A case of sebaceous carcinoma arising within a benign ovarian cystic teratoma.

Background: Mature cystic teratoma, also known as dermoid cyst, is the most common germ cell tumor of the ovary. Malignant change in a component of a mature ovarian teratoma is rare, occurring in less than 2% of cases, with squamous cell carcinoma corresponding to 80% of such neoplasms. Pure sebaceous carcinoma is exceedingly rare, with only 6 reported cases thus far.

Skin relapse of acute myeloid leukemia associated with trisomy 8.

Acute myeloid leukemia (AML) is a morphologically diverse group of hematopoietic malignancies characterized by proliferation of immature cells that arise in the myeloid progenitor cells of the bone marrow. It shows cutaneous lesions relatively rarely. The most common cutaneous manifestation is the appearance of one or several tumors.

Primary langerhans cell histiocytosis of the vulva.

Langerhans cell histiocytosis (LCH) of the female genital tract is very rare. A review of the literature revealed that only 12 cases of primary vulvar LCH have previously been published. We describe an additional case of LCH in which the disease was confined to the vulva.

Primary non-Hodgkin's lymphoma arising in an intramammary lymph node.

Non-Hodgkin's lymphoma (NHL) of the breast may be primary or secondary. Both are rare and there are no morphological criteria to make the differential diagnosis. Benign intramammary lymph nodes are often encountered, but the development of either primary or secondary lymphoma within an intramammary lymph node is extremely rare.

Primary anaplastic large cell lymphoma of the kidney.

Primary renal lymphoma is a rare disease. There is still no agreement on its development primarily in this non-lymphoid organ. Some of the reported cases are questionable because of the incomplete staging of extrarenal disease.