lymphedema known as Stewart-Treves syndrome, carries a five-year overall survival of roughly 38 percent with a recurrence-free survival of about 43 months. Primary breast angiosarcoma fares somewhat better, with a five-year overall survival near 49 percent and recurrence-free survival of about 44 months, with outcomes tied to stage, histological grade, and tumor size. Diagnosis remains the hardest part: mammography yields false negatives in roughly a third of patients because of dense glandular tissue, ultrasound lacks specificity despite showing heterogeneous masses and increased blood flow, and MRI—considered the most useful non-invasive modality—reveals heterogeneous signals and avid contrast enhancement reflecting the tumor’s rich vascularity. Core needle biopsy, the usual route to preoperative diagnosis, frequently returns false negatives because of bleeding risk and marked tumor heterogeneity, meaning most cases are only confirmed after surgery.

Emerging evidence is beginning to reshape treatment thinking for this orphan disease. A meta-analysis by Skarentzos and colleagues found that adjuvant chemotherapy significantly improved survival in primary breast angiosarcoma, with a hazard ratio of 0.11, while radiotherapy showed no survival benefit. Anthracycline-, ifosfamide-, and paclitaxel-containing regimens are considered the most effective, though the disease’s rarity means evidence rests on small series and case reports rather than large trials. Genomic research is opening new doors: the Angiosarcoma Project, a patient-partnered genomic study, has suggested that inhibitors of the phosphatidylinositol-3-kinase catalytic alpha subunit could become targeted therapeutic options, and next-generation sequencing may eventually identify actionable alterations in tumors like this one.

Follow-up tells the story’s encouraging end. The patient was re-examined at one, three, and six months after surgery, then roughly every six months, with breast ultrasound, chest CT, abdominal and urinary tract ultrasound, blood counts, and tumor markers. As of November 5, 2025—more than five years after her diagnosis—she showed no sign of local recurrence or distant metastasis. The authors argue their case carries three broader lessons: that a rapidly growing, benign-appearing breast mass in a postmenopausal woman deserves heightened suspicion even when guidelines do not mandate advanced imaging; that suspending surgery when frozen section reveals something unexpected can preserve diagnostic accuracy and prevent undertreatment; and that multidisciplinary collaboration, staged surgery, and guideline-conformant individualized therapy can deliver excellent long-term outcomes even in a cancer this rare and this easy to miss.

Subject of Research: Primary breast angiosarcoma diagnosis and treatment in a postmenopausal woman

Article Title: Primary Mammary Angiosarcoma in a Postmenopausal Woman: A Case Report

Article References: Liu, T., Xu, Y., Wang, Q., Yu, S., Lin, H., Ye, Z., Zheng, Z., Yang, C., & Hong, T. (2026). Primary Mammary Angiosarcoma in a Postmenopausal Woman: A Case Report. Cancer Reports, 9(9), Article e70653. https://doi.org/10.1002/cnr2.70653

Image Credits: AI Generated

DOI: 10.1002/cnr2.70653

Keywords: breast angiosarcoma, primary breast angiosarcoma, postmenopausal, BI-RADS, fibroadenoma, frozen section pathology, immunohistochemistry, CD31, sentinel lymph node biopsy, adjuvant chemotherapy, R0 resection, rare cancer