The lymphocytes were small and, other than the monomorphous
appearance, were cytologically unremarkable.
It was described as monomorphous
piloid cells loosely arranged, displayed in a uniform and extensive myxoid background.
Usually caused by chronic incontinence (especially diarrhea), pseudowarts are bilaterally symmetrical, monomorphous
, well-demarcated, flat-topped papules.
Pathologic examination of the biopsy specimens revealed a diffuse monomorphous
population of small and medium-size lymphocytes with round to oval nuclei, prominent basophilic nucleoli, coarse chromatin, and a thick nuclear membrane; abundant mitotic figures and tingible-body macrophages were easily identified, giving rise to the classic "starry-sky" appearance (figure 3).
Clinical features include monomorphous
, edematous, red papules 1-10 mm in size that appear on the cheeks, extremities, and buttocks.
Clonality may be suggested on the basis of traditional morphology if a monomorphous
cell population is present, immunopathologically by showing the presence of monoclonal surface immunoglobulin (in the case of B-cell neoplasms), cytogenetically by demonstrating a recurrent chromosomal alteration such as recurrent translocation, and by molecular genetics by demonstrating the presence of a clonal B- or T-cell gene rearrangement.
Mantle cell lymphoma is characterized by a monomorphous
population of small to medium-sized lymphocytes with irregular nuclei.
(1) The term "eruptive vellus hair cysts" was first used to describe a longstanding hyperpigmented, monomorphous
papular eruption in two children by Esterly, Fretzin, and Pinkus in 1977.
Intrarenal solitary fibrous tumor of the kidney report of a case with emphasis on the differential diagnosis in the wide spectrum of monomorphous
spindle cell tumors of the kidney.
Moreover, MM arising from acquired or congenital nevi are predominantly composed of roundish, monomorphous
cells, whereas melanomas arising either de novo or from dysplastic nevi were characterized by markedly pleomorphic cells (16).
* Eruptive xanthoma affects patients with hypertriglyceridemia with a sudden onset of monomorphous
erythematous to yellowish papules over the buttocks, shoulders, and ex tensor surfaces of the extremities.
As seen in this case, some patients with molluscum (5%) develop a diffuse, monomorphous
, papular, or papulovesicular eruption that is an id reaction.