Spiky/keratosis-pilaris-like early follicular mycosis fungoides: A clinicopathologic study of 20 cases with extended follow-up

Keratosis Pilaris-like Eruption during Treatment of Chronic Myeloid Leukemia with Tyrosine Kinase Inhibitors: Literature Review and Report of a Case Related to Imatinib

The advent of tyrosine kinase inhibitors (TKIs) blocking BCR-ABL activity has revolutionized the therapeutic management of patients with chronic myeloid leukemia (CML). Adverse cutaneous reactions (ACRs) are common nonhematologic adverse events associated with the use of BCR-ABL TKIs. A characteristic pattern of eruption resembling keratosis pilaris (KP) has been described in patients treated with these drugs, especially nilotinib and dasatinib. The pathogenesis of this ACR is still unknown. This type of reaction appears to be uncommon with imatinib. Here, we report the case of an elderly patient with an asymptomatic KP-like eruption, which appeared one month after starting treatment with imatinib for CML. The case presentation is accompanied by a review of similar reactions in patients with CML treated with BCR-ABL inhibitors, attempting to make an excursus on the molecular targets of such drugs and possible mechanisms underlying this ACR.

Keratosis pilaris-artige Mycosis fungoides bei einem Kind

Die Mycosis fungoides (MF) im Kindes- und Jugendalter ist selten und macht 0,5–7% der MF-Fälle aus. Bei Kindern und Jugendlichen sind häufiger MF-Varianten als die klassische MF zu beobachten. Wir berichten über einen 11 Jahre alten Jungen mit einer Keratosis pilaris-artigen MF (KPMF). Die KPMF ist eine seltene Manifestation der follikulotropen MF, die sich mit umschriebenen follikulären Papeln mit spikeartigen Hyperkeratosen darstellt, ggf. begleitet von mildem Juckreiz. Da die Läsionen sehr unscheinbar sein können, wird die Diagnose einer MF oft zunächst nicht in Betracht gezogen, sondern an eine Keratosis pilaris, einen Lichen spinulosus, Lichen planopilaris oder multiple filiforme Hyperkeratosen gedacht. Unter Therapie mit topischen Glukokortikoiden in Kombination mit einer Creme-PUVA-Therapie konnte bei unserem Patienten eine vollständige Remission erreicht werden. In nunmehr 3 Jahren nach Erstdiagnose traten mehrfach Rezidive auf, die jeweils mit hautgerichteter Therapie in komplette Remission gebracht werden konnten.

Facial Spinulate Demodicosis

Hyperkeratotic spicules are rare cutaneous lesions associated with underlying systemic illnesses. In more recent times, facial spinulate demodicosis has been suggested as an etiological factor. Demodicosis is a common dermatological condition characterized by the presence of Demodex mites in the pilocutaneous follicles. This report describes the case of a 40-year-old otherwise healthy woman who reported having undetected facial follicular spicules as a result of demodicosis. The diagnosis was confirmed by physical examination and skin punch biopsy. Initial treatment with 5% permethrin did not resolve the rash. As such, 1% Ivermectin was prescribed, after which the rash resolved completely within 3 weeks.