J Korean Foot Ankle Soc.  2021 Jun;25(2):108-110. 10.14193/jkfas.2021.25.2.108.

Symptomatic Os Paracuneiforme: A Case Report

• Woo SH
• Shin WC

• KMID: 2516649
• DOI: http://doi.org/10.14193/jkfas.2021.25.2.108

Abstract

An extremely rare accessory bone of the foot located in the distal portion of the navicular that articulates with the medial cuneiform was observed. Os paracuneiforme is usually located medial to the medial cuneiform or the naviculocuneiform joint. Although os paracuneiforme is often referred to as an accessory bone around the foot, few cases of this type of accessory bone have been reported. This paper reports a patient with a painful Os paracuneiform who underwent surgical excision of the accessory bone.

Keyword

Os paracuneiforme; Accessory bone; Foot

Figure

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  Figure. 1 Radiographs of the affected left foot revealing the wedge shaped accessory bone (arrows) between the navicular and medial cuneiform. (A) External oblique view, (B) enlarged marked portion of external oblique view.

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  Figure. 2 Sagittal view of computed tomography showing that the accessory bone was positioned between the navicular and medial cuneiform (arrow).

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  Figure. 3 Sagittal view of contrast-enhanced T1-weighted magnetic resonance images of the accessory bone. White arrow shows focal nodular enhancing lesion noted at inferior medial naviculocuneiform joint. About 5 mm sized accessary bone with adjacent joint osteophytes.

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  Figure. 4 Gross photo of specimen of the accessory bone: wedge shape mass about 4.0 mm×8.0 mm size.

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  Figure. 5 Microscopic finding of the os paracuneiforme, which shows small aggregates of chondrocytes surrounded by the hyaline matrix (H&E stain, ×100).

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