Kaposi's sarcoma in acquired immune deficiency syndrome (AIDS).

Of 22 patients with Kaposi's sarcoma, 16 had the acquired immune deficiency syndrome (AIDS). The histological pattern in AIDS differs from the more familiar classical Kaposi's sarcoma. The features most useful in making the diagnosis are: dissection of collagen; lymphatic vessel like spaces; angiomatoid lesions; premonitory sign; and spindle cell proliferation. It is important to examine multiple levels of small biopsy specimens and to be cautious in making the diagnosis of patch Kaposi's sarcoma in the presence of recent or healed ulceration and at sites of previous trauma. Only four of 16 patients with AIDS had evidence of systemic Kaposi's sarcoma, supporting the view that Kaposi's sarcoma in AIDS does not necessarily have an aggressive clinical course.