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is a significant concern for physicians. Central0 F0 y3 L6 Z+ ?% {
precocious puberty (CPP), which is mediated
5 i) o" U! p4 T* y' U9 {6 r! qthrough the hypothalamic pituitary gonadal axis, has# N% `) v) y$ P: @( f8 w7 w8 V
a higher incidence of organic central nervous system- x% L8 _+ d4 Z: k$ S
lesions in boys.1,2 Virilization in boys, as manifested
: w; O+ Z% v; p( ` `3 r b$ j( uby enlargement of the penis, development of pubic" j, n6 H* Q: ^& L' E2 p
hair, and facial acne without enlargement of testi-
5 W3 l8 p! ?- M1 s1 [- e+ t3 T/ icles, suggests peripheral or pseudopuberty.1-3 We- y+ ~# }) {$ q! `
report a 16-month-old boy who presented with the& _6 Y( a* S7 r) T. o+ X# M- g
enlargement of the phallus and pubic hair develop-
! S+ y2 o) K" A/ `1 q! dment without testicular enlargement, which was due6 E* E; X) P/ J# q
to the unintentional exposure to androgen gel used by
0 A, \0 H+ d- G& ethe father. The family initially concealed this infor-' A# d- r" S+ F6 k3 H" n
mation, resulting in an extensive work-up for this% E3 {* A" r4 I3 a; T" i
child. Given the widespread and easy availability of% ?) Q) A1 ?% _2 v7 Y
testosterone gel and cream, we believe this is proba-
! y4 f; E1 X/ ~- @0 K ybly more common than the rare case report in the
3 s( P: @" v9 f4 [, Eliterature.4
9 O2 D) y3 M+ ?4 N* UPatient Report
' l) M- O b- m, ^, F- DA 16-month-old white child was referred to the
* N, k& M! O) Nendocrine clinic by his pediatrician with the concern
, G, e; P# n% z( E+ F0 Sof early sexual development. His mother noticed
& L6 o+ y1 l5 ~( a0 ]light colored pubic hair development when he was) q1 ]; ]$ Y m t3 n7 N3 j7 O
From the 1Division of Pediatric Endocrinology, 2University of, f2 t* G4 H- D( M
South Alabama Medical Center, Mobile, Alabama.
. }" R5 t; u" C/ R% GAddress correspondence to: Samar K. Bhowmick, MD, FACE,7 E$ o2 a) y R" L! ^4 L
Professor of Pediatrics, University of South Alabama, College of
* ~; f& s! ` S w0 NMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
+ O: z I( p, H( |e-mail: [email protected].. `$ a, M) |) `0 p8 }- `. H9 Z
about 6 to 7 months old, which progressively became9 ]( E/ S' f) Y N
darker. She was also concerned about the enlarge-
* u* r; ?( u6 x6 d9 r8 Z Kment of his penis and frequent erections. The child
" S3 w+ E; ]0 M5 A8 ]was the product of a full-term normal delivery, with
5 r* p, G) b7 c9 y" |, S! _a birth weight of 7 lb 14 oz, and birth length of0 g e: x. T% P0 P; ^% c
20 inches. He was breast-fed throughout the first year, \- c/ ?6 Q' ~' p: Q3 ~; y
of life and was still receiving breast milk along with
! m9 r/ o7 ]5 c& t4 {/ q# zsolid food. He had no hospitalizations or surgery,4 v" v" t) ~3 f s; z' Y4 D% k- A
and his psychosocial and psychomotor development- s2 R# J7 `) {. B* |; J
was age appropriate.6 Y& j% c& v+ [/ v7 C4 c
The family history was remarkable for the father,
$ Y& i' u% |0 J1 X: {. Vwho was diagnosed with hypothyroidism at age 16,# l+ u+ P7 o4 y: J; B, w. D1 a
which was treated with thyroxine. The father’s: n9 D( d- j/ f* i- T4 k
height was 6 feet, and he went through a somewhat/ [1 E& R$ H7 x
early puberty and had stopped growing by age 14.
* W, `1 i2 e. h" p+ ? EThe father denied taking any other medication. The
# G) ~. ^% J/ `3 A7 [" c+ h8 f- T. uchild’s mother was in good health. Her menarche6 w ?1 I5 ~2 M
was at 11 years of age, and her height was at 5 feet- t& V/ C" g7 a0 M
5 inches. There was no other family history of pre-
1 E5 J* p7 Q( D2 q5 F8 ]- Jcocious sexual development in the first-degree rela-
8 c m* Y2 y P* D* Jtives. There were no siblings.
