A new case of tubulo-interstitial nephritis and uveitis (TINU) syndrome in a 14-y-old girl is described. In this patient unilateral mastitis was an associated feature. The aetiology of this rare syndrome, the prognosis for which is usually good, is still unknown. The most common theory supports a cell-mediated immune response induced by infectious/antigenic stimuli.
Conclusion: The presence of acute unilateral mastitis in this patient may represent an additional localization in TINU syndrome.