月归档:十二月 2010

superficial lacerations 皮肤表面撕裂伤

The abrasions and superficial lacerations shown here are typical for trauma resulting from a vehicular accident involving a motorcycle. The student was wearing a tank top, shorts, and sandals.

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post-transplant lymphoproliferative disorder (PTLD)移植后淋巴组织障碍

The process seen here is representative of post-transplant lymphoproliferative disorder (PTLD), which is caused by Epstein-Barr virus infection that infects B lymphocytes. A proliferation of B lymphocytes is normally controlled by T lymphocytes, but immunosuppressed persons following transplantation have reduced … 继续阅读

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graft versus host disease (GVHD)移植物抗宿主病

Following allogeneic stem cell transplantation, with an incomplete HLA match, donor lymphocytes proliferate and attack host tissues, resulting in graft versus host disease (GVHD). The organs most severely affected with acute GVHD, as in this case, are skin, liver, and … 继续阅读

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small lymphocytic lymphoma (SLL) 小淋巴细胞淋巴瘤(SLL)

This is a small lymphocytic lymphoma (SLL) with typical flow cytometric pattern of positive markers for CD20 and CD5. The latter is a T cell marker that is normally expressed on few B cells. CD19 and CD20 are typicaly B … 继续阅读

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left subclavian artery 左锁骨下动脉闭塞

There is occlusion of the left subclavian artery soon after its origin from the aorta. This would result in loss of peripheral pulses in the left upper extremity. Takayasu arteritis leads to ‘pulseless disease’ because of involvement of the aorta, … 继续阅读

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syringomyelia脊髓空洞症

The spinal cord has a large syrinx. This is syringomyelia, a cavitary expansion of the spinal cord. They are most common in the cervical region, and may extend to the medulla and pons, termed syringobulbia. Most cases are associated with … 继续阅读

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Thromboangiitis obliterans血栓闭塞性脉管炎

Thromboangiitis obliterans (Buerger disease) produces segmental, thrombosing, acute and chronic inflammation of medium-sized and small arteries, most often the tibial and radial arteries of lower and upper extremities. The inflammation may extend to the entire neurovascular bundle, leading to severe … 继续阅读

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Candida albicans 白色念珠菌

This ‘wet mount’ of vaginal fluid shows pseudohyphae of Candida organisms. Candida albicans causes 80-95% of fungal vulvovaginitis cases in the U.S. Other species that may cause this disease include Candida tropicalis, Candida dubliniensis, Candida parapsilosis, Candida guilliermondii, Candida krusei, … 继续阅读

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cardiac myxoma 心脏黏液瘤

This high power microscopic appearance of a cardiac myxoma shows minimal cellularity. Only scattered spindle cells with scant pink cytoplasm are present in a loose myxoid stroma. The most common primary cardiac neoplasm is an atrial myxoma. These benign masses … 继续阅读

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malignant melanoma 恶性黑色素瘤

The nodule in the cerebellar hemisphere represents a metastasis. The black colour suggests malignant melanoma. Lung, breast, melanoma, genitourinary tract (mainly kidney), and gastrointestinal tract are the most frequent primary tumors that metastasize to brain. Metastases to the cerebrum are … 继续阅读

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