A case of recurrent pseudolymphomatous folliculitis: A mimic of cutaneous lymphoma

A case of recurrent pseudolymphomatous folliculitis: A mimic of cutaneous lymphoma
J Am Acad Dermatol. 2009 Jun

Kwon EJ, Kristjansson AK, Meyerson HJ, Fedele GM, Tung RC, Sellheyer K, Tuthill RJ, Honda KS, Gilliam AC, McNiff JM.

Department of Dermatology, Case Western Reserve University, Cleveland, Ohio, USA.

Pseudolymphomatous folliculitis is a rare entity. We present a 62-year-old man with a recurrent solitary nodule on his nose requiring multiple excisions. Microscopic examination of the excisions showed a dense lymphocytic infiltrate containing numerous histiocytes and S100+, CD1a+ dendritic cells that surrounded and infiltrated hypertrophic hair follicles. Diffuse sheets of CD3+ T cells and nodular clusters of CD20+ B cells were also seen. There was normal reactive pattern of follicular centers. Light chain restriction was not detected. T-cell receptor and immunoglobulin heavy chain gene rearrangements by polymerase chain reaction revealed negative findings. A diagnosis of pseudolymphomatous folliculitis was made based on the hypertrophic hair follicles, periadnexal S100+ and CD1a+ dendritic cells, and negative clonal gene rearrangement study findings. This case of recurrent pseudolymphomatous folliculitis is instructive because of the resemblance to cutaneous lymphomas and cutaneous lymphoid hyperplasias, and the need for correct diagnosis to avoid overtreatment of this indolent condition.

Elsevier/ScienceDirect

Cutaneous large B-cell lymphoma of the leg: presenting initially as mononeuritis multiplex.

Cutaneous large B-cell lymphoma of the leg: presenting initially as mononeuritis multiplex.
Singapore Med J. 2009 May

Ho SL, Tang BY, Chai J, Tan SH.
National Skin Centre, 1 Mandalay Road, Singapore. sheunling@yahoo.com

We report a rare case of primary B-cell lymphoma of the leg presenting with mononeuropathy multiplex. A 79-year-old Chinese woman who was being investigated for mononeuritis multiplex had an incidental finding of indurated erythematous plaques on the breast and left leg. A skin biopsy from the nodular area on the right breast showed a dense and diffuse infiltrate of atypical cells with large, round, hyperchromatic nuclei with prominent nucleoli. These atypical lymphocytes were CD20+, Bcl-2+ and Mum-1+. A diagnosis of diffuse large B-cell lymphoma, leg type involving the breast and leg with extracutaneous involvement, was made. This case highlights the importance of a full systemic and cutaneous examination in patients presenting with progressive, painful peripheral neuropathy

PubMed