Cortical desmoid (also called tug lesion or periosteal desmoid) is an irregularity of the distal femoral cortex caused by repetitive stress at the attachment of the adductor magnus aponeurosis. It is most commonly seen in adolescents and is usually asymptomatic. It is a benign and self-limiting lesion. References
Gould CF, Ly JQ, Lattin GE, Beall DP, Sutcliffe JB (2007). "Bone tumor mimics: avoiding misdiagnosis". Curr Probl Diagn Radiol. 36 (3): 124–41. doi:10.1067/j.cpradiol.2007.01.001. PMID 17484955.
Permanent junctional reciprocating tachycardia (PJRT) is a rare cardiac arrhythmia. It is a supraventricular tachycardia, and a cause of atrioventricular reentrant tachycardia (AVRT). PJRT can cause chronic tachycardia that, untreated, leads to cardiomyopathy. The cause is an accessory pathway in the heart which conducts from the ventricles back to the atria. Unlike the accessory pathway in a more common cause of AVRT, Wolff–Parkinson–White syndrome, the accessory pathway in PJRT conducts slowly. This means that the associated tachycardia may be subclinical and only diagnosed at a late stage, after significant damage to the heart has been caused from prolonged and recurrent episodes of AVRT. Symptoms
Palpitations during exercise or stress may be the presenting symptom. Because the initial symptoms are often mild, there may be significant myocardial damage at the time of diagnosis. It is therefore possible for these patients to present with the symptoms of heart failure, such as shortness of breath, fatigue and  oedema (fluid retention). Cause
In-between episodes there is normal electrical conduction in the heart. During an episode of AVRT caused by PJRT, the accessory pathway conducts electrical activity from the ventricles directly back to the atria at the end of systole, which triggers the atria to contract, and the current to pass back to the ventricles again via the atrioventricular node (AV node); see diagram. Diagnosis
There may be no signs outside of an episode.