a 63-year - old white female patient with morbid obesity ( body mass index of 82.6 ) , chronic bilateral lower extremity lymphedema , chronic kidney disease , congestive heart failure , hypertension , type 2 diabetes , hypothyroidism , glaucoma , gastroesophageal reflux disease , chronic obstructive pulmonary disease , asthma , obesity hypoventilation syndrome and depression , presented to the hospital with shortness of breath and fatigue . she had been living in a nursing home and was completely immobile for the last 9 years secondary to both morbid obesity and lymphedema . the patient did not have a history of lower extremity surgery , trauma , or infection . the initial diagnosis by the internal medicine and dermatology department was cellulitis of the lower extremities . a lower extremity ultrasound was performed which showed multiple masses in the left inner upper calf , with solid and cystic components , subcutaneous edema , and necrosis . the pathology of the punch biopsies revealed angiosarcoma , present at deep and peripheral tissue edges . immunohistochemical studies revealed that the tumor cells were positive for cd31 , fli-1 with a high ki-67 proliferation rate ( up to 30% of total tumor cells ) ( fig . based on the morphology , immunoprofile , and clinical presentation , the patient was diagnosed with stewart - treves syndrome ( sts ) . due to the patient 's weight and size , additional staging workup , including computerized axial tomography , based on the patient 's poor baseline performance status and history of cardiac and renal disease , she was not eligible for the standard cardiotoxic and nephrotoxic chemotherapeutic agents required for treatment . approximately 1 month after the biopsy results were obtained , the patient developed septic shock and multiorgan failure that resulted in her death . it is defined as the association between chronic lymphedema and angiosarcoma [ 1 , 2 ] . it was originally described in women who developed lymphedema as a result of axillary lymph node dissection associated with mastectomy for breast cancer . the presence of this syndrome significantly worsens the outcome of patients with breast cancer [ 2 , 3 ] . loewenstein in 1906 described angiosarcoma in the extremity of a patient affected by severe posttraumatic lymphedema for 5 years . however , the first description in the english literature is attributed to kettle in 1918 , who described angiosarcoma in the leg of a 44-year - old patient with congenital lymphedema . in 1948 , norman treves , associate professor of surgery , both from the cornell university medical college , new york , n.y . elephantiasis chirurgica. prior to this report , such cases went unreported since the clinical findings were erroneously attributed to diffuse and recurrent inoperable cutaneous manifestations of breast cancer . while most commonly associated with breast cancer , this syndrome can be broadly applied to lymphangiosarcoma , which develops from chronic lymphatic obstruction , either congenital or acquired . initially , electron microscopic and immunohistological studies revealed the origin of this cancer to be from blood vessel rather than lymphatic endothelium , thereby classifying the tumor as a hemangiosarcoma . however , more recent immunohistochemical studies confirmed the original description , confirming the tumor as a lymphangiosarcoma [ 3 , 5 ] . there are approximately 400 cases of sts reported in the literature , most in postmastectomy patients who are predominantly women . the incidence of this disease is very low ( between 0.07 and 0.45% of patients survive at least 5 years postradical mastectomy ) . there are also case reports of patients who developed sts on closed shunts in renal transplant and chronic kidney disease . it has not been shown to be more prevalent in patients with aids or any other immunodeficiency disorders , as compared with kaposi 's sarcoma ( ks ) . the peak age of presentation of angiosarcoma is between 65 and 70 years , with an average patient age of 68.8 years at diagnosis for breast cancer - associated patients . the incidence of sts has notably declined secondary to the improvement of operative techniques in breast cancer as well as radiation therapy techniques and the development of novel chemotherapy agents . in addition , the incidence of chronic lymphedema after breast cancer treatments has been reduced from 40 to 4% [ 3 , 8 ] . among patients receiving radiation therapy , patients usually have a significant history for breast cancer and radical mastectomy , usually 515 years before sarcoma presentation . there are many causes of lymphedema , such as trauma , infectious ( filariasis ) , idiopathic acquired lymphoma , venous stasis , morbid obesity , leg ulcerations , lymphoma , and surgery of the groin , legs , or pelvis . one type of lymphedema , called massive localized lymphedema , is associated with obesity , and its incidence is rising secondary to the epidemic of obesity in the western society . only nine cases of angiosarcoma arising in the setting of massive localized lymphedema have been reported [ 6 , 9 , 10 ] . these are acquired forms of lymphedema , but there can also