) g5 o. }- B1 B, |Physical Examination4 }2 w( o5 w$ v- C5 e. j
The physical examination revealed a very active,2 i5 r% C5 m3 ?( C1 ~* m
playful, and healthy boy. The vital signs documented5 s- _' t1 G* a- o- J/ V; l
a blood pressure of 85/50 mm Hg, his length was
; ?, z: J' b/ q6 k$ F# |+ H, r90 cm (>97th percentile), and his weight was 14.4 kg6 b F G" q! Z
(also >97th percentile). The observed yearly growth
- I* L8 a% E9 a; Tvelocity was 30 cm (12 inches). The examination of$ c5 e1 S) s2 O! \9 |4 i
the neck revealed no thyroid enlargement.
) n/ o9 y" x9 V, v- E6 u# hThe genitourinary examination was remarkable for8 A6 P2 X% P* v; W$ L# {! q
enlargement of the penis, with a stretched length of* ?' p! @0 i2 P
8 cm and a width of 2 cm. The glans penis was very well
4 ]$ {+ r, P: N9 j1 m8 _) Cdeveloped. The pubic hair was Tanner II, mostly around
4 F# C+ M8 |; Q. d2 u540
+ u |* R8 S. ]9 W6 Cat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 ]; n& ~/ J2 a! Z/ H2 ?7 r' W2 ?
the base of the phallus and was dark and curled. The
) l4 h8 j. |1 g0 h' Utesticular volume was prepubertal at 2 mL each.. Z) [* }/ R% q1 }
The skin was moist and smooth and somewhat
8 N- g f! L! l" o. O7 j8 uoily. No axillary hair was noted. There were no
9 L$ H d" Z& U" _abnormal skin pigmentations or café-au-lait spots./ V4 l* U$ w( Y) Q; j
Neurologic evaluation showed deep tendon reflex 2+) x% h5 d5 l) b% F: v" b
bilateral and symmetrical. There was no suggestion
' X/ [$ w; e0 @7 uof papilledema.
8 S# g$ [+ [0 z% `( m; t d7 n" _Laboratory Evaluation
# f* o- ]; i" r, ^' F( G7 PThe bone age was consistent with 28 months by) t& q4 {+ K7 Z3 d& h
using the standard of Greulich and Pyle at a chrono-; V/ m9 d! i- V1 I
logic age of 16 months (advanced).5 Chromosomal4 W- E# |4 A9 |5 g8 o: L7 i, @
karyotype was 46XY. The thyroid function test1 b. t% ~$ _0 H3 `4 E( E0 y$ F, S
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
* l+ O" {' U0 [) z$ `- ilating hormone level was 1.3 µIU/mL (both normal).
- n" h' V( K; U* QThe concentrations of serum electrolytes, blood* F% J( b$ ?4 O
urea nitrogen, creatinine, and calcium all were/ p! p9 \! y b$ @' k' Y
within normal range for his age. The concentration% M. I/ D( o+ N3 E; }# _
of serum 17-hydroxyprogesterone was 16 ng/dL; l" M: z9 ]$ _4 ^* C# D1 {
(normal, 3 to 90 ng/dL), androstenedione was 20
# C' B$ X$ m5 E' V! Ong/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
0 D4 ]! I6 M6 h4 G, z* M- Wterone was 38 ng/dL (normal, 50 to 760 ng/dL),
5 Y- v; ]* Z/ ]; n5 xdesoxycorticosterone was 4.3 ng/dL (normal, 7 to% U9 ]' S# g; I9 P1 x3 c7 J
49ng/dL), 11-desoxycortisol (specific compound S)
- I& e5 b$ t4 e' Y8 j2 E, c) jwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-% v3 F. n) C7 n4 }2 t
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
5 d' P7 R" {/ ]: ytestosterone was 60 ng/dL (normal <3 to 10 ng/dL),$ J2 V1 ^- G! d
