The claim was reportedly contained in court papers obtained by a celebrity website following Ms Stone's unsuccessful custody battle with her former husband Phil Bronstein.
The document portrayed the 50-year-old star of the Basic Instinct films as an alarmist parent who had become convinced that Roan, whom the couple adopted, suffered from a spinal condition despite there being "no evidence" to back up her belief.
Judge Anne-Christine Massullo of San Francisco Superior Court also reportedly suggested that Ms Stone's acting commitments meant that she was often an absent parent who passed on many of her responsibilities to third parties because of her busy schedule and frequent travels.
The document, known as a Tentative Statement of Decision, set out the judge's decision to deny Ms Stone's request to have custody arrangements modified to allow her to bring the child, who lives with Mr Bronstein in San Francisco, to her home in Los Angeles.
Ms Stone separated from Mr Bronstein, a newspaper editor, five years ago and the couple later divorced quietly.
In one highly critical passage the judge questions Ms Stone's commitment to the boy remarking: "If Mother has, in fact, limited her career to make herself available for Roan, she has done little to make this evident to Roan, his school or this court."
Ms Stone's attorney was not available for comment last night.
Describing the actress's relationship with the boy, the document, which was obtained by the website TMZ.com, allege: "Mother appears to overreact to many medical issues involving Roan."
Despite his young age, Ms Stone's alleged over-reactions were "painfully real" to the boy, the judge remarked.
She went on: "Another example of an overreaction is that Mother suggested that Roan should have Botox injections in his feet to resolve a problem he had with foot odour.
"As Father appropriately noted, the simple and common sense approach of making sure Roan wore socks with his shoes and used foot deodorant corrected the odour problem without the need for any invasive procedure on this young child."
It adds: "Father has championed for Roan's well-being out of, what appears to this court, nothing less than the unconditional love for his son.
"Unfortunately, and for unexplained reasons, it appears that Mother did not involve herself to the extent she could or should have in this process ... Mother has attempted to put up roadblocks to Roan's getting help, or has decided against participating in his care."
Mr Bronstein, the former editor-in-chief of the San Francisco Chronicle, was once known by the nickname "El Macho".
Before marrying the Hollywood star he was best known as the reporter who first documented the former Philippine First Lady Imelda Marcos's vast collection of shoes after the collapse of her husband President Ferdinand Marcos's regime in 1986.
During the couple's marriage Ms Stone once arranged for him to visit a rare 7ft komodo dragon at the Los Angeles zoo as a Father's Day surprise.
But the treat ended in disaster with Mr Bronstein being rushed to hospital after being bitten in the foot by the reptile.Original here