Moreover, FNAB has shown a significant number of false positives and negatives [22] and MRI is considered inconclusive [23]: in the Lim series [20], out of 5 cases considered, only 60% were diagnosed correctly. Therefore, it is necessary Dinaciclib to identify a diagnostic imaging technology to assure

a correct diagnostic hypothesis. High-frequency ultrasound [24] is a very simple, reliable imaging technique, yet poorly reported in literature and in numerically limited series [19]. Hughes et al. [25] presented a cohort of 28 clinically suspected PM cases, diagnosed employing a relatively low frequency probe (7 MHz). 20 patients underwent surgery and were evaluated histologically: 16 were confirmed as PM, 2 were epidermoid cysts and, in 2, it was not possible to asses any diagnosis. Similar data have been

reported by Ulrich et al. [26], Lim el al. [20], Hwang el al. [27] and Whittle el al. [28]; Buchwald et al. [29] diagnosed one case of PM using ultrasound microscopy. In the Whittle series [28], typical PM sonographic features were characterized by a hypoechoic small superficial nodule (find more between epidermis and dermis), with not always well-defined margins, with some calcified areas (98% of this series) of variable appearance, formed of central Talazoparib mouse or peripheral single or grouped foci of variable shapes [24]. The lesion was sometimes surrounded by a hypoechoic halo and sometimes perilesional Doppler flow signals were present. So far, two different PM sonographic patterns have been described in literature: the totally calcified nodule and the hypoechoic nodule with internal calcified foci. Conducting a retrospective study of our cases, the paper aims to identify high-frequency

ultrasound patterns of PM that should improve clinical diagnosis. Methods Images of 124 patients with a histological diagnosis of PM were retrieved from the 1996-2008 archive of the Dermatopathology Unit of our Institute. Pre-operatory O-methylated flavonoid ultrasound images of 28/124 patients were available. In order to avoid the comparison of two inhomogeneous groups, we only analyzed data of these 28 patients (with 32 lesions and 5 different locations on one patient), whose clinical records were complete. Fourteen females and 14 males, aged between 12 and 58 years, were considered in the study. Three different Esaote ultrasound units (Genoa, Italy) were sequentially used during the period 1996-2008: respectively, AU4 apparatus with 20-MHz Anular Array, single crystal probe, an AU5 apparatus, with the same probe, and, lastly, a My Lab 70, with linear probe having a maximum rated frequency of 18 MHz, completed of colour, power and pulsed Doppler.