and β-human chorionic gonadotropin was less than
5 Y7 v; x/ ?; ]9 G% |5 mIU/mL (normal <5 mIU/mL). Serum follicular! X: T% D9 G7 R0 j7 f, X* l3 t
stimulating hormone and leuteinizing hormone3 w o5 j4 w- F% j3 J& n$ n- B" E
concentrations were less than 0.05 mIU/mL
1 G C# i+ @0 v j- X2 b7 z3 U(prepubertal).
$ P! l8 I+ r2 \" mThe parents were notified about the laboratory$ P3 Q: |9 d, i
results and were informed that all of the tests were
6 A2 R, {- h: E% w# ^% Z8 |normal except the testosterone level was high. The
1 ]8 S# N9 L \3 ofollow-up visit was arranged within a few weeks to
1 G) p, B& K* w- p, a! yobtain testicular and abdominal sonograms; how-
, v& x: ^9 ?$ y6 t% Bever, the family did not return for 4 months., M4 j* a8 J1 c* W! {* t/ F5 }2 q5 v
Physical examination at this time revealed that the
$ O4 e, k6 ^/ R4 Z, g1 Qchild had grown 2.5 cm in 4 months and had gained
7 F' K% W+ i+ C. o$ O N2 kg of weight. Physical examination remained( Y) E3 y# _; v& B
unchanged. Surprisingly, the pubic hair almost com-( v; U3 p3 t6 f# _
pletely disappeared except for a few vellous hairs at
8 f' n. t9 u& ~6 c; `# Sthe base of the phallus. Testicular volume was still 2
* w4 i, Z8 C: D3 V AmL, and the size of the penis remained unchanged.
/ l6 V5 s, {% e) z4 V3 F! i+ lThe mother also said that the boy was no longer hav-! a' |$ T3 G! P3 y% v6 _: d) U3 H0 [
ing frequent erections." _5 g7 e' D' K
Both parents were again questioned about use of( W( I, O. i6 T; }! V; H& f! B
any ointment/creams that they may have applied to
% I) h( ^( q, p9 t: d/ z. ^3 Tthe child’s skin. This time the father admitted the- S( s2 G, @! u3 i+ z, h4 |2 [
Topical Testosterone Exposure / Bhowmick et al 541
1 |0 y/ d2 c6 c; Duse of testosterone gel twice daily that he was apply-
x( m! d, I" Oing over his own shoulders, chest, and back area for
$ `' p' H! Q2 v9 aa year. The father also revealed he was embarrassed
+ f3 i8 m- u2 C) wto disclose that he was using a testosterone gel pre-
! F2 P- H, n/ j/ u7 C9 Iscribed by his family physician for decreased libido8 P/ f. W* g3 Z, k# |/ J$ q6 `# g0 r
secondary to depression.0 e* i5 ?8 m+ @
The child slept in the same bed with parents.
/ p+ P) U7 J( D f( w1 KThe father would hug the baby and hold him on his
, \% d; \9 t' |! uchest for a considerable period of time, causing sig-! A5 v) Z! k: G7 f5 d( U5 G+ ^
nificant bare skin contact between baby and father.
5 G! t1 T. o+ ]% MThe father also admitted that after the phone call,( ^. E6 ]7 I5 J5 |/ d
when he learned the testosterone level in the baby
6 L2 _; B2 t: b9 a* K' ^ e$ f- \was high, he then read the product information
) m- h; k! d0 Z9 s6 Ipacket and concluded that it was most likely the rea-
& [9 O, x; o/ i& g4 ?0 K: [; qson for the child’s virilization. At that time, they
) W( D, j9 u2 `7 `: z& N' ?decided to put the baby in a separate bed, and the
& W+ {9 n2 W- n! Tfather was not hugging him with bare skin and had( ~" h/ h" y. Z9 I3 X7 V7 }3 d
been using protective clothing. A repeat testosterone
/ Z# x/ \, i: ktest was ordered, but the family did not go to the6 ?2 Y9 t# |. x
laboratory to obtain the test.
