Johnson, E F

Abstract: There is a paucity of data regarding porokeratosis confined to the penis and scrotum. We evaluated our single-institutional experience regarding this entity. We interrogated our pathology archive for all specimens from the penis or scrotum, signed out as porokeratosis between 2000 and 2022. Clinical and histopathological features were reviewed, including the number of cornoid lamella(e) per tissue profile and squamous dysplasia. Nine patients were included in the study. The median age at the time of diagnosis was 51 years. Multiple lesions were present in 3 patients. Six patients had exclusively penile involvement, whereas 2 patients had exclusively scrotal involvement. One patient had multiple lesions consistent with porokeratosis ptychotropica, extending from the scrotum to the buttocks and perineum. Clinically, a collarette of scale was noted in 3 patients and diagnosis of porokeratosis was considered in 1 patient before biopsy. Histopathologically, 2 patients exhibited multiple cornoid lamellae in the same profile and 1 patient had follicular cornoid lamellae. Focal squamous dysplasia was only present in 1 patient. Follow-up was available for 5 patients (median duration: 35 months). In 4 patients, the lesions were removed completely during the shave biopsy procedure. At the past follow-up, there were no signs of recurrence or malignant transformation to squamous cell carcinoma in any patient. Porokeratosis involving the penis and/or scrotum may be elusive to diagnosis based on clinical features alone, emphasizing the role of histopathological examination. Increased awareness of this entity may help better delineate its clinicopathological presentation and appropriate classification.

AbstractBackgroundFollicular mucinosis (FM) is a rare disease characterized by mucin accumulation in the follicular unit. FM's etiology is still widely debated since its first description in 1957. Follicular mucinosis is usually reported to be benign in children, although reports of malignant transformation, most commonly mycosis fungoides, exist. The present project aims to demonstrate that children with a diagnosis of follicular mucinosis have positive long‐term outcomes and do not develop mycosis fungoides.Materials and methodsThis is a retrospective cohort study where patients with a diagnosis of follicular mucinosis ages 22 years and below were identified. Data surrounding the patient's diagnosis of FM, differential diagnosis, treatments, and long‐term outcomes were collected. Patients who were lost to follow‐up were contacted by phone for an update on the status of their skin and overall health.ResultsOut of 14 patients with follow‐up information, none developed subsequent mycosis fungoides or other hematologic malignancies.ConclusionPediatric patients with follicular mucinosis will likely present with limited disease and not experience malignant transformation.

Abstract Background Reactive granulomatous dermatitis (RGD) is an umbrella term used to describe interstitial granulomatous dermatitis (IGD), palisaded neutrophilic and granulomatous dermatitis (PNGD), and interstitial granulomatous drug eruption (IGDR). Objective The aim of this study was to describe systemic associations of RGD, explore possible associations between histopathologic findings and systemic RGD associations and determine clinical relevance of RGD subtypes. Methods We retrospectively studied clinical and histopathologic characteristics of patients with RGD from 1990 through 2020. Results Of 65 patients with RGD (41 women, 24 men; median age at diagnosis, 62 years), 37 had IGD, 26 had PNGD, and 2 had IGDR. Fifty patients (76.9%) had an associated systemic condition; rheumatologic conditions were identified for 34 (52.3%) patients. The associated systemic condition occurred before RGD in approximately 75% of patients. Statistical analyses did not show significant associations between specific subtypes of RGD and systemic diseases or treatment response, and specific histopathologic findings were not predictive of an associated systemic disease. Conclusions Although most patients with RGD had an associated systemic condition, subtypes of RGD did not correlate with systemic associations, lending support to the use of the umbrella term RGD .