Purpose or Case Report: Talar callosity, also known as foot pressure pad, is relatively rare in children. It is characterized by the development of a localized thickening of the skin and subcutaneous tissues on the dorsolateral aspect of the hindfoot to midfoot, most commonly at the level of the talus, navicular, or cuboid bones, and is attributed to repetitive pressure of the soft tissues against the bone. Such mechanical stress typically occurs in children who frequently maintain flexed leg positions with direct pressure on the dorsolateral foot, often in the absence of footwear.
The clinical course of talar callosity is benign, tending to remain stable over time as long as the underlying positioning persists. Clinically, talar callosity can be uni or bilateral and may present as focal skin hyperpigmentation and hyperkeratosis, which is often more obvious during foot adduction and plantar flexion. The true prevalence of this condition is likely underestimated, as it is typically asymptomatic and does not cause pain or functional impairment. The most frequent reason for medical consultation is the parental concern generated by the appearance of a painless nodule on the dorsum of the foot.
Although clinical diagnosis is usually straightforward, imaging studies may be requested when the lesion is mistaken for other entities, such as ganglion, vascular malformations, or soft tissue tumors. In such scenarios, ultrasound is the preferred initial imaging modality.
This exhibit illustrates five ultrasound-documented cases of talar callosities in children aged 4-10 years, two of which also had investigation with MRI. In each case, the ultrasound showed a partially defined, heterogeneous, hypoechoic thickening of the subcutaneous tissue, typically with an ellipsoid morphology, measuring between 1.3 cm and 1.8 cm in the maximal dimension, with absence of significant vascularity, and no involvement of tendinous or deep osseous structures, in keeping with the previously reported cases in the literature. MRI showed the lesions but did not add any further information to aid in the final diagnosis.
Recognition of this benign entity by clinicians and radiologists is crucial, as it can prevent unnecessary diagnostic procedures and invasive interventions, such as biopsy. The primary objective of this exhibit is to increase awareness of talar callosity among radiologists, thereby promoting accurate diagnosis and reducing the frequency of unwarranted investigations and decreasing parental concern.
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