be congenital lymphedema . notably , chronic lymphedema caused by cardiac , hepatic , or renal disease is not associated with sts . the mechanism by which some forms of chronic lymphedema can induce angiosarcoma is unknown and controversial . one theory is that chronic lymphedema causes local immunodeficiency , therefore permitting oncogenesis [ 2 , 3 , 6 ] . buildup of protein - rich interstitial fluid alters the local immune response within the affected limb , stimulating lymphangiogenesis and the development of collateral vessels . in addition , the fluids in the lymphatic channels are rich in growth factors . supporting the immunodeficiency hypothesis is the observation that , in 1960 , a homograft skin transplant on a lymphedematous arm survived much longer than homograft skin transplanted to healthy arms . furthermore , there have been case reports of patients who developed this syndrome while taking chronic systemic immunosuppressive medications , chemotherapy , and in patients with acquired immunodeficiency syndrome . this raises the possibility that systemic , not only local immunosuppression , may have a role in the development of lymphangiosarcoma [ 6 , 7 ] . interestingly , some authors postulate that mutations in the dna repair genes brca1 and brca2 predispose to angiosarcomas after treatment for breast cancer . three phases in the development of sts have been described : ( 1 ) prolonged lymphedema , ( 2 ) angiomatosis , and subsequently ( 3 ) angiosarcoma . prolonged lymphedema ( lymphostasis ) is observed in ks as well as angiosarcoma , resulting in localized immunosuppression and vascular oncogenesis in the presence of human herpesvirus 8 ( hhv-8 ) infections and immunosuppression . lymphangiosarcoma and ks have been reported to occur together in a patient receiving immunosuppressive treatment for a kidney transplant . additionally , lymphedema has also been described in other cutaneous malignancies including melanoma , basal cell carcinoma , squamous cell carcinoma , merkel cell carcinoma , and cutaneous lymphomas [ 6 , 11 ] . the histologic findings of angiosarcoma in sts show a proliferation of irregular anastomosing vascular channels that dissect dermal collagen . the malignant endothelial cells lining these channels are hyperchromatic and pleomorphic with macronucleoli and frequent mitosis . the tumor cells are round to ovoid with a predominantly epithelioid cytomorphology and often project into the lumen of the vessels creating a the overlying epidermis may be acanthotic , hyperkeratotic , or atrophic , with or without proliferation of reticular fibers in the dermis [ 3 , 14 ] . interestingly , the angiosarcomas in sts present heterogeneous morphology with areas dominated by hemangiosarcoma and lymphangiosarcoma structures . . not all malignant endothelial cells will be positive for this marker ; thus , a panel of immunohistochemical stains should be used to avoid false - negatives . diagnostically helpful stains include cd31 , cd34 , fli-1 , von willebrand factor , and factor viii [ 2 , 3 , 5 , 7 ] . in addition , numerous lymphatic associated antibodies have been developed , including podoplanin ( d240 ) , lymphatic vessel endothelial hyaluronan receptor-1 ( lyve-1 ) , prospero homeobox protein 1 , and vascular endothelial growth factor receptor 3 ( vegfr-3 ) [ 2 , 3 , 6 ] . thanks to these endothelial lymphatic markers , a possible relationship between ks and sts was made because the markers were present in both types of sarcomas . nevertheless , examination of sts specimens with electronic microscopy further supports lymphatic origin by identifying a complete basal lamina surrounding the malignant cells . additionally , electronic microscopy has identified pinocytosis , intracellular junctions , and cytoplasmic intermediate filaments , as well as weiber - palade bodies , storage granules , and erythrophagocytosis . these ultrastructural features oppose findings seen in tumors of vascular origin and support the classification as a tumor of lymphatic origin [ 3 , 11 , 13 ] . usually , this lymphedema occurs without a history of complications , such as thrombosis or infection . lymphangiosarcomas are much more frequent in the upper extremity , 90% of cases present like this . moreover , lymphangiosarcomas are present in the ipsilateral side in which the radical mastectomy was performed and the lymphedema developed . the lymphedema in the upper extremities gradually extends from arm to forearm and dorsal aspects of the hand and fingers . local discomfort develops when the skin distends , but this occurs usually in advanced stages of the syndrome . the initial lesion includes either a palpable subcutaneous mass or a poorly healing eschar with recurrent bleeding . in more advanced stages , multiple reddish blue macules or nodules develop and may become polypoid . as the lesions progress , the overlying atrophic skin becomes ulcerated , leading to infection and bleeding . necrosis of the skin can also happen . if left untreated , extensive cutaneous nodules appear and metastatic disease develops . the most common site of metastasis are the lungs , followed by liver , bone , soft - tissue