2 to 0.4 cm in diameter. Histopathological study of the sections from the MK-0518 mouse nodules showed a tumoral tissue, extending from alveolus to alveolus. Moreover, the nuclei were bland looking and round to oval, with foci of cytoplasmic vacuolization. Mitoses were absent, and there was no necrosis (figure 2a, ​,bb,​, c, c, ​,d).d). Immunohistochemistry revealed reactive CD31 (figure 3a, ​,b)b) and CD34 as well as non-reactive TTF-1 and cytokeratin. The proliferative index (Ki-67) was about 10%. The diagnosis of primary EHE was made, because all the other body

parts, including soft tissue, bone, and brain, were completely unremarkable. Figure 2 Histopathological sections, showing multiple small and large Inhibitors,research,lifescience,medical nodules of the tumoral tissue (a). High power, illustrating vacuolated cells with intracytoplasmic vacuoles (b,c,d). Figure 3 Immunohistochemical staining

of the tumoral tissue, showing reactive CD31 (low power: Inhibitors,research,lifescience,medical a), high power: b) MAID (Mesna, Doxorubicin, Ifosfamide, and Dacarbazine) regimen was started for the patient. Six months on, she is well and under follow-up. Discussion EHE is a rare tumor originating from the vascular endothelial cells and characterized by epithelioid histological feature.1 The first description of EHE Inhibitors,research,lifescience,medical in the lung tissue was by Dail and Liebow4 in 1975 under the name of intravascular bronchiolar and alveolar pulmonary tumor. It was initially considered as an aggressive cancer with Inhibitors,research,lifescience,medical vessel invasion.5 The term “epithelioid hemangioendothelioma” was first used by Enzinger and Weiss in 1988. Now it is recognized that the true nature of this neoplasm is from the endothelial cells with a low-grade to borderline malignant potential.6 More than 75% of the cases of EHE are in female patients,6 and there is a wide age range from 7 to 83 years.1 Most of the reported cases have been asymptomatic and incidentally Inhibitors,research,lifescience,medical diagnosed; however, nonspecific symptoms such as chest pain, dyspnea, and productive cough have also been reported.1,6 Hemoptysis

has been very rarely reported, and even extensive hemorrhage from has been reported as a cause of death.7 Our patient was a 61-year-old female with a prolonged history of hemoptysis, and she underwent surgery with extensive hemorrhage. The radiological features of the EHE in the lung can be presented as multiple pulmonary nodules, multiple pulmonary reticulonodular opacities, or diffuse infiltrative pleural thickening.8 The size of the nodules is commonly less than 1 cm, and they are mostly located near the medium-sized bronchial vessels.1 The diagnosis of EHE is always based on the pathological examination of the tissue.6 Nevertheless, according to the previous reports, most often the bronchial biopsies and the bronchoalveolar lavage are not informative. The diagnosis is generally made on a surgical pulmonary biopsy.9 Our case was also diagnosed based on the surgical specimen.