An unusual case of B-cell lymphoma of the scalp.

B-cell lymphoma is a lymphoproliferative non-Hodgkin lymphoma arising from B cells, a type of immune lymphocytes that produces antibodies in the follicles of lymph nodes. Primary cutaneous B-cell lymphoma (PCBCL), a subtype of B cell lymphoma, originates within cutaneous tissue without evidence of extracutaneous involvement. There are very few reports of PCBCLs originating in the scalp. The most common tumors of the scalp are usually benign with only 1%-2% being malignant, most being basal cell carcinoma, squamous cell carcinoma, or melanoma. Primary cutaneous follicular cell lymphoma (PCFCL) is regarded as the most common lymphoma of the skin with an indolent course and favorable prognosis due to the response rate to treatment methods such as surgical removal with local radiotherapy, topical drugs, and intralesional therapies. This report highlights a rare case of PCFCL originating in the scalp, to raise awareness of a topic that requires continued established management.

Recurrence of digital papillary invasive adenocarcinoma.

Adenocarcinoma is extremely uncommon in the digits with an incidence of 0.08 per 1 000 000 people per year, known as digital papillary adenocarcinoma (DPA). This disease is commonly described pathologically as malignancy of the sweat glands. The fundamental histologic characteristics of DPA are the presence of papillary projections in cystic spaces in a multinodular tumor lined by epithelial cells. DPA are often delayed in diagnosis because of either misdiagnosis for benign lesions or underreporting, which can contribute to poor prognosis and metastasis. This report serves to present a case of recurrence observed in primary digital adenocarcinoma and to bring awareness to the topic as concrete management continues to develop.

Sarcomatoid mesothelioma: unusual findings and literature review.

Sarcomatoid mesothelioma is an aggressive disease secondary to its propensity to undergo rapid growth, show inconsistent expression of tumor markers and invade surrounding tissues. Therefore, there are numerous obstacles that clinical researchers face as they look for new methods to diagnose and treat the malignancy. We present a case of sarcomatoid mesothelioma, originally thought to be metastasis from renal cell carcinoma.