structures and lymph nodes via the hematogenous route [ 2 , 3 , 10 , 15 ] . acquired angioedema , ecchymosis , pyogenic granuloma , lymphangiectasia , angioendotheliomatosis , benign lymphangioendothelioma , lymphangioma , melanoma , and metastatic carcinoma to the skin should be considered . in addition , telangiectatic metastatic breast disease to the skin should be considered [ 3 , 15 ] . this is a very confusing disorder because it can also develop in the presence of lymphedema , and the skin lesions and histological findings can be similar . ks differs from sts because it does not require the presence of lymphedema for its development . immunohistochemical testing for the presence of hhv-8 is the primary way to distinguish sts from ks . some authors hypothesize that there may be a virus involved with the pathogenesis of sts [ 3 , 12 ] . in 1959 , mcconnell and haslam proposed a system for the staging of postmastectomy lymphangiosarcoma , which divides this disease in 3 stages . histological grading is not used in staging because angiosarcomas are high - grade tumors by definition . imaging studies can be used for staging purposes , such as ct , magnetic resonance , and radiography . magnetic resonance is an excellent study for evaluation of the local progression of the disease , but it has limited ability to delineating tumor margins . chest radiography and ct can be used to identify pulmonary metastases and pleural effusion [ 3 , 10 ] . for the demonstration of subcutaneous spread and planning of a surgical procedure , it is recommended early amputation / disarticulation or wide local excision of the affected limb in localized disease , which offers the best chance of long - term survival . even when a 23-cm wide margin of resection is obtained at the primary surgery , a high local recurrence rate is observed . the report by grobmyer et al .   identified no significant difference in the survival of patients treated with chemotherapy versus radiation therapy . long - term survivorship after chemotherapy / radiation is reported in case reports , but the overall results are poor [ 1 , 2 , 3 , 6 , 13 , 14 , 15 ] . causes of long - term survivorship of sts could in fact be secondary to undiagnosed cutaneous nodular ks . chemotherapy agents used in this disease includes 5-fluorouracil , methotrexate , bleomycin , and/or a combination of actinomycin d , vincristine , doxorubicin , cyclophosphamide , and/or dacarbazine . even with these treatment therapies , local recurrence and metastasis is high [ 2 , 3 , 4 , 11 , 14 ] . treatment with immunotherapy has been demonstrated to be favorable as a palliative treatment for the management of pleural effusions caused by metastatic disease [ 11 , 14 ] . it has been hypothesized that blocking both the lymphangiogenesis and hemangiogenesis pathways may inhibit rapid growth and metastatic spread , but more studies are needed [ 2 , 8 ] . the overall prognosis of sts is poor , with a high rate of local recurrence and metastatic disease [ 2 , 3 , 16 ] . the course of the disease can be complicated with recurrent erysipelas and deep venous thrombosis of the affected limb . the median survival is 2.5 years after diagnosis , with most patients dying from metastatic disease within 2 years [ 2 , 3 , 4 , 6 ] . these include treatment of the chronic lymphedema , weight loss , pressure garments , physiotherapy , compressive devices , microsurgery , and laser therapy [ 3 , 4 , 6 , 15 ] . all reasonable efforts to obtain consent for publication from the patient 's next of kin failed , as they were untraceable . there is no reason to believe that the patient would have objected to publication and it is not felt that anyone who knew the patient would be able to identify her from the published article .
the stewart - treves syndrome is a rare and deadly entity , which is defined as angiosarcoma arising in the setting of chronic lymphedema . 
 it typically presents in women who develop lymphedema in the upper extremity secondary to axillary lymph node dissection for breast cancer surgery . 
 it is extremely uncommon in the lower extremities as a result of idiopathic chronic lymphedema . here , we present the case of a 63-year - old female patient with idiopathic chronic lymphedema of the lower extremities having morbid obesity ( bmi 82.6 ) and multiple comorbidities . 
 she developed multiple confluent , hemorrhagic and necrotic elevated purple - black papules in the lower extremities , for which the initial diagnosis was cellulitis . because there was no improvement with antibiotics , a lower extremity ultrasound and biopsy 
 was performed which showed multiple masses in the left inner upper calf with solid and cystic components . 
 the pathology results of the punch biopsies were consistent with angiosarcoma . 
 immunohistochemical studies revealed positivity for cd31 , fli-1 , and a high ki-67 proliferation rate . because of the patient 's weight and medical comorbidities , no further extensive diagnostic tests were performed to detect metastatic disease , and because of contraindications , no further medical treatment was provided . 
 the patient subsequently died 1 month after diagnosis .