ABSTRACT
BACKGROUND: Primary pulmonary sarcoma is extremely rare and mostly metastatic, and primary pulmonary myxoid sarcoma PPMS is a rare low-grade malignant sarcoma. The clinical manifestations of PPMS patients are relatively non-specific, sometimes found by physical examination. We report a case designed to explore the clinicopathologic features, diagnosis, and differential diagnosis of primary pulmonary myxoid sarcoma (PPMS). A 44-year-old man was found to have a primary myxoid sarcoma in the upper right lung on physical examination. The patient did not have any symptoms of discomfort. Histologically, the tumors had well-defined borders, and with grayish-white or grayish red cut surfaces. Under the microscope, the tumor cells were composed of oval and spindle cells arranged in a network or strips in a mucus-like stroma. Immunohistochemically, neoplastic cells showed diffuse and strong vimentin expression and focal weak EMA, and Bcl-6 staining. The expression of AE1/AE3, ALK, CD34, CD68, SMA, and CD99 were all negative. The Ki-67 index was low. CONCLUSION: PPMS is a rare low-grade malignant primary pulmonary sarcoma without characteristic clinical symptoms and difficult to diagnose. It is mainly diagnosed by immunohistochemistry and genetic testing.
ABSTRACT
Alveolar soft part sarcoma (ASPS) is a soft tissue malignant tumor of unknown origin in which tissues or cells are arranged like acini or organs. It usually presents in the deep muscles or fascia of the extremities, and rarely occurs in the head and neck, let alone the tongue. To our knowledge, only 49 cases of ASPS have been previously published in the tongue. Therefore, the course, age of onset, tumor size, and prognosis of ASPS in the tongue are not well understood. We present a case of ASPS in the dorsum of left tongue of a 24-year-old female. Histology of the resected tumor showed features of ASPS. She is currently disease-free at 12-month follow-up.
ABSTRACT
Micronodular thymoma with lymphoid stroma (MNT) is a rare subtype of organoid thymic epithelial tumor that occurs in middle-aged and elderly people. Histologically, MNT is characterized by multiple epithelial nodules that are scattered or fused and abundant lymphocyte stroma with prominent germinal centers. It has a benign course and a good prognosis, and its diagnosis mainly depends on histopathologic and immunohistochemical markers. This article reports two cases of MNT to explore its clinicopathologic features, diagnosis and differential diagnosis to improve understanding of this subtype. In addition, we review previously reported cases of MNT.