Journal of Pathology and Translational Medicine

Case Study

Pulmonary Arteriovenous Fistula: Clinical and Histologic Spectrum of Four Cases: Soomin Ahn, Joungho Han, Hong Kwan Kim, Tae Sung Kim; J Pathol Transl Med. 2016;50(5):390-393. Published online May 9, 2016; DOI: https://doi.org/10.4132/jptm.2016.04.18

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Pulmonary arteriovenous fistula (PAVF) is abnormally dilated vessels that provide a right-to-left shunt between pulmonary artery and pulmonary vein and is clinically divided into simple and complex type. Here, we report four cases of surgically resected sporadic PAVFs presenting various clinical and histologic spectrums. Cases 1 (a 57-old-female) and 2 (a 54-old-female) presented as incidentally identified single aneurysmal fistulas and the lesions were surgically removed without complication. On the other hand, case 3 (an 11-old-male) showed diffuse dilated vascular sacs involving both lungs and caused severe hemodynamic and pulmonary dysfunction. Embolization and surgical resection of the main lesion failed to relieve the symptoms. Case 4 (a 36-old-male) had a localized multiloculated cyst clinically mimicking congenital cystic adenomatoid malformation. Microscopically, the lesion consisted of dilated thick vessels, consistent with the diagnosis of fistulous arteriovenous malformation/hemangioma.

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Brief Case Report

A Rare Case of Thymic Gangliocytic Paraganglioma: Jung Wook Yang, Joungho Han, Hyun Woo Lee, Soo Youn Cho, Hong Kwan Kim; J Pathol Transl Med. 2016;50(2):165-167. Published online October 8, 2015; DOI: https://doi.org/10.4132/jptm.2015.07.15

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Case Report

Localized Primary Thymic Amyloidosis Presenting as a Mediastinal Mass: A Case Report.: Sang Yun Ha, Jae Jun Lee, Heejung Park, Joungho Han, Hong Kwan Kim, Kyung Soo Lee; Korean J Pathol. 2011;45:S41-S44.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.S1.S41

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Abstract PDF

We herein describe a case of a 55-year-old healthy woman with localized primary thymic amyloidosis presented as a mediastinal mass, found incidentally by chest radiography. Computed tomography revealed a 4.1 cm soft tissue lesion with nodular calcification in the left anterior mediastinum. The resected specimen was a well-defined lobulating mass with calcification. Microscopically, the mass was consisted of amorphous eosinophilc hyalinized substances involving the thymus and intrathymic lymph nodes. These eosinophilic substances showed apple-green bi-refringence under polarized light after staining with Congo red. In immunohistochemical study, they were positive for kappa and lambda light chains and negative for amyloid A. There was no evidence of systemic amyloidosis in clinical investigations. A final diagnosis of localized primary thymic amyloidosis was made.

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Original Article

Mucoepidermoid Carcinoma of Tracheobronchial Tree: Clinicopathological Study of 31 Cases.: Sang Yun Ha, Joungho Han, Jae Jun Lee, Young Eun Kim, Yoon La Choi, Hong Kwan Kim; Korean J Pathol. 2011;45(2):175-181.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.2.175

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Abstract PDF

BACKGROUND
All aspects of mucoepidermoid carcinoma (MEC) of the lung including histologic grading, clinical behavior and its differentiation from adenosquamous cell carcinoma are still not fully understood.
METHODS
We reviewed the hematoxylin-eosin stained slides and medical records of 31 cases of MEC of the lungs. The cases were classified as low and high grade according to the quantitative grading system formulated for MEC. High grade tumors were tested for an epidermal growth factor receptor (EGFR) mutation.
RESULTS
Twenty eight cases were classified as low grade and 3 cases as high grade. Histologically, lower glandular component, cellular atypia, necrosis, mitoses >4/10 high power fields, and endolymphatic tumor emboli were typical characteristics of a high grade tumor. Although some tumors showed histologic features mimicking high grade tumors, they were classified as low grade tumors according to this quantitative grading system. Low grade tumors showed no recurrence or metastasis. However, among three patients with a high grade tumor, two had distant metastases and one died of disease. Additionally, an EGFR mutation was not detected.
CONCLUSIONS
A high grade MEC was consistently different from a low grade tumor with regard to malignant histologic features and poor prognosis. Therefore, correct histologic grading is important in predicting the prognosis to avoid unnecessary treatment.

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