대한흉부영상의학회 Weekly Chest Cases

Case No : 1402 Date 2024-09-02

Courtesy of Jiyoung Song, Ji Young Lee, Woo Hyeon Lim / Seoul National University Hospital
Age/Sex 39 / F
Chief Complaintincidental finding, never smoker

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Figure 5

Diagnosis With Brief Discussion

Diagnosis: Pulmonary epithelioid hemangioendothelioma
Radiologic Findings: Fig 1: Chest PA shows multiple small nodules in both lungs.
Figs 2-4: Axial CT images with mediastinal and lung window settings reveal poorly enhancing nodules in both lungs that have grown slowly over a 2-year interval.
Fig 5: Axial PET/CT image shows multiple mildly hypermetabolic nodules in both lungs (SUVmax 2.9).
Brief Review: Pulmonary epithelioid hemangioendothelioma (PEH) is a rare, low-grade malignant vascular neoplasm of the lung. While epithelioid hemangioendothelioma can occur in various body sites and metastasize to the viscera, bones, and soft tissues, the most common sites of involvement are the liver (21% of patients), bone (14%), and lung (12%).

Clinical Presentation: PEH typically manifests as multiple bilateral lung nodules, often discovered incidentally in middle-aged women, with a mean patient age of 40 years. Symptomatic patients may experience chest tightness, shortness of breath, and difficulty breathing after exertion.

Imaging Characteristics: PEH usually presents as multiple well-defined nodules scattered throughout the lungs. Solitary lesions are rare, and nodule diameters are typically 1–2 cm, although diameters >5 cm have been reported. Calcifications and ossifications may occasionally be observed in the lesions, often presenting as benign patterns such as central or popcorn-like calcification. If the lesions invade the pleura, changes such as pleural thickening and effusion may occur. PET/CT imaging often reveals mildly hypermetabolic nodules with an average SUVmax of about 3.0, though some nodules can be non-FDG avid. The metabolic activity is generally lower compared to more aggressive malignancies.

Histopathology: Histologically, PEH is characterized by epithelioid endothelial cells arranged in trabecular or nested patterns. The tumor exhibits mild to moderate atypia with a low mitotic rate. Some tumor nodules may show acellular zones accompanied by coagulation necrosis, calcification, and ossification. Immunohistochemistry often reveals positivity for endothelial markers such as CD31, CD34, factor VIII, Friend leukemia integration 1 transcription factor, Ulex europaeus agglutinin type 1, and FKBP12.

Management and Prognosis: Treatment strategies for PEH vary and can include surgical resection, radiotherapy, chemotherapy, or targeted therapy, depending on the tumor's extent, tumor growth, involved organs, and the patient's overall health. For asymptomatic patients with diffuse lesions, watchful waiting is a viable option, and spontaneous regression has been reported. Prognosis varies widely but is generally favorable compared to more aggressive lung malignancies, with many patients achieving long-term survival. The average survival time for patients with asymptomatic pulmonary nodules is approximately 15 years, and it can exceed 25 years in the best cases. Patients who undergo complete surgical removal of lung lesions often experience long remissions or even cures. However, regular follow-up is crucial to monitor for potential recurrence or progression.
References: Frota Lima, Livia Maria et al. “Epithelioid hemangioendothelioma: evaluation by 18F-FDG PET/CT.” American journal of nuclear medicine and molecular imaging vol. 11,2 77-86. 15 Apr. 2021

Jang, Jong Keon et al. “A Review of the Spectrum of Imaging Manifestations of Epithelioid Hemangioendothelioma.” AJR. American journal of roentgenology vol. 215,5 (2020): 1290-1298. doi:10.2214/AJR.20.22876

Shao, Jinchen, and Jie Zhang. “Clinicopathological characteristics of pulmonary epithelioid hemangioendothelioma: A report of four cases and review of the literature.” Oncology letters vol. 8,6 (2014): 2517-2522. doi:10.3892/ol.2014.2566
Keywords

No. of Applicants : 59

▶ Correct Answer : 25/59, 42.4%

- Ishikawa Matto Central Hospital , Japan MANABU AKIMOTO
- Saitama-Sekishinkai Hosptal , Japan MIHOKO YAMAZAKI
- McGill University Health Center , Canada ALEXANDRE SEMIONOV
- , Korea (South) DONG-HO BANG
- Healthy Longevity Medical Center , Japan SHIN-ICHI CHO
- Vita Hospital , Brazil DIOGO LAGO PINHEIRO
- Other , Korea (South) SEONGSU KANG
- Oita University, Faculty of Medicine , Japan FUMITO OKADA
- University of Yamanashi , Japan TAKAAKI HASHIMOTO
- Osaka University , Japan AKINORI HATA
- The University of Tokyo Hospital , Japan TOSHIHIRO FURUTA
- , Japan YOSHIKI ISHII
- Narayana Multispeciality Hospital Jaipur Rajasthan , India JAINENDRA JAIN
- Dong-A University, College of Medicine , Korea (South) KI-NAM LEE
- , Korea (South) HEONSEOK LEE
- Jichi Medical University, School of Medicine , Japan MITSURU MATSUKI
- University of Tsukuba, Dept of Radiology , Japan MANABU MINAMI
- Osaka metropolitan university Hospital , Japan TATSUSHI OURA
- TB centre kasaragod. , India rikhy krishnan
- Yonsei University,Severance Hospital , Korea (South) SEO BUM CHO
- Kantou Rousai Hospital , Japan KAORU SUMIDA
- Toyota Kosei Hospital , Japan YUKI HAYASHI
- The Catholic University of Korea Yoeuido St. Mary , Korea (South) CHAWOONG JEON
- the first affiliatited hospital of nanjing medical univercity , China HAI XU
- Jiangsu province hospital , China WANGJIAN ZHA

▶ Correct Answer as Differential Diagnosis : 7/59, 11.9%

- Shiga University of Medical Science , Japan AKITOSHI INOUE
- Kyoto University , Japan AKIHIKO SAKATA
- Kyoto City Hospital , Japan YUSUKE UTSUNOMIYA
- Seoul Medical Center , Korea (South) HYUK GI HONG
- , Japan SHUNJIRO NOGUCHI
- Shiga General Hospital , Japan YUSAKU MORIBATA
- Mie university , Japan SHIKO OKABE

▶ Semi-Correct Answer : 1/59, 1.7%

- GHICL , France MANUEL TOLEDANO

대한흉부영상의학회 Korean Society of Thoracic Radiology

Archive of Old Cases

Case No : 1402 Date 2024-09-02

Discussion

No. of Applicants : 59