& ^; N P, B, Q9 XDiscussion
: i- g' w5 E2 e- j# \* @Precocious puberty in boys is defined as secondary/ q3 m8 i& q0 o) e) D% y, \
sexual development before 9 years of age.1,4
* j( E6 U, m3 X2 N ?3 E R- J% OPrecocious puberty is termed as central (true) when
+ a& [2 f+ F% J$ Iit is caused by the premature activation of hypo-5 o u5 p" j+ K3 t" T/ r7 V
thalamic pituitary gonadal axis. CPP is more com-6 _6 U9 j. r( E+ x
mon in girls than in boys.1,3 Most boys with CPP% w; b. \8 ?( @" d/ a) ]6 P
may have a central nervous system lesion that is$ s9 `) U8 v5 L% V7 y% }8 o! V
responsible for the early activation of the hypothal-6 Q. {& d3 @. V! C
amic pituitary gonadal axis.1-3 Thus, greater empha-0 ~, Y6 I# r- ?/ w d
sis has been given to neuroradiologic imaging in5 q, i! u( u9 }# c+ O. C! |
boys with precocious puberty. In addition to viril-: d/ ?* ?& q1 o# V' X* Q: I1 s# I& ~. X+ g
ization, the clinical hallmark of CPP is the symmet-$ L5 {+ p6 j8 C# [0 `' n
rical testicular growth secondary to stimulation by# y0 z) T+ @8 u7 ?! B
gonadotropins.1,3
4 g. f/ I7 E4 c! q1 zGonadotropin-independent peripheral preco-
; @, W7 D; R4 r* }8 [# [* Acious puberty in boys also results from inappropriate
& k+ }! G% m" j* I1 Oandrogenic stimulation from either endogenous or+ b& P' [2 T( v% `
exogenous sources, nonpituitary gonadotropin stim-: ^# K2 T0 e# f P! ~
ulation, and rare activating mutations.3 Virilizing
* H6 \0 B4 j, zcongenital adrenal hyperplasia producing excessive" h- X+ J' r+ a% J2 z
adrenal androgens is a common cause of precocious. g8 F/ O n, H! w3 J' M
puberty in boys.3,4
, j: f/ {( j, D, U# P! ~The most common form of congenital adrenal" E" t' x! T- g! h( e
hyperplasia is the 21-hydroxylase enzyme deficiency.9 U% t' D0 p# p- ~7 g# a
The 11-β hydroxylase deficiency may also result in" b6 _; @' T2 _$ x5 \1 a0 i
excessive adrenal androgen production, and rarely,
" ~% J- T: X# Q( T; Aan adrenal tumor may also cause adrenal androgen
) a: u' y9 n+ r' R4 j& z0 V/ aexcess.1,3/ i5 g5 z' J4 K
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from: G4 [) a% p. |' L7 r
542 Clinical Pediatrics / Vol. 46, No. 6, July 20072 Z' z( z$ l) I5 ]/ n6 ?, V
A unique entity of male-limited gonadotropin-
5 P, Y, O' L! k. n! Lindependent precocious puberty, which is also known& J. _: v9 P9 ^0 F/ p% y6 D
as testotoxicosis, may cause precocious puberty at a. ?, s" O3 C y+ m
very young age. The physical findings in these boys
0 s1 E6 ^7 T- j( J w8 ]0 pwith this disorder are full pubertal development,4 r: b: N: B, l" g+ B6 V1 s9 a
including bilateral testicular growth, similar to boys
2 S5 z; V5 d! u" {; |+ pwith CPP. The gonadotropin levels in this disorder
- a( f' K. |0 `, C3 @* ware suppressed to prepubertal levels and do not show# d1 q. p: ^; t9 p5 n/ m
pubertal response of gonadotropin after gonadotropin-" s, N% d4 R7 b3 m y
releasing hormone stimulation. This is a sex-linked6 X, V u# h) N! I" L, z" T, X
autosomal dominant disorder that affects only3 p: }9 x9 X4 i3 @
males; therefore, other male members of the family% @+ f5 U. `' p+ M* q
may have similar precocious puberty.31 q- q# ?0 ]' H S1 I" X. a: r' ?
In our patient, physical examination was incon-( J- k7 _5 h& {/ x. _1 X
sistent with true precocious puberty since his testi-% r3 R, w- s1 q) m+ v, [
cles were prepubertal in size. However, testotoxicosis! C# x* a4 B1 q+ }
was in the differential diagnosis because his father
" W( Z4 Q. H+ A' q* a, }1 Xstarted puberty somewhat early, and occasionally,
8 |7 ]( Y1 S! U8 ^' btesticular enlargement is not that evident in the+ D' y+ L4 \# M* j/ {
beginning of this process.1 In the absence of a neg-
/ [3 w U9 S* X' P) K* `" Z$ L eative initial history of androgen exposure, our
& O" r$ ?' K8 R. y! Vbiggest concern was virilizing adrenal hyperplasia,1 M$ x W+ j3 s, U9 `7 }+ ]4 ^& e
either 21-hydroxylase deficiency or 11-β hydroxylase, U9 d* X& ]# C. P
deficiency. Those diagnoses were excluded by find-
, U7 A0 W$ r; ]ing the normal level of adrenal steroids.
+ S5 b" [7 ?( ?9 ~9 h2 P8 ]The diagnosis of exogenous androgens was strongly K( T8 F+ L) T: T6 M' {0 k
suspected in a follow-up visit after 4 months because
7 Y, Y+ a+ J* s" \' i1 a, T" Dthe physical examination revealed the complete disap-
" O8 n: t2 `! M* z+ Z- Cpearance of pubic hair, normal growth velocity, and( _$ x8 o! P: ^9 C% j+ [3 \
decreased erections. The father admitted using a testos-/ ?2 y( S9 V. |
terone gel, which he concealed at first visit. He was- C4 v7 A4 N) D+ Z5 p7 a
using it rather frequently, twice a day. The Physicians’$ w7 K: D, f' j4 b; O: B& G2 m' Y
Desk Reference, or package insert of this product, gel or, k( [4 E4 e) f8 [) ^, J6 N% A
cream, cautions about dermal testosterone transfer to
; ^( L+ B- Y0 J8 [1 m4 m! ?unprotected females through direct skin exposure.. L$ q; V6 t2 X" E+ E
Serum testosterone level was found to be 2 times the
! F7 n# W4 H. O2 gbaseline value in those females who were exposed to
& ~% p) d) \2 h% @even 15 minutes of direct skin contact with their male' \" y+ J. N3 X: F( _# h, v" `/ W
partners.6 However, when a shirt covered the applica-0 F) D2 z$ F" w5 Y
tion site, this testosterone transfer was prevented.
6 I- \$ l6 U! z y4 k: ~6 BOur patient’s testosterone level was 60 ng/mL,
. E5 n* u9 w# [1 s$ A- C( I2 Cwhich was clearly high. Some studies suggest that$ X; W6 C. T0 j* X7 N* ~1 O) y
dermal conversion of testosterone to dihydrotestos-
M. ?4 ~" j9 pterone, which is a more potent metabolite, is more
1 i2 \( B: q m% a% \1 J- aactive in young children exposed to testosterone6 L4 ~ |8 C( ]1 s! Y& C0 P0 M
exogenously7; however, we did not measure a dihy-
: t7 v* o" a* c; x& Fdrotestosterone level in our patient. In addition to% E# r0 h1 J* m% N& L
virilization, exposure to exogenous testosterone in6 o$ A- `6 V# c
children results in an increase in growth velocity and4 t1 I8 i0 _& p
advanced bone age, as seen in our patient.
( \( P X! H; {% P7 KThe long-term effect of androgen exposure during
3 {2 P0 @4 X2 F6 ?% X4 t; V3 kearly childhood on pubertal development and final5 q$ q9 [* m/ v; ?* T/ X
adult height are not fully known and always remain
# o% w9 _7 B( {# n# d3 V* sa concern. Children treated with short-term testos-. x0 K+ o! A) c
terone injection or topical androgen may exhibit some6 v D+ }; q; D3 M# {
acceleration of the skeletal maturation; however, after; e+ p5 C0 B& u6 H, V B& A
cessation of treatment, the rate of bone maturation$ K7 f3 {& y) ]! t, f0 J
decelerates and gradually returns to normal.8,9
2 ^! X' a0 u2 u0 QThere are conflicting reports and controversy
' H2 m% U" w; D2 a4 C% [6 [0 Jover the effect of early androgen exposure on adult
7 k$ M" |# j1 Q, o( \7 S3 k' Spenile length.10,11 Some reports suggest subnormal
4 O5 X* }- T& |1 O/ ~7 G: q0 aadult penile length, apparently because of downreg-
, s" Z: \ D) Y# D& bulation of androgen receptor number.10,12 However,0 e; q$ t. c/ U. N8 K \
Sutherland et al13 did not find a correlation between7 D0 Q( U+ I' x, n; P2 H$ H9 I
childhood testosterone exposure and reduced adult3 D, `- Y( y0 T. H
penile length in clinical studies.1 m/ Y; r2 M' H% J( m
Nonetheless, we do not believe our patient is
! B8 r; f0 B& Y% R- U5 agoing to experience any of the untoward effects from3 G; K C1 ^! Y2 |
testosterone exposure as mentioned earlier because, [5 Y7 ?( t# ~' {
the exposure was not for a prolonged period of time. e) _$ F, T2 G5 j( K% j- j( Q* M
Although the bone age was advanced at the time of* p5 L. D* d- j! O A# \% q
diagnosis, the child had a normal growth velocity at
9 T- q9 f n dthe follow-up visit. It is hoped that his final adult2 v$ z4 x* Y/ \
height will not be affected.
, V; V" B# l. H" W# ~. l1 L5 J" a nAlthough rarely reported, the widespread avail-' f( j$ @, j2 w6 D4 S7 B0 h
ability of androgen products in our society may0 x2 W2 v& W8 b$ x7 c
indeed cause more virilization in male or female
p0 Y: p8 ~( Z+ M# Gchildren than one would realize. Exposure to andro-
U. F; z5 u8 x# \, ]gen products must be considered and specific ques-
1 B$ u) l6 s. M8 ?( a( ptioning about the use of a testosterone product or' I3 ^) I4 m9 Q2 E# G' I# y* U
gel should be asked of the family members during
1 P2 V- Q1 [' f2 E# D* nthe evaluation of any children who present with vir-
3 s% k) c$ t; yilization or peripheral precocious puberty. The diag-. r! h! h7 Z" o( J! n$ x# z
nosis can be established by just a few tests and by
! q7 h j* G. z' F/ R+ X1 {appropriate history. The inability to obtain such a
& L: _ i( c x) N' N2 r2 L9 G% l' t: J6 Zhistory, or failure to ask the specific questions, may
$ V, R6 B, R, p+ s! p8 s( \result in extensive, unnecessary, and expensive, q" f% t$ u& R, r
investigation. The primary care physician should be: ^6 c9 g ~& w' }9 ?, a) D: j+ [
aware of this fact, because most of these children
* Z& H! P, W; P; |7 `) nmay initially present in their practice. The Physicians’
. K' c# K2 m) a VDesk Reference and package insert should also put a1 f5 _3 _, \& E7 r5 D
warning about the virilizing effect on a male or
* a6 s6 f% s3 h" h$ I5 [, n4 n* g: a9 \8 afemale child who might come in contact with some-
3 P: a$ B4 {7 Uone using any of these products.
0 Q) ]! ?2 H8 @1 q7 G4 M* nReferences
- |! v D N# N' S0 y- L1. Styne DM. The testes: disorder of sexual differentiation
* x, \3 Z- q/ n6 o1 z" l9 D7 Zand puberty in the male. In: Sperling MA, ed. Pediatric9 w* U9 k8 B& W8 C. t, h
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;# w5 [9 e: O) C! d
2002: 565-628.
; n0 P/ x4 s+ G) s( |* d& S' z2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
4 U& c% f/ Z. T/ a. ]puberty in children with tumours of the suprasellar pineal" i+ }, r; L- Y" s+ [% j
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from; ~) j2 M, g3 ^* y7 W$ _6 O
Topical Testosterone Exposure / Bhowmick et al 5432 B7 r/ \" v3 I/ P) C& r& S
areas: organic central precocious puberty. Acta Paediatr.+ Q3 T0 `7 I3 X4 e$ p7 a8 F K
2001;90:751-756.
/ T Z5 Y: I# w' n0 C3 a1 ?5 J3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
/ D1 f" a5 V" D) UPediatric Endocrinology. 4th ed. New York, NY: Marcel( g5 P9 } R! e5 E1 v2 J
Dekker Inc; 2003:211-238.' b4 O- ^1 M2 A' {
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual; ?0 ]2 G8 i: ^$ C8 g9 y* L+ `. ]7 W5 y
development in a two-year-old boy induced by topical
1 ^+ @# e9 N L( f1 D& Qexposure to testosterone. Pediatrics. 1999;104:e23.
9 }* ]8 n; ]4 d7 w5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
2 ^6 L" l# v, [Skeletal Development of the Hand and Wrist. 2nd ed.0 }# J1 S6 Q3 w d+ ~. @
Stanford, CA: Stanford University Press; 1959.
9 b9 o7 E4 H! r6 k! v6. Physicians’ Desk Reference. Androgel 1% testosterone,
2 p4 n0 Y. Z: ^2 LUnimed Pharmaceutical Inc. Montvale, NJ: Medical
6 l% `4 B4 t8 m6 u* i* AEconomics Company, Inc; 2004:3239-3241.: o% ?' n2 T2 k: n2 h( k( u